Feed water adjusting system

Abstract

The utility model provides a feed water adjusting system, and relates to the field of thermal power generating units. The water supply adjusting system comprises a water supply main path and a water supply adjusting bypass. Wherein a water inlet of the water supply adjusting bypass is communicated with the water supply port and is communicated with a water inlet of the water supply main path through a branch water pipeline and a three-way valve, and a water outlet of the water supply adjusting bypass is communicated with the water drainage port; a water outlet of the water supply main path is communicated with a water inlet of a high-pressure heater of the thermal power generating unit; a water outlet of the high-pressure heater is communicated with the water outlet; an adjusting assembly is arranged on the water supply adjusting bypass; in the using state, the water supply flow of the water supply adjusting bypass is adjusted through the adjusting assembly to control the water supply flow of the water supply main path, and therefore the load response rate of the thermal power generating unit is adjusted. The adjusting function of the water supply system is achieved, the unit load response rate can be adjusted in real time by adjusting the flow of the water supply system according to requirements, the adjusting effect is good, operation is easy, the maintenance cost is low, and meanwhile safe operation of the unit is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of thermal power units, and particularly to a feed water regulation system. Background Art

[0002] In recent years, with the rapid growth of the installed capacity of new energy power such as wind power and photovoltaic power, new energy such as wind power and photovoltaic power provides us with a large amount of clean power. The regulation ability of the power system is difficult to fully meet the requirements of the large-scale development and consumption of new energy. To better absorb and consume new energy, it is necessary to improve the response rate of existing thermal power units. At present, the load response rate of conventional thermal power units is less than 4MW / min, that is, about 1%, and it is extremely difficult to achieve the flexibility transformation goal only by optimizing the use of boiler energy storage through the coordinated control system. Therefore, it is necessary to take auxiliary measures to improve the load change ability of the unit. According to the current grid requirements, the response rate of the unit needs to reach 2% - 3%, that is, 6.6MW / min - 9.9MW / min; the feed water system connects the two main engines of the steam turbine and the boiler, and realizes the unit load response rate by adjusting the flow rate of the feed water system, which is an important means to achieve the improvement rate. The existing feed water system lacks a regulation function, or uses a feed water bypass valve for temporary regulation. However, at the beginning of the design of the feed water bypass valve, its main function is that when the high-pressure heater fails and stops operating, the feed water all passes through the bypass pipeline, playing a cut-off role. Using the feed water bypass valve for regulation not only has a poor regulation effect, but also easily causes leakage of the bypass valve, posing a safety hazard and affecting the economy of the normal operation of the unit. Content of the Utility Model

[0003] The utility model provides a feed water regulation system, which solves the problems that the existing feed water system lacks a regulation function, cannot regulate the unit load response rate by adjusting the flow rate of the feed water system, and has a poor regulation effect and potential safety hazards.

[0004] To solve the above technical problems, the technical solution of the utility model is as follows:

[0005] An embodiment of the utility model provides a feed water regulation system, including:

[0006] A main feed water path and a feed water regulation bypass;

[0007] Wherein, the water inlet of the feed water regulation bypass is communicated with the water supply port, and is communicated with the water inlet of the main feed water path through a branch water pipe and a three-way valve. The water outlet of the feed water regulation bypass is communicated with the drain port;

[0008] The water outlet of the main feed water path is communicated with the water inlet of the high-pressure heater of the thermal power unit, and the water outlet of the high-pressure heater is communicated with the drain port;

[0009] A regulating component is arranged on the feed water regulation bypass;

[0010] During the use state, the feed water flow rate of the feed water regulating bypass is adjusted through the regulating component to control the feed water flow rate of the main feed water path, thereby adjusting the load response rate of the thermal power unit.

[0011] Optionally, the feed water regulating system further includes:

[0012] A high-pressure feed water bypass, the water inlet of the high-pressure feed water bypass is connected to the three-way valve, and the water outlet of the high-pressure feed water bypass is connected to the drain outlet.

[0013] Optionally, the feed water regulating system further includes:

[0014] A high-pressure feed water bypass electric valve arranged at the water outlet of the high-pressure heater.

[0015] Optionally, the regulating component includes:

[0016] A pneumatic regulating valve for the feed water regulating bypass, which is arranged on the feed water regulating bypass and is located at the water outlet end of the feed water regulating bypass.

