Electric heating system applied to back pressure unit

Abstract

The utility model belongs to the field of heat supply and power supply of cogeneration steam turbine units, and relates to an electric heating system applied to a back pressure unit. Comprising a backpressure turboset which is connected with a condensate pump, and the condensate pump is connected with an electrode steam boiler through a condensate supply pipeline main path and a condensate supply pipeline bypass. A condensation water main path valve is arranged on the condensation water supply pipeline main path; a variable-rotating-speed booster pump is arranged on a condensed water supply pipeline bypass, a condensed water bypass outlet valve is arranged between the variable-rotating-speed booster pump and the condensed water pump, and a booster pump outlet valve is arranged between the variable-rotating-speed booster pump and the electrode steam boiler. According to the utility model, the industrial steam supply capacity and the heating steam utilization capacity of the back pressure unit can be guaranteed to the maximum extent, the industrial steam supply capacity of the back pressure unit is exerted, and required steam supply parameters can be flexibly matched.

Description

Technical Field

[0001] The utility model belongs to the field of heat and power supply of a cogeneration steam turbine unit, and relates to an electric heating system applied to a back pressure unit. Background Art

[0002] As an advanced way of energy utilization, cogeneration significantly reduces the loss of cold sources, thereby maximizing the use of energy. This technology not only improves the efficiency of energy use, but is also a very effective means of energy conservation and consumption reduction, which has far-reaching significance for promoting sustainable development and green energy transformation. Among the various applications of cogeneration, the method of heating the circulating water of the heat network with the exhaust steam of the back pressure unit is particularly eye-catching. This method almost completely eliminates the loss of cold sources and makes full use of energy. Especially in small units, back pressure units have been widely used due to their high efficiency and energy-saving characteristics. They not only undertake the important task of heating local residents, but also provide a stable and reliable heat source for the city's heating system.

[0003] However, it is worth noting that most back-pressure units only provide external heating in winter to achieve residential heating. Generally speaking, industrial steam supply parameters are much larger than residential heating steam supply, and the steam turbine does not have an external high-parameter steam supply interface. Therefore, the unit lacks the means to supply external industrial steam, which limits the application scenarios of the back-pressure unit. This type of back-pressure unit is mostly a single-cylinder unit design, and its structural characteristics determine that they usually do not have a reserved industrial steam supply interface. This means that when using these units for heating steam supply, it is often difficult to achieve the requirements of high-parameter industrial steam supply. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide an electric heating system applied to a back pressure unit, and the utility model can realize heating steam supply and high-parameter industrial steam supply of the back pressure unit.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses an electric heating system applied to a back pressure unit, comprising a back pressure steam turbine unit, the back pressure steam turbine unit is connected to a condensate pump, and the condensate pump is connected to an electrode steam boiler through a condensate water supply pipeline main line and a condensate water supply pipeline bypass;

[0007] A condensate main line valve is provided on the main line of the condensate water supply pipeline;

[0008] A variable speed booster pump is arranged on the bypass of the condensate water supply pipeline, a condensate bypass outlet valve is arranged between the variable speed booster pump and the condensate pump, and a booster pump outlet valve is arranged between the variable speed booster pump and the electrode steam boiler.

[0009] Furthermore, the back-pressure steam turbine unit is connected to the generator, and the generator is connected to the 220kV busbar of the unit.

[0010] Furthermore, the unit's 220kV busbar is connected to the unit's 10kV grid section through the main transformer, and the unit's 10kV grid section is connected to the electrode steam boiler.

[0011] Furthermore, the 10kV section grid of the unit and the electrode steam boiler are grounded through an electrical switch.

[0012] Furthermore, the electrode steam boiler is connected to an industrial steam supply pipeline.

[0013] Further, the back-pressure steam turbine unit is connected to the boiler.

[0014] Furthermore, the back-pressure steam turbine unit is connected to the condensate pump via a heat network heater, and the heat network heater is provided with heat network circulating water inlet and outlet pipelines.

[0015] Furthermore, the condensate pump is connected to the boiler via a condensate pump outlet valve.

