Steam and water supply system applied to back pressure unit

Abstract

The utility model belongs to the technical field of heat and power supply of cogeneration turbosets, and relates to a steam and water supply system applied to a backpressure unit. Comprising a condensate pump, an inlet of the condensate pump is connected with an outlet of a backpressure turboset, the condensate pump is connected with an inlet of an electrode hot-water boiler through a booster pump, and an outlet of the electrode hot-water boiler is connected with an electrode steam generator and a temperature reduction heat exchanger. Condensed water sequentially passes through the booster pump and the electrode hot water boiler, the booster pump is used for pressurizing the condensed water, and the electrode hot water boiler is used for increasing the temperature of the condensed water. The pressurized and warmed condensed water is vaporized and warmed through the electrode steam generator, so that industrial steam supply is facilitated; and the pressurized and heated condensed water is cooled and adjusted through the temperature reduction heat exchanger, so that industrial water supply is facilitated. While heating is achieved for residents, the requirements for high-parameter and large-capacity industrial steam supply and industrial water supply can be met, and water supply or steam supply parameters are flexible and adjustable.

Description

Technical Field

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

[0002] As an efficient way of energy utilization, cogeneration significantly reduces the loss of cold sources, thereby maximizing the utilization of energy. It is an extremely effective means of energy conservation and consumption reduction. In cogeneration technology, back pressure units are particularly widely used. Back pressure units use all of their exhaust steam to heat the circulating water of the heat network for heating, almost completely eliminating the loss of cold sources, greatly improving energy utilization efficiency. This type of unit has been widely used in small units and undertakes the important task of heating local residents.

[0003] However, due to the design characteristics of the back-pressure unit, its application scenarios are subject to certain restrictions. Most back-pressure units are only used to supply heat to the outside in winter to meet the heating needs of residents. But it is worth noting that the parameters of industrial steam supply and industrial water supply are usually much higher than those of residential heating steam supply, and back-pressure steam turbines often lack interfaces for external high-parameter steam supply. This makes it impossible for the unit to provide the steam and water supply required by industry, thus limiting the application of back-pressure units in a wider range of fields.

[0004] In addition, most of these models are single-cylinder units, without a reserved industrial steam supply interface, and therefore cannot meet the requirements of high-parameter industrial steam supply. At the same time, most heating water supply is at normal pressure, with a temperature of about 100°C, which cannot meet the needs of high-pressure and high-temperature water required by some industrial processes. Utility Model Content

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a steam and water supply system applied to a back pressure unit. While realizing heating for residents, the utility model can meet the needs of high-parameter and large-capacity industrial steam and industrial water supply, and the parameters are flexibly adjustable.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses a steam and water supply system for a back pressure unit, comprising a condensate pump, the inlet of the condensate pump is connected to the outlet of the back pressure steam turbine unit, the condensate pump is connected to the inlet of an electrode hot water boiler through a booster pump, and the outlet of the electrode hot water boiler is respectively connected to an electrode steam generator and a temperature reducing heat exchanger.

[0008] Furthermore, the condensate pump and the electrode hot water boiler are connected through a condensate supply pipeline, and a condensate main valve is arranged on the condensate supply pipeline;

[0009] A condensate supply pipeline bypass is arranged in parallel with the condensate supply pipeline, a booster pump is arranged on the condensate supply pipeline bypass, a booster pump inlet valve is arranged between the booster pump and the condensate pump, and a booster pump outlet valve is arranged between the booster pump and the electrode hot water boiler.

[0010] Furthermore, a steam generator water inlet valve is arranged between the electrode hot water boiler and the electrode steam generator.

[0011] Furthermore, the outlet of the electrode steam generator is connected to the inlet of the industrial steam supply pipeline, and an electrode steam generator outlet valve is arranged at the outlet of the electrode steam generator.

[0012] Furthermore, a second desuperheating water inlet valve is arranged between the electrode hot water boiler and the desuperheating heat exchanger.

[0013] Furthermore, the inlet of the desuperheating heat exchanger is connected to the outlet of the condensate pump, and a first desuperheating water inlet valve is provided between the desuperheating heat exchanger and the condensate pump.

[0014] Furthermore, an inlet check valve is provided between the desuperheating heat exchanger and the second desuperheating water inlet valve.

[0015] Furthermore, the outlet of the desuperheating heat exchanger is connected to the inlet of the industrial water supply pipeline.

