Drainage system of high-pressure heater

Abstract

The utility model belongs to the technical field of thermal power generation, and discloses a drainage system of a high-pressure heater. The pressurizing pipeline is communicated between the input end of the high-pressure heating set and the output end of the medium-pressure heating set, part of drained water at the inlet end of the high-pressure heating set can flow back to the output end of the medium-pressure heating set through the pressurizing pipeline, and redundant drained water flows back to the water supply pipeline to be collected. The pressure when the drain water flows back to the water supply pipeline is guaranteed, the pressure loss of the backflow drain water is reduced, under the action of the water supply pump, part of the backflow drain water and the drain water in the original water supply pipeline can be continuously supplied to the high-pressure heating set together, and therefore circulation of the redundant drain water at the input end of the high-pressure heating set is achieved. Excess drain water is prevented from flowing back to the front end of the medium-pressure heating set or the first booster pump, energy loss of drain water backflow and energy consumption of multiple times of pressurization and heating are reduced, and economic benefits of the drain system are improved.

Description

Technical Field

[0001] This utility model relates to the field of thermal power generation technology, and in particular to a condensate drainage system for a high-pressure heater. Background Technology

[0002] The construction of a new power system primarily based on new energy sources is an important means to achieve dual-carbon goals. In the future, as a large amount of renewable energy is connected to the grid, thermal power units will play a greater role as base load and peak load in the new power system in order to absorb the generated electricity from new energy sources, requiring them to have the ability to significantly regulate loads.

[0003] During base load and peak load operations, thermal power units adjust the condensate pressure entering the unit via the high-pressure cylinder regulating valve. When the unit's extraction steam pressure decreases, the high-pressure cylinder output water pressure decreases, preventing some condensate from entering the unit. In traditional condensate systems, some condensate that cannot enter the unit flows back to the deaerator or condenser, increasing pump power consumption and causing thermal displacement in the thermal system, increasing cooling losses and reducing the unit's economic efficiency.

[0004] Therefore, there is an urgent need for a condensate drainage system for high-pressure heaters to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a condensate drainage system for a high-pressure heater, which can return excess condensate from the input end of the high-pressure heating unit, reduce energy loss in the condensate drainage system, and improve economic efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A condensate drainage system for a high-pressure heater is provided, comprising:

[0008] A water supply pipeline, wherein a first pre-pump, a medium-pressure heating group, a water supply pump and a high-pressure heating group are sequentially installed on the water supply pipeline;

[0009] A booster pipeline is provided, with its inlet end connected to the input end of the high-pressure heating group and its outlet end connected to the output end of the medium-pressure heating group. A booster pump is installed on the booster pipeline.

[0010] As an alternative to the condensate drainage system of the high-pressure heater, a first regulating valve is also provided on the booster pipeline, which is located at the rear end of the booster pump.

[0011] As an alternative to the condensate drainage system of the high-pressure heater, several first isolation valves are also installed on the pressurization pipeline.

[0012] As an alternative to the condensate drainage system of the high-pressure heater, at least one of the first isolation valves is disposed at the rear end of the booster pump. The condensate drainage system also includes a circulation pipeline, one end of which is connected to the input end of the high-pressure heating group, and the other end is connected to the booster pipeline and located between the rear end of the booster pump and the first isolation valve.

[0013] As an optional solution for the condensate drainage system of the high-pressure heater, the circulation pipeline is also equipped with a second regulating valve and several second isolation valves.

[0014] As an optional solution for the condensate drainage system of the high-pressure heater, the condensate drainage system further includes a first pressure-holding pipeline, one end of which is connected to the input end of the high-pressure heating group and the other end of which is connected to the output end of the medium-pressure heating group. A third regulating valve and several third isolation valves are provided on the pressure-holding pipeline.

[0015] As an alternative to the condensate drainage system for the high-pressure heater, the medium-pressure heating group includes a first medium-pressure heater and a second medium-pressure heater. The condensate drainage system also includes a second pre-pump, which is connected to the water supply pipeline and located between the first medium-pressure heater and the second medium-pressure heater.

[0016] As an optional solution for the condensate drainage system of the high-pressure heater, the condensate drainage system further includes a second pressure-holding pipeline, one end of which is connected to the input end of the high-pressure heating group, and the other end of which is connected to the front end of the second pre-pump.

[0017] As an alternative to the condensate drainage system of the high-pressure heater, a fourth regulating valve and several fourth isolation valves are installed on the second pressure-holding pipeline.