[0016] Furthermore, a desalted water replenishment pipeline is connected between the condensate pump outlet valve and the boiler.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The back-pressure steam turbine unit of the utility model is used to supply high-temperature and high-pressure steam. The back-pressure steam turbine unit is connected to a condensate pump, which is respectively connected to an electrode steam boiler through a main condensate supply pipeline and a bypass condensate supply pipeline. A variable speed booster pump is provided between the electrode steam boiler and the condensate pump. The electrode steam boiler is used to heat the condensate of the steam turbine to the steam temperature required for industrial steam supply, and the variable speed booster pump is used to boost the condensate to the required steam supply pressure, so as to facilitate industrial steam supply and realize heating steam supply and high-parameter industrial steam supply of the back-pressure unit.

[0019] 2. The utility model provides a condensate main line valve on the main line of the condensate water supply pipeline. A condensate bypass outlet valve, a variable speed booster pump and a booster pump outlet valve are provided on the bypass line of the condensate water supply pipeline. When the external steam supply pressure of the device is less than the maximum adjustable pressure of the condensate pump outlet, the condensate main line valve is opened, the condensate bypass outlet valve and the booster pump outlet valve are closed, and the back-pressure steam turbine unit supplies water to the electrode steam boiler through the main line of the condensate water supply pipeline. When the external industrial steam supply pressure of the device is greater than the maximum adjustable pressure of the condensate pump, the condensate main line valve is closed, the condensate bypass outlet valve and the booster pump outlet valve are opened, thereby realizing the back-pressure steam turbine unit supplying water to the electrode steam boiler, and the condensate water supply pipeline bypass is pressurized by the variable speed booster pump to ensure the stability of the steam supply pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Among them: 1. Boiler; 2. Back-pressure steam turbine unit; 3. Generator; 4. Main transformer; 5. Electrical switch; 6. Heating network circulating water inlet and outlet pipelines; 7. Heating network heater; 8. Condensate pump; 9. Condensate pump outlet valve; 10. Condensate bypass outlet valve; 11. Condensate main line valve; 12. Electrode steam boiler; 13. Variable speed booster pump; 14. Industrial steam supply pipeline; 15. Booster pump outlet valve. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] The utility model is further described in detail below with reference to the accompanying drawings:

[0025] See also Figure 1 The utility model discloses an electric heating system applied to a back pressure unit, including a back pressure steam turbine unit 2, the back pressure steam turbine unit 2 is used to supply high temperature and high pressure steam, the back pressure steam turbine unit 2 is connected to a condensate pump 8, the condensate pump 8 is connected to an electrode steam boiler 12 through a condensate supply pipeline main line and a condensate supply pipeline bypass, and the electrode steam boiler 12 is used to heat the turbine condensate to the steam temperature required for industrial steam supply, so as to facilitate industrial steam supply.

[0026] A condensate main line valve 11 is provided on the main line of the condensate supply pipeline. When the external steam supply pressure of the device is lower than the maximum adjustable pressure of the condensate pump 8 outlet, the condensate main line valve 11 is opened, the condensate bypass outlet valve 10 and the booster pump outlet valve 15 are closed, and the back pressure steam turbine unit 2 supplies water to the electrode steam boiler 12 through the main line of the condensate supply pipeline.

[0027] A variable speed booster pump 13 is provided on the bypass of the condensate water supply pipeline, a condensate water bypass outlet valve 10 is provided between the variable speed booster pump 13 and the condensate water pump 8, and a booster pump outlet valve 15 is provided between the variable speed booster pump 13 and the electrode steam boiler 12. The variable speed booster pump 13 is used to boost the bypass of the condensate water supply pipeline to ensure stable steam supply pressure. When the external industrial steam supply pressure of the device is greater than the adjustable maximum pressure of the condensate water pump 8, the condensate main valve 11 is closed, and the condensate water bypass outlet valve 10 and the booster pump outlet valve 15 are opened, thereby realizing the back pressure steam turbine unit 2 to supply water to the electrode steam boiler 12, and the condensate water supply pipeline bypass is boosted by the variable speed booster pump 13 to ensure stable steam supply pressure. A variable speed booster pump is provided between the electrode steam boiler and the condensate water pump to boost the condensate water to the steam supply demand pressure, so as to facilitate industrial steam supply, realize the heating steam supply and high parameter industrial steam supply of the back pressure unit.