[0017] Optionally, the regulating component further includes:

[0018] A gate valve and an electric gate valve for the feed water regulating bypass, which are arranged on the feed water regulating bypass and are located on both sides of the pneumatic regulating valve for the feed water regulating bypass.

[0019] Optionally, the regulating component further includes:

[0020] A flow measurement device arranged on the feed water regulating bypass and located at the water inlet end of the feed water regulating bypass.

[0021] Optionally, the maximum water supply flow rate of the water supply port is 1025 tons per hour, and the regulating flow rate of the feed water regulating bypass is 530 tons per hour.

[0022] The above solution of the present utility model has at least the following beneficial effects:

[0023] The feed water regulation system described in the present utility model includes: a main feed water path and a bypass feed water regulation path; wherein, the water inlet of the bypass feed water regulation path is communicated with the water supply port, and is communicated with the water inlet of the main feed water path through a branch water pipeline and a three-way valve. The water outlet of the bypass feed water regulation path is communicated with the drain port; the water outlet of the main feed water path is communicated with the water inlet of the high-pressure heater of the thermal power unit, and the water outlet of the high-pressure heater is communicated with the drain port; a regulating component is arranged on the bypass feed water regulation path; in the use state, the feed water flow rate of the bypass feed water regulation path is regulated through the regulating component to control the feed water flow rate of the main feed water path, thereby regulating the load response rate of the thermal power unit. The regulating function of the feed water system is realized, and the load response rate of the unit can be regulated in real time by regulating the feed water system flow rate according to requirements. Moreover, the regulating effect is good, the operation is simple, the maintenance cost is low, and the safe operation of the unit is ensured at the same time. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the feed water regulation system of the present utility model;

[0025] Description of the Reference Numerals:

[0026] 1, main feed water path; 11, high-pressure heater; 2, three-way valve; 3, electric valve of high-pressure feed water bypass; 4, high-pressure feed water bypass; 5, flow measurement device; 6, gate valve of bypass feed water regulation; 7, pneumatic regulating valve of bypass feed water regulation; 8, electric gate valve of bypass feed water regulation; 9, bypass feed water regulation path; 91, branch water pipeline; 10, water supply port; 100, drain port. Detailed Embodiment

[0027] Hereinafter, exemplary embodiments of the present utility model will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided so that the present utility model can be more thoroughly understood and the scope of the present utility model can be fully communicated to those skilled in the art.

[0028] As Figure 1 shown, an embodiment of the present utility model provides a feed water regulation system, including:

[0029] a main feed water path 1 and a bypass feed water regulation path 9;

[0030] Wherein, the water inlet of the bypass feed water regulation path 9 is communicated with the water supply port 10, and is communicated with the water inlet of the main feed water path 1 through a branch water pipeline 91 and a three-way valve 2. The water outlet of the bypass feed water regulation path 9 is communicated with the drain port 100;

[0031] The water outlet of the main water supply path 1 is communicated with the water inlet of the high-pressure heater 11 of the thermal power unit, and the water outlet of the high-pressure heater 11 is communicated with the drain port 100;

[0032] An adjusting component is provided on the water supply adjusting bypass 9;

[0033] In the use state, the water supply flow of the water supply adjusting bypass 9 is adjusted through the adjusting component to control the water supply flow of the main water supply path 1, so as to adjust the load response rate of the thermal power unit.

[0034] The maximum water supply flow of the water supply port 10 is 1025 tons per hour, and the adjusting flow of the water supply adjusting bypass 9 is 530 tons per hour.

[0035] In this embodiment, the water supply adjusting system can be connected to multiple high-pressure heaters 11 at the same time. When there are multiple high-pressure heaters 11, the water inlets and outlets of the high-pressure heaters 11 are connected in series with each other, and then are respectively communicated with the water inlet and the drain port 100 of the main water supply path 1; the three-way valve 2 is mainly used to open or close the main water supply path 1; the water supply adjusting system is mainly applied to a thermal power unit, and mainly realizes the adjustment of the load response rate of the thermal power unit by adjusting the water supply flow of the main water supply path 1; the specific adjustment process is as follows: when the water supply port 10 conducts high-pressure water supply, the water supply flow of the water supply adjusting bypass 9 can be increased through the adjusting component, so as to reduce the water supply flow of the main water supply path 1, thereby reducing the extraction steam volume of the high-pressure heater 11 and increasing the steam volume for the steam turbine to do work, thereby increasing the electric load of the thermal power unit; at the same time, the water supply flow of the water supply adjusting bypass 9 can also be reduced through the adjusting component, so as to increase the water supply flow of the main water supply path 1, thereby increasing the extraction steam volume of the high-pressure heater and reducing the steam volume for the steam turbine to do work, and reducing the electric load of the unit; through the water supply adjusting system of the present utility model, the load rising and falling speed of the unit can be increased, and the requirement of the power grid for adjusting the load can be better met; the problem that the existing water supply system lacks an adjusting function, cannot adjust the load response rate of the unit by adjusting the water supply system flow, and has a poor adjusting effect and potential safety hazards is solved; the adjusting function of the water supply system is realized, and the load response rate of the unit can be adjusted in real time by adjusting the water supply system flow according to requirements, and the adjusting effect is good, the operation is simple, and the maintenance cost is low.