[0018] As an alternative to the condensate drainage system of the high-pressure heater, the water supply pipeline is connected to the deaerator at its front end.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a condensate drainage system for a high-pressure heater. In the water supply pipeline, a first pre-pump and a water supply pump pressurize the medium-pressure heating group and the high-pressure heating group respectively, ensuring a gradual increase in water pressure. A booster pipeline connects the input end of the high-pressure heating group and the output end of the medium-pressure heating group. When some condensate cannot be output from the inlet end of the high-pressure heating group, this condensate can flow back to the output end of the medium-pressure heating group, i.e., the front end of the water supply pump, through the booster pipeline. This allows excess condensate to be collected back into the water supply pipeline. A booster pump is installed on the booster pipeline to ensure the pressure when the condensate flows back into the water supply pipeline, reducing pressure loss during return. Under the action of the water supply pump, the returned condensate, along with the condensate in the original water supply pipeline, can be continuously supplied to the high-pressure heating group. This achieves circulation of excess condensate at the input end of the high-pressure heating group, preventing excess condensate from flowing back to the medium-pressure heating group or the front end of the first pre-pump, reducing energy loss from condensate return and energy consumption from multiple pressurization heating processes, and improving the economic efficiency of the condensate drainage system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the hydrophobic system of the high-pressure heater provided by this utility model;

[0022] Figure 2 This is a partial schematic diagram of the hydrophobic system of the high-pressure heater provided by this utility model.

[0023] In the picture:

[0024] 100. Water supply pipeline; 110. First pre-pump; 120. Medium-pressure heating group; 121. First medium-pressure heater; 122. Second medium-pressure heater; 123. Third medium-pressure heater; 130. Water supply pump; 140. High-pressure heating group; 150. Second pre-pump; 160. Deaerator;

[0025] 200, Booster pipeline; 210, Booster pump; 220, First regulating valve; 230, First isolation valve;

[0026] 300. Circulation pipeline; 310. Second regulating valve; 320. Second isolation valve;

[0027] 400. First pressure-holding pipeline; 410. Third regulating valve; 420. Third isolation valve;

[0028] 500. Second pressure-holding pipeline; 510. Fourth regulating valve; 520. Fourth isolation valve;

[0029] 600. Return pipeline. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] like Figures 1 to 2 As shown, the condensate drainage system of the high-pressure heater in this embodiment includes a water supply pipeline 100 and a booster pipeline 200. A first pre-pump 110, a medium-pressure heating group 120, a water supply pump 130, and a high-pressure heating group 140 are sequentially installed on the water supply pipeline 100. The inlet end of the booster pipeline 200 is connected to the input end of the high-pressure heating group 140, and the outlet end of the booster pipeline 200 is connected to the output end of the medium-pressure heating group 120. A booster pump 210 is installed on the booster pipeline 200.

[0035] Based on the above design, the high-pressure heater drainage system provided by this utility model, in the water supply pipeline 100, the first pre-pump 110 and the water supply pump 130 can respectively pressurize the medium-pressure heating group 120 and the high-pressure heating group 140, ensuring that the water pressure in the water supply pipeline 100 gradually increases. The booster pipeline 200 is connected between the input end of the high-pressure heating group 140 and the output end of the medium-pressure heating group 120. When some drainage cannot be output from the inlet end of the high-pressure heating group 140, this drainage can flow back to the output end of the medium-pressure heating group 120 through the booster pipeline 200, that is, back to the front end of the water supply pump 130, realizing excess drainage. The system collects and collects the condensate back, and a booster pump 210 is installed on the booster pipeline 200 to ensure stable pressure when the condensate returns to the water supply pipeline 100, reducing pressure loss of the condensate. Under the action of the water supply pump 130, the condensate back and the condensate in the original water supply pipeline 100 can be continuously supplied to the high-pressure heating group 140, thereby realizing the circulation of excess condensate at the input end of the high-pressure heating group 140, avoiding excess condensate from flowing back to the front end of the medium-pressure heating group 120 or the front end of the first pre-pump 110, reducing energy loss from condensate backflow and energy consumption from multiple pressurization and heating, and improving the economic efficiency of the condensate system.

[0036] In this embodiment, the front end of the water supply pipeline 100 is connected to the deaerator 160. The deaerator 160 can store a certain amount of water supply to alleviate the problem of unstable water supply flow, and can also separate and discharge oxygen and other gases (such as carbon dioxide) in the water supply to prevent these gases from corroding the pipeline, thereby extending the service life of the pipeline.