[0028] The utility model realizes the heating steam supply and high-parameter industrial steam supply of the back pressure unit, and improves the stability of industrial steam supply by setting the main line of the condensate water supply pipeline and the bypass of the condensate water supply pipeline. It can maximize the industrial steam supply and heating steam capacity of the back pressure unit, give full play to the industrial steam supply capacity of the back pressure unit, and flexibly match the required steam supply parameters.

[0029] See also Figure 1 In another feasible embodiment of the utility model, the following is adaptively modified according to the situation. It includes a back-pressure steam turbine unit 2, the back-pressure steam turbine unit 2 is connected to a condensate pump 8, and the condensate pump 8 is connected to an electrode steam boiler 12 through a condensate supply pipeline main line and a condensate supply pipeline bypass;

[0030] A condensate main line valve 11 is provided on the main line of the condensate water supply pipeline;

[0031] A variable speed booster pump 13 is provided on the bypass of the condensate water supply pipeline, a condensate bypass outlet valve 10 is provided between the variable speed booster pump 13 and the condensate pump 8, and a booster pump outlet valve 15 is provided between the variable speed booster pump 13 and the electrode steam boiler 12.

[0032] During specific operation, the high-temperature and high-pressure steam of the back-pressure turbine unit 2 is input into the electrode steam boiler 12 after passing through the condensate pump 8. The electrode steam boiler 12 is used to heat the turbine condensate to the steam temperature required for industrial steam supply, so as to facilitate industrial steam supply. The gas supply volume is determined by the opening of the condensate main valve 11, the condensate bypass outlet valve 10 and the booster pump outlet valve 15.

[0033] When the external steam supply pressure of the device is lower than the maximum adjustable pressure at the outlet of the condensate pump 8, the condensate main line valve 11 is opened, the condensate bypass outlet valve 10 and the booster pump outlet valve 15 are closed, and the back-pressure steam turbine unit 2 supplies water to the electrode steam boiler 12 through the main line of the condensate supply pipeline.

[0034] When the external industrial steam supply pressure of the device is greater than the maximum adjustable pressure of the condensate pump 8, the condensate main valve 11 is closed, and the condensate bypass outlet valve 10 and the booster pump outlet valve 15 are opened, so that the back-pressure steam turbine unit 2 supplies water to the electrode steam boiler 12, and the condensate supply pipeline is bypassed and pressurized by the variable speed booster pump 13 to ensure stable steam supply pressure.

[0035] Embodiment 1:

[0036] See also Figure 1 , this embodiment discloses an electric heating system applied to a back pressure unit, including a back pressure steam turbine unit 2, the back pressure steam turbine unit 2 is connected to a condensate pump 8, and the condensate pump 8 is connected to an electrode steam boiler 12 through a condensate water supply pipeline main line and a condensate water supply pipeline bypass;

[0037] A condensate main line valve 11 is provided on the main line of the condensate water supply pipeline;

[0038] A variable speed booster pump 13 is provided on the bypass of the condensate water supply pipeline, a condensate bypass outlet valve 10 is provided between the variable speed booster pump 13 and the condensate pump 8, and a booster pump outlet valve 15 is provided between the variable speed booster pump 13 and the electrode steam boiler 12.

[0039] Preferably, the back-pressure steam turbine unit 2 is connected to the generator 3, and the generator 3 is connected to the 220kV busbar of the unit.

[0040] Preferably, the 220kV busbar of the unit is connected to the 10kV section grid of the unit through the main transformer 4, and the 10kV section grid of the unit is connected to the electrode steam boiler 12.

[0041] Preferably, the 10 kV section grid of the unit is grounded to the electrode steam boiler 12 via an electrical switch 5 .