[0036] In an optional embodiment of the present utility model, the water supply adjusting system further includes:

[0037] A high-pressure water supply bypass 4, the water inlet of the high-pressure water supply bypass 4 is communicated with the three-way valve 2, and the water outlet of the high-pressure water supply bypass 4 is communicated with the drain port 100.

[0038] A high-pressure water supply bypass electric valve 3 provided at the water outlet of the high-pressure heater 11.

[0039] In this embodiment, the high-pressure feed water bypass 4 is closed by a three-way valve 2 under normal conditions. The design of the high-pressure feed water bypass 4 is mainly used to divert the feed water in the main feed water path 1 to the high-pressure feed water bypass 4 in time when an accident occurs in the high-pressure heater 11, and discharge it through the high-pressure feed water bypass 4, so as to facilitate the maintenance of the high-pressure heater 11. At the same time, the high-pressure heater 11 can be shut down, but the thermal power unit can still operate normally. Specifically, when an accident occurs in the high-pressure heater 11, the electric valve 3 of the high-pressure feed water bypass is closed, and the water inlet of the main feed water path 1 is closed by adjusting the three-way valve 2, and the water inlet of the high-pressure feed water bypass 4 is opened, so that the feed water at the water supply port 10 is discharged through the high-pressure feed water bypass 4. In this embodiment, through the design of the high-pressure feed water bypass 4, the functions of independent operation of the accident and regulating the two high-pressure feed water bypass pipelines are realized, and they can operate independently without affecting each other, preventing the leakage and other fault problems that are likely to occur due to the frequent use of the high-pressure feed water bypass electric valve 3 on the high-pressure feed water bypass 4, thus ensuring the safety of the feed water regulation system and the stable operation of the system. At the same time, because the cost of the high-pressure feed water bypass electric valve 3 is high, this design can extend the service life of the high-pressure feed water bypass electric valve 3, thus effectively reducing the maintenance cost.

[0040] In an alternative embodiment of the present utility model, the adjustment assembly includes:

[0041] A pneumatic control valve 7 for the feed water regulating bypass, which is arranged on the feed water regulating bypass 9 and is located at the outlet end of the feed water regulating bypass 9.

[0042] A flow measurement device 5 for the feed water regulating bypass, which is arranged on the feed water regulating bypass 9 and is located at the inlet end of the feed water regulating bypass 9.

[0043] In this embodiment, the flow measurement device 5 is mainly used to monitor the flow rate at the water inlet of the feed water regulating bypass 9. The pneumatic control valve 7 for the feed water regulating bypass is mainly used to adjust the feed water flow rate of the feed water regulating bypass 9, so as to adjust the feed water flow rate of the main feed water path 1, adjust the extraction steam volume of the high-pressure heater 11, and further adjust the steam volume for the steam turbine to do work, thereby changing the electric load of the thermal power unit and improving the response rate of the generator set.

[0044] In an alternative embodiment of the present utility model, the adjustment assembly further includes:

[0045] A gate valve 6 for the feed water regulating bypass and an electric gate valve 8 for the feed water regulating bypass, which are arranged on the feed water regulating bypass 9 and are located on both sides of the pneumatic control valve 7 for the feed water regulating bypass.

[0046] In this embodiment, the feed water regulating bypass gate valve 6 and the feed water regulating bypass motorized gate valve 8 are mainly used for the maintenance of the feed water regulating bypass pneumatic control valve 7. When the feed water regulating bypass pneumatic control valve 7 fails, the maintenance of the feed water regulating bypass pneumatic control valve 7 can be achieved by closing the feed water regulating bypass gate valve 6 and the feed water regulating bypass motorized gate valve 8.