[0037] The first pre-pump 110 is located at the rear end of the deaerator 160 and is used to pressurize the condensate flowing out of the deaerator 160 to ensure stable pressure when the condensate enters the medium-pressure heating group 120. Optionally, the medium-pressure heating group 120 includes multiple medium-pressure heaters to achieve multiple medium-pressure heating of the condensate. In this embodiment, the medium-pressure heating group 120 includes three medium-pressure heaters, namely a first medium-pressure heater 121, a second medium-pressure heater 122, and a third medium-pressure heater 123, which are arranged sequentially along the condensate flow direction of the water supply pipeline 100. Of course, the number of medium-pressure heaters can also be set to two, four, etc., and can be adjusted according to usage requirements.

[0038] To ensure the stability of the condensate pressure during the heating process of the medium-pressure heating group 120, a second pre-pump 150 is also installed on the water supply pipeline 100. The second pre-pump 150 is located between the first medium-pressure heater 121 and the second medium-pressure heater 122. The second pre-pump 150 can be set at the front end or the rear end of the third medium-pressure heater 123 to ensure that the condensate can be pressurized multiple times during multiple heating processes, thereby reducing the pressure loss of the condensate.

[0039] After the condensate flows out from the medium-pressure heating group 120, it flows to the high-pressure heating group 140 under the action of the water supply pump 130. Optionally, the high-pressure heating group 140 is equipped with multiple high-pressure heaters to realize multiple high-pressure heating of the condensate. For example, there may be two, three, four, etc., high-pressure heaters.

[0040] When the condensate from the input end of the high-pressure heating unit 140 flows into the booster pipe 200, a first regulating valve 220 is installed on the booster pipe 200 to ensure a stable condensate flow rate pressurized by the booster pump 210. The first regulating valve 220 is located at the rear end of the booster pump 210. By adjusting the opening of the first regulating valve 220, the condensate flow rate output from the booster pipe 200 can be kept stable.

[0041] Optionally, the booster pipeline 200 is further equipped with several first isolation valves 230. When condensate return is required at the input end of the high-pressure heating group 140, the first isolation valves 230 are opened to maintain the flow in the booster pipeline 200. When condensate return is not required for the high-pressure heating group 140, the first isolation valves 230 are closed to shut off the booster pipeline 200, preventing the diversion of the booster pipeline from affecting the water pressure at the input end of the high-pressure heating group 140. In this embodiment, one or more first isolation valves 230 can be provided. When multiple first isolation valves 230 are provided, they can include manual isolation valves and electric isolation valves. The manual isolation valve is in a normally open state, and the opening and closing of the booster pipeline 200 is controlled by the electric isolation valve. When maintenance and repair of the booster pipeline 200 are required, the manual isolation valve is used to close the booster pipeline 200 because the electric isolation valve has poor sealing performance, ensuring that the booster pipeline 200 is in a good closed state.

[0042] In some embodiments, at least one first isolation valve 230 is disposed at the rear end of the booster pump 210, and the drainage system further includes a circulation pipeline 300, one end of which is connected to the input end of the high-pressure heating group 140, and the other end is connected to the booster pipeline 200 and located between the rear end of the booster pump 210 and the first isolation valve 230.

[0043] When the first isolation valve 230 located at the rear end of the booster pump 210 is closed, the booster pipeline 200 is also closed. At this time, the booster pump 210 needs to be shut down to prevent it from continuously operating and increasing the pressure within the booster pipeline 200. By setting up a circulation pipeline 300, the condensate from the output end of the booster pump 210 can be circulated to the input end of the high-pressure heating group 140 without shutting down or running at low speed, thereby avoiding energy waste caused by frequent start-stop of the booster pump 210.

[0044] Optionally, the circulation pipeline 300 is further provided with a second regulating valve 310 and several second isolation valves 320. By adjusting the opening degree of the second regulating valve 310, the flow rate in the circulation pipeline 300 is adjusted to ensure the stability of the condensate flow rate in the circulation pipeline 300; the circulation pipeline 300 is switched on and off by the switching of the second isolation valves 320. For example, the several second isolation valves 320 can be set with reference to the several first isolation valves 230, which will not be described in detail here.

[0045] In some embodiments, the drainage system further includes a first pressure-holding pipeline 400, one end of which is connected to the input end of the high-pressure heating group 140, and the other end is connected to the output end of the medium-pressure heating group 120. A third regulating valve 410 and several third isolation valves 420 are provided on the first pressure-holding pipeline 400. When the booster pump 210 is in the off state, some drainage flows through the first pressure-holding pipeline 400 between the input end of the high-pressure heating group 140 and the output end of the medium-pressure heating group 120. The third regulating valve 410 ensures stable flow within the first pressure-holding pipeline 400, thereby ensuring stable flow at the input end of the high-pressure heating group 140. The several third isolation valves 420 are used to control the opening and closing of the first pressure-holding pipeline 400, and can be configured similarly to the several first isolation valves 230, which will not be described further here.