[0042] Embodiment 2:

[0043] See also Figure 1, this embodiment discloses an electric heating system applied to a back pressure unit, including a back pressure steam turbine unit 2, the back pressure steam turbine unit 2 is connected to a condensate pump 8, and the condensate pump 8 is connected to an electrode steam boiler 12 through a condensate water supply pipeline main line and a condensate water supply pipeline bypass;

[0044] A condensate main line valve 11 is provided on the main line of the condensate water supply pipeline;

[0045] A variable speed booster pump 13 is provided on the bypass of the condensate water supply pipeline, a condensate bypass outlet valve 10 is provided between the variable speed booster pump 13 and the condensate pump 8, and a booster pump outlet valve 15 is provided between the variable speed booster pump 13 and the electrode steam boiler 12.

[0046] Preferably, the electrode steam boiler 12 is connected to an industrial steam supply pipeline 14 .

[0047] Embodiment three:

[0048] See also Figure 1 , this embodiment discloses an electric heating system applied to a back pressure unit, including a back pressure steam turbine unit 2, the back pressure steam turbine unit 2 is connected to a condensate pump 8, and the condensate pump 8 is connected to an electrode steam boiler 12 through a condensate water supply pipeline main line and a condensate water supply pipeline bypass;

[0049] A condensate main line valve 11 is provided on the main line of the condensate water supply pipeline;

[0050] A variable speed booster pump 13 is provided on the bypass of the condensate water supply pipeline, a condensate bypass outlet valve 10 is provided between the variable speed booster pump 13 and the condensate pump 8, and a booster pump outlet valve 15 is provided between the variable speed booster pump 13 and the electrode steam boiler 12.

[0051] Preferably, the back-pressure steam turbine unit 2 is connected to the boiler 1 .

[0052] Preferably, the back-pressure steam turbine unit 2 is connected to the condensate pump 8 via a heat network heater 7 , and a heat network circulating water inlet and outlet pipeline 6 is provided in the heat network heater 7 .

[0053] Preferably, the condensate pump 8 is connected to the boiler 1 via a condensate pump outlet valve 9 .

[0054] Preferably, a desalination water supply pipeline is connected between the condensate pump outlet valve 9 and the boiler 1 .

[0055] Embodiment 4:

[0056] See also Figure 1The present embodiment discloses an electric heating system applied to a back pressure unit, comprising a boiler 1, a back pressure steam turbine unit 2, a generator 3, a main transformer 4, an electrical switch 5, a heat network circulating water inlet and outlet pipes 6, a heat network heater 7, a condensate pump 8, a condensate pump outlet valve 9, a condensate bypass outlet valve 10, a condensate main valve 11, an electrode steam boiler 12, a variable speed booster pump 13, an industrial steam supply pipeline 14 and a booster pump outlet valve 15.

[0057] The condensate at the outlet of the condensate pump 8 is controlled by the condensate main line valve 11 and the condensate bypass outlet valve 10, and enters the electrode steam boiler directly through the main line or enters the electrode steam boiler after being pressurized by the booster pump. Only one of the main line and the bypass can be opened at the same time.

[0058] The system adds an electrode steam boiler 12, and the inlet end is connected to the condensate main line valve 11 after the outlet of the condensate pump 8 and the newly added booster pump outlet valve 15. The condensate main line valve corresponds to the main line of the condensate supply pipeline, and the booster pump outlet valve 15 corresponds to the condensate supply pipeline bypass. The electrode steam boiler 12 is electrically connected from the 10kV section of the unit. The electrode steam boiler 12 heats the turbine condensate to the steam temperature required for industrial steam supply. The steam supply flow is determined by the speed of the condensate pump 8 and the electrode steam boiler inlet valve. The electrode steam boiler inlet valve jointly determines the condensate bypass outlet valve 10 and the condensate main line valve 11. The condensate is converted into high-temperature and high-pressure steam through the electrode steam boiler 12.