[0047] The working process of the present utility model is specifically as follows:

[0048] During use, first, it is necessary to open the high-pressure feed water bypass motorized valve 3, the feed water regulating bypass gate valve 6, and the feed water regulating bypass motorized gate valve 8, and open the water inlet of the feed water main path 1 through the three-way valve 2, and close the water inlet of the high-pressure feed water bypass 4; then the water supply port 10 starts to supply feed water to the high-pressure heater. After the water supply, it flows into the high-pressure heater 11 through the water inlet of the feed water main path 1, and then is discharged through the drain port 100 communicated with the water outlet of the high-pressure heater 11; during the use process, when it is necessary to adjust the load response rate of the thermal power unit, the load response rate of the thermal power unit can be adjusted by adjusting the water flow rate in the feed water regulating bypass 9 through the feed water regulating bypass pneumatic control valve 7; when a failure occurs in the high-pressure heater 11, in order to ensure that the thermal power unit can still operate normally and facilitate the maintenance of the high-pressure heater 11, it is only necessary to close the high-pressure feed water bypass motorized valve 3, and close the water inlet of the feed water main path 1 by adjusting the three-way valve 2, and open the water inlet of the high-pressure feed water bypass 4, so that the feed water from the water supply port 10 can be discharged through the high-pressure feed water bypass 4.

[0049] The feed water regulating system described in the present utility model can meet the current grid's regulation requirements for thermal power units through the design of the feed water regulating bypass 9. When the maximum water supply flow rate of the water supply port 10 is 1025 tons per hour and the regulating flow rate of the feed water regulating bypass 9 is 530 tons per hour, the response rate of the thermal power unit can reach 2% - 3%. After adopting this system, the load response time of the unit can be advanced by 1.39 - 2.19 min; the response ability of the unit is significantly improved, and the regulating pipeline and the accident pipeline are independently designed, ensuring the safety of the feed water regulating system and the stable operation of the system; improving the regulating accuracy and performance, perfecting the relevant protection logic, so as to realize the variable load regulating ability of the unit.

[0050] The above is the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle described in the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A water supply regulation system, characterized in that, Comprising: The main feed water path (1) and the feed water regulating bypass path (9); Among them, the water inlet of the feed water regulating bypass path (9) is communicated with the water supply port (10), and is communicated with the water inlet of the main feed water path (1) through the branch water pipe (91) and the three-way valve (2), and the water outlet of the feed water regulating bypass path (9) is communicated with the drain port (100); The water outlet of the main feed water path (1) is communicated with the water inlet of the high-pressure heater (11) of the thermal power unit, and the water outlet of the high-pressure heater (11) is communicated with the drain port (100); A regulating assembly is provided on the feed water regulating bypass path (9); In the use state, the feed water flow rate of the feed water regulating bypass path (9) is adjusted through the regulating assembly to control the feed water flow rate of the main feed water path (1), thereby adjusting the load response rate of the thermal power unit.

2. The feed water regulating system according to claim 1, characterized in that Further comprising: The high-pressure feed water bypass path (4), the water inlet of the high-pressure feed water bypass path (4) is communicated with the three-way valve (2), and the water outlet of the high-pressure feed water bypass path (4) is communicated with the drain port (100).

3. The feed water regulating system according to claim 1, characterized in that, Further comprising: The high-pressure feed water bypass electric valve (3) provided at the water outlet of the high-pressure heater (11).

4. The water supply regulation system according to claim 1, characterized in that, The regulating assembly includes: The feed water regulating bypass pneumatic control valve (7) provided on the feed water regulating bypass path (9) and located at the water outlet end of the feed water regulating bypass path (9).

5. The feed water regulating system according to claim 4, characterized in that, The regulating assembly further includes: The feed water regulating bypass gate valve (6) and the feed water regulating bypass electric gate valve (8) provided on the feed water regulating bypass path (9) and located on both sides of the feed water regulating bypass pneumatic control valve (7).

6. The feed water regulating system according to claim 1, characterized in that, The regulating assembly further includes: The flow measuring device (5) provided on the feed water regulating bypass path (9) and located at the water inlet end of the feed water regulating bypass path (9).

7. The feed water regulating system according to claim 1, characterized in that, The maximum water supply flow rate of the water supply port (10) is 1025 tons per hour, and the regulating flow rate of the feed water regulating bypass path (9) is 530 tons per hour.

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