[0016] Furthermore, a heat network heater is provided between the back pressure steam turbine unit and the condensate pump, and a heat network circulating water heating pipeline is arranged in the heat network heater;

[0017] The inlet of the back-pressure steam turbine unit is connected to the outlet of the boiler, the outlet of the condensate pump is connected to the inlet of the boiler, and a condensate pump outlet valve is arranged between the condensate pump and the boiler.

[0018] Furthermore, the back-pressure steam turbine unit is connected to a generator, and the generator is respectively connected to the electrode hot water boiler and the electrode steam generator through power supply lines.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The utility model uses a back-pressure steam turbine unit to supply high-temperature and high-pressure condensate through a condensate pump. The condensate passes through a booster pump and an electrode hot water boiler in sequence. The booster pump is used to pressurize the condensate, and the electrode hot water boiler is used to increase the temperature of the condensate. The pressure and temperature values ​​can be flexibly adjusted according to demand. The pressurized and heated condensate is vaporized and heated by an electrode steam generator until the steam temperature required for industrial steam supply is reached, so as to facilitate industrial steam supply; the pressurized and heated condensate is cooled and adjusted by a cooling heat exchanger, and the water discharged from the cooling heat exchanger is cooled to the temperature required for industrial water supply, so as to facilitate industrial water supply. While realizing heating for residents, the utility model can meet the high-parameter and large-capacity industrial steam and industrial water supply needs, and the parameters of water supply or steam supply are flexibly adjustable.

[0021] 2. The condensate pump of the utility model is connected to the electrode hot water boiler through the condensate water supply pipeline and the condensate water supply pipeline bypass respectively. The condensate water supply pipeline is provided with a condensate main valve, the condensate water supply pipeline bypass is provided with a booster pump, a booster pump inlet valve is provided between the booster pump and the condensate water pump, and a booster pump outlet valve is provided between the booster pump and the electrode hot water boiler. If the external steam / water supply pressure of the device is less than the maximum adjustable outlet pressure of the condensate water pump, the outlet pressure of the condensate water pump can be adjusted to meet the external steam supply pressure requirement. At this time, close the booster pump inlet valve and the booster pump outlet valve, stop the booster pump, and the condensate pressurized by the condensate pump enters the electrode hot water boiler through the valve. If the external industrial steam / water supply pressure is greater than the adjustable maximum pressure of the condensate pump, close the condensate main valve, open the booster pump inlet valve and booster pump outlet valve, run the booster pump, and boost the condensate to the pressure required by the industrial steam / water supply through the booster pump. The boosted condensate enters the electrode hot water boiler, ensuring the stability of the industrial steam / water supply pressure of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] Among them: 1. Boiler; 2. Back-pressure steam turbine unit; 3. Generator; 4. Heating network circulating water heating pipeline; 5. Heating network heater; 6. Condensate pump; 7. Condensate pump outlet valve; 8. Booster pump inlet valve; 9. Condensate main line valve; 10. Booster pump outlet valve; 11. Booster pump; 12. Electrode hot water boiler; 13. First cooling water inlet valve; 14. Second cooling water inlet valve; 15. Steam generator inlet valve; 16. Electrode steam generator; 17. Electrode steam generator outlet valve; 18. Inlet check valve; 19. Cooling heat exchanger. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] The utility model is further described in detail below with reference to the accompanying drawings:

[0027] See also Figure 1 The utility model discloses a steam and water supply system for a back pressure unit, including a condensate pump 6, the inlet of the condensate pump 6 is connected to the outlet of the back pressure steam turbine unit 2, and the back pressure steam turbine unit 2 supplies high temperature and high pressure condensate through the condensate pump 6. The condensate pump 6 is connected to the inlet of the electrode hot water boiler 12 through a booster pump 11, and the booster pump 11 can further increase the pressure of the condensate. The electrode hot water boiler 12 is used to heat the pressurized condensate and heat the turbine condensate to the temperature required by industrial steam supply, so as to facilitate industrial steam and water supply. The outlet of the electrode hot water boiler 12 is respectively connected to the electrode steam generator 16 and the desuperheating heat exchanger 19; the electrode steam generator 16 is used to heat the water discharged from the electrode hot water boiler 12 to steam, reaching the steam temperature required by industrial steam supply, so as to facilitate industrial steam supply; the desuperheating heat exchanger 19 is used to cool the water discharged from the electrode hot water boiler 12 to the temperature required by industrial water supply, so as to facilitate industrial water supply. The utility model can realize heating for residents and meet the needs of industrial steam supply and industrial water supply with high parameters and large capacity at the same time, and the parameters of water supply or steam supply are flexibly adjustable.