[0046] Furthermore, the drainage system also includes a second pressure-holding pipeline 500, one end of which is connected to the input end of the high-pressure heating unit 140, and the other end is connected to the front end of the second pre-pump 150. When the booster pump 210 malfunctions and cannot operate, the condensate at the input end of the high-pressure heating unit 140 can flow back through the second pressure-holding pipeline 500. The returned condensate is then pressurized by the second pre-pump 150 and the feed water pump 130 in sequence, reducing the pressure loss caused by the backflow and providing a safety guarantee for the maintenance and repair of the booster pump 210.

[0047] It is understandable that a fourth regulating valve 510 and several fourth isolation valves 520 are installed on the second pressure-holding pipeline 500. The fourth regulating valve 510 is used to control the flow rate of the second pressure-holding pipeline 500 to ensure the stability of the condensate flow rate in the second pressure-holding pipeline 500. The several fourth isolation valves 520 are used to control the opening and closing of the second pressure-holding pipeline 500. They can be set up with reference to the several first isolation valves 230, and will not be described in detail here.

[0048] Furthermore, to ensure the safety of the water supply pipeline 100, the drainage system is also equipped with multiple return pipelines 600. On the water supply pipeline 100, a return pipeline 600 is connected between every two adjacent components. For example, in this embodiment, return pipelines 600 are provided between the deaerator 160 and the first medium-pressure heater 121, between the first medium-pressure heater 121 and the third medium-pressure heater 123, between the third medium-pressure heater 123 and the second medium-pressure heater 122, and between the second medium-pressure heater 122 and the high-pressure heating group 140, to ensure that excess drainage is returned step by step, thus ensuring the safety of the drainage system.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A drain system for a high pressure heater, characterized by, The application relates to a drain water system. The drain water system comprises a feed water pipeline (100), a booster pipeline (200), a circulating pipeline (300), a first pressure maintaining pipeline (400) and a second pressure maintaining pipeline (500). The first pre-pump (110), the medium-pressure heating group (120), the feed water pump (130) and the high-pressure heating group (140) are sequentially arranged on the feed water pipeline (100).

2. The drain system of a high-pressure heater according to claim 1, wherein The inlet end of the booster pipeline (200) is communicated with the input end of the high-pressure heating group (140), the outlet end of the booster pipeline (200) is communicated with the output end of the medium-pressure heating group (120), and the booster pump (210) is arranged on the booster pipeline (200).

3. The drain system of a high-pressure heater according to claim 1, wherein The first regulating valve (220) is further arranged on the booster pipeline (200) and located at the rear end of the booster pump (210).

4. The drain system of a high-pressure heater according to claim 3, wherein A plurality of first isolation valves (230) are further arranged on the booster pipeline (200).

5. The drain system of a high-pressure heater according to claim 4, wherein At least one first isolation valve (230) is arranged at the rear end of the booster pump (210), and the drain water system further comprises the circulating pipeline (300), one end of the circulating pipeline (300) is communicated with the input end of the high-pressure heating group (140), and the other end is communicated with the booster pipeline (200) and located between the rear end of the booster pump (210) and the first isolation valve (230).

6. The drain system of a high-pressure heater according to claim 1, wherein The second regulating valve (310) and a plurality of second isolation valves (320) are further arranged on the circulating pipeline (300).

7. The high pressure heater hydrophobic system of claim 1 wherein, The drain water system further comprises the first pressure maintaining pipeline (400), one end of the first pressure maintaining pipeline (400) is communicated with the input end of the high-pressure heating group (140), and the other end is communicated with the output end of the medium-pressure heating group (120), the third regulating valve (410) and a plurality of third isolation valves (420) are arranged on the first pressure maintaining pipeline (400).

8. The drain system of a high-pressure heater according to claim 7, wherein The medium-pressure heating group (120) comprises a first medium-pressure heater (121) and a second medium-pressure heater (122), and the second pre-pump (150) is further arranged on the feed water pipeline (100) and located between the first medium-pressure heater (121) and the second medium-pressure heater (122).

9. The drain system of a high-pressure heater according to claim 8, wherein The drain water system further comprises the second pressure maintaining pipeline (500), one end of the second pressure maintaining pipeline (500) is communicated with the input end of the high-pressure heating group (140), and the other end is communicated with the front end of the second pre-pump (150).

10. The high pressure heater hydrophobic system of claim 1, wherein, The fourth regulating valve (510) and a plurality of fourth isolation valves (520) are arranged on the second pressure maintaining pipeline (500). The front end of the feed water pipeline (100) is communicated with the deaerator (160).

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