[0059] The system is newly equipped with a variable speed booster pump 13, which is arranged in the bypass of the condensate water supply pipeline. A condensate bypass outlet valve 10 is set at the inlet of the booster pump, which is connected to the outlet of the condensate pump 8. A booster pump outlet valve 15 is set at the outlet of the variable speed booster pump 13, which is connected to the inlet of the electrode steam boiler 12. If the external steam supply pressure is less than the maximum adjustable outlet pressure of the condensate pump 8, the external steam supply pressure requirement can be met by adjusting the outlet pressure of the condensate pump 8. At this time, the condensate bypass outlet valve 10 and the booster pump outlet valve 15 are closed, and the variable speed booster pump 13 is stopped. The condensate pressurized by the condensate pump 8 enters the electrode steam boiler through the condensate main valve 11.

[0060] If the external industrial steam supply pressure is greater than the maximum adjustable pressure of the condensate pump, the condensate main valve 11 is closed, the condensate bypass outlet valve 10 and the booster pump outlet valve 15 are opened, and the variable speed booster pump 13 is operated. The condensate is pressurized to the pressure required for industrial steam supply through the variable speed booster pump 13, and the pressurized condensate enters the electrode steam boiler 12.

[0061] The drained water and make-up water recovered through industrial steam supply re-enter the system and enter the boiler for heating, completing the cycle.

[0062] Since most back-pressure units only provide external heating in winter to achieve residential heating. Generally speaking, industrial steam supply parameters are much larger than residential heating steam supply, and the steam turbine does not have an external high-parameter steam supply interface, so the unit lacks the means of external industrial steam supply, which limits the application scenarios of the back-pressure unit. Therefore, an electric heating system applied to the back-pressure unit is proposed to achieve both residential heating and industrial steam supply.

[0063] The utility model system can guarantee the industrial steam supply and heating steam use capacity of the back pressure unit to the maximum extent, give full play to the industrial steam supply capacity of the back pressure unit, and can flexibly match the required steam supply parameters.

[0064] The above content is only for explaining the technical idea of ​​the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. An electric heating system applied to a back pressure unit, characterized in that: It comprises a back-pressure steam turbine unit (2), the back-pressure steam turbine unit (2) is connected to a condensate pump (8), and the condensate pump (8) is connected to an electrode steam boiler (12) through a condensate supply pipeline main line and a condensate supply pipeline bypass; A condensate main line valve (11) is provided on the main line of the condensate water supply pipeline; A variable speed booster pump (13) is arranged on the bypass of the condensate water supply pipeline, a condensate bypass outlet valve (10) is arranged between the variable speed booster pump (13) and the condensate pump (8), and a booster pump outlet valve (15) is arranged between the variable speed booster pump (13) and the electrode steam boiler (12).

2. The electric heating system for a back pressure unit according to claim 1, characterized in that: The back-pressure steam turbine unit (2) is connected to a generator (3), and the generator (3) is connected to a 220 kV busbar of the unit.

3. The electric heating system for a back pressure unit according to claim 2, characterized in that: The 220kV busbar of the unit is connected to the 10kV section grid of the unit through the main transformer (4), and the 10kV section grid of the unit is connected to the electrode steam boiler (12).

4. The electric heating system for a back pressure unit according to claim 3, characterized in that: The 10 kV section power grid of the unit is grounded to the electrode steam boiler (12) via an electrical switch (5).

5. The electric heating system for a back pressure unit according to claim 4, characterized in that: The electrode steam boiler (12) is connected to an industrial steam supply pipeline (14).

6. An electric heating system for a back pressure unit according to any one of claims 1 and 2, characterized in that: The back-pressure steam turbine unit (2) is connected to the boiler (1).

7. The electric heating system for a back pressure unit according to claim 6, characterized in that: The back-pressure steam turbine unit (2) is connected to a condensate pump (8) via a heat network heater (7), and a heat network circulating water inlet and outlet pipeline (6) is provided in the heat network heater (7).

8. The electric heating system for a back pressure unit according to claim 7, characterized in that: The condensate pump (8) is connected to the boiler (1) via a condensate pump outlet valve (9).

9. The electric heating system for a back pressure unit according to claim 8, characterized in that: A demineralized water replenishment pipeline is connected between the condensate pump outlet valve (9) and the boiler (1).

Images