[0028] See also Figure 1In another feasible embodiment of the utility model, the following is adaptively modified according to the situation. It includes a condensate pump 6, the inlet of the condensate pump 6 is connected to the outlet of the back pressure steam turbine unit 2, the condensate pump 6 is connected to the inlet of the electrode hot water boiler 12 through the booster pump 11, and the outlet of the electrode hot water boiler 12 is respectively connected to the electrode steam generator 16 and the desuperheating heat exchanger 19.

[0029] During specific operation, the high-temperature and high-pressure steam of the back-pressure steam turbine unit 2 passes through the condensate pump 6 and then passes through the booster pump 11 and the electrode hot water boiler 12 in sequence. The booster pump 11 is used to increase the pressure of the condensate, and the electrode hot water boiler 12 is used to increase the temperature of the condensate. The pressure increase and temperature increase values ​​can be flexibly adjusted according to demand;

[0030] The pressurized and heated condensed water is vaporized and heated by the electrode steam generator 16 until the steam temperature required for industrial steam supply is reached, so as to facilitate industrial steam supply; the pressurized and heated condensed water is cooled and adjusted by the cooling heat exchanger 19, and the water discharged from the cooling heat exchanger 19 is cooled to the temperature required for industrial water supply, so as to facilitate industrial water supply.

[0031] Embodiment 1:

[0032] See also Figure 1 The utility model discloses a steam and water supply system for a back pressure unit, including a condensate pump 6, the inlet of the condensate pump 6 is connected to the outlet of the back pressure steam turbine unit 2, the condensate pump 6 is connected to the inlet of the electrode hot water boiler 12 through a booster pump 11, and the outlet of the electrode hot water boiler 12 is respectively connected to an electrode steam generator 16 and a desuperheating heat exchanger 19.

[0033] Preferably, the condensate pump 6 and the electrode hot water boiler 12 are connected through a condensate supply pipeline, and a condensate main valve 9 is arranged on the condensate supply pipeline;

[0034] A condensate supply pipeline bypass is arranged in parallel with the condensate supply pipeline, a booster pump 11 is arranged on the condensate supply pipeline bypass, a booster pump inlet valve 8 is arranged between the booster pump 11 and the condensate pump 6, and a booster pump outlet valve 10 is arranged between the booster pump 11 and the electrode hot water boiler 12.

[0035] Embodiment 2:

[0036] See also Figure 1 The utility model discloses a steam and water supply system for a back pressure unit, including a condensate pump 6, the inlet of the condensate pump 6 is connected to the outlet of the back pressure steam turbine unit 2, the condensate pump 6 is connected to the inlet of the electrode hot water boiler 12 through a booster pump 11, and the outlet of the electrode hot water boiler 12 is respectively connected to an electrode steam generator 16 and a desuperheating heat exchanger 19.

[0037] Preferably, a steam generator water inlet valve 15 is arranged between the electrode hot water boiler 12 and the electrode steam generator 16 .

[0038] Preferably, the outlet of the electrode steam generator 16 is connected to the inlet of the industrial steam supply pipeline, and an electrode steam generator outlet valve 17 is provided at the outlet of the electrode steam generator 16 .

[0039] Embodiment three:

[0040] See also Figure 1 The utility model discloses a steam and water supply system for a back pressure unit, including a condensate pump 6, the inlet of the condensate pump 6 is connected to the outlet of the back pressure steam turbine unit 2, the condensate pump 6 is connected to the inlet of the electrode hot water boiler 12 through a booster pump 11, and the outlet of the electrode hot water boiler 12 is respectively connected to an electrode steam generator 16 and a desuperheating heat exchanger 19.

[0041] Preferably, a second desuperheating water inlet valve 14 is arranged between the electrode hot water boiler 12 and the desuperheating heat exchanger 19 .

[0042] Preferably, the inlet of the desuperheating heat exchanger 19 is connected to the outlet of the condensate pump 6 , and a first desuperheating water inlet valve 13 is provided between the desuperheating heat exchanger 19 and the condensate pump 6 .

[0043] Preferably, an inlet check valve 18 is provided between the desuperheating heat exchanger 19 and the second desuperheating water inlet valve 14 .

[0044] Preferably, the outlet of the desuperheating heat exchanger 19 is connected to the inlet of the industrial water supply pipeline.

[0045] Embodiment 4:

[0046] See also Figure 1 The utility model discloses a steam and water supply system for a back pressure unit, including a condensate pump 6, the inlet of the condensate pump 6 is connected to the outlet of the back pressure steam turbine unit 2, the condensate pump 6 is connected to the inlet of the electrode hot water boiler 12 through a booster pump 11, and the outlet of the electrode hot water boiler 12 is respectively connected to an electrode steam generator 16 and a desuperheating heat exchanger 19.

[0047] Preferably, a heat network heater 5 is provided between the back pressure steam turbine unit 2 and the condensate pump 6, and a heat network circulating water heating pipeline 4 is arranged in the heat network heater 5;

[0048] The inlet of the back-pressure steam turbine unit 2 is connected to the outlet of the boiler 1 , the outlet of the condensate pump 6 is connected to the inlet of the boiler 1 , and a condensate pump outlet valve 7 is arranged between the condensate pump 6 and the boiler 1 .

[0049] Preferably, the back-pressure steam turbine unit 2 is connected to the generator 3, and the generator 3 is respectively connected to the electrode hot water boiler 12 and the electrode steam generator 16 through power supply lines.

[0050] Embodiment five:

[0051] See also Figure 1 The utility model discloses a steam and water supply system for a back pressure unit, comprising a boiler 1, a back pressure steam turbine unit 2, a generator 3, a heat network circulating water heating pipeline 4, a heat network heater 5, a condensate pump 6, a condensate pump outlet valve 7, a booster pump inlet valve 8, a condensate main line valve 9, a booster pump outlet valve 10, a booster pump 11, an electrode hot water boiler 12, a first cooling water inlet valve, a second cooling water inlet valve 14, a steam generator inlet valve 15, an electrode steam generator 16, an electrode steam generator outlet valve 17, an inlet check valve 18 and a cooling heat exchanger 19.

[0052] The system adds an electrode hot water boiler 12. The inlet end of the electrode hot water boiler 12 is respectively connected to the condensate main line valve 9 after the outlet of the condensate pump 6 and the booster pump outlet valve 10 of the booster pump 11. The condensate main line valve 9 is located on the main line of the condensate water supply pipeline, and the booster pump outlet valve 10 is located on the bypass of the condensate water supply pipeline. The electricity for the electrode hot water boiler is connected to the 10kV section of the unit and the new energy power supply. The purpose of the electrode hot water boiler is to heat the condensate to saturated water of a certain temperature and pressure. On the one hand, it meets the requirements of industrial water supply, and on the other hand, it serves as the inlet medium of the electrode steam generator 16.

[0053] The system is newly equipped with a cooling heat exchanger 19 and a corresponding inlet check valve 18, the inlet end of which is connected to the second cooling water inlet valve 14, the second cooling water inlet valve 14 is connected to the outlet of the electrode hot water boiler 12, and the outlet end of the cooling heat exchanger 19 is the industrial water supply pipeline. The cooling heat exchanger 19 is connected to the condensate water pipeline via the first cooling water inlet valve 13, and the outlet water of the electrode hot water boiler 12 is cooled by condensate water to meet the requirements of industrial water parameters, and also has the function of allocating flow.

[0054] The system supplies hot water to the outside, and the hot water at the outlet of the electrode hot water boiler 12 enters the cooling heat exchanger 19 through the second cooling water inlet valve 14 and the inlet check valve 18. The cooling water is taken from the condensed water, and the condensed water enters the cooling heat exchanger through the first cooling water inlet valve 13 to cool the outlet hot water of the electrode hot water boiler 12 to the required temperature. The cooling water flow is adjusted by the second cooling water inlet valve 14 to obtain appropriate industrial water supply parameters, and is transported to the outside through the industrial water supply pipeline.

[0055] The system adds an electrode steam generator 16, the inlet end of the electrode steam generator 16 is connected to the steam generator water inlet valve 15, and the outlet end of the electrode steam generator 16 is connected to the electrode steam generator outlet valve 17. The electrode steam generator 16 is powered by the 10kV section of the unit and the new energy supply. The purpose of the electrode steam generator 16 is to heat saturated water into superheated steam of a certain pressure and temperature to meet the needs of industrial steam.

[0056] A booster pump 11 is newly added, and the booster pump 11 is arranged in the bypass of the condensate water supply pipeline. The booster pump inlet valve 8 is provided at the booster pump inlet, and the booster pump inlet valve 8 is connected to the outlet of the condensate pump 6. A booster pump outlet valve 10 is provided at the outlet of the booster pump 11, and the booster pump outlet valve 10 is connected to the inlet of the electrode hot water boiler 12.

[0057] The condensate at the outlet of the condensate pump 6 is controlled by the condensate main line valve 9 and the booster pump inlet valve 8. The condensate enters the electrode hot water boiler 12 directly through the main line or enters the electrode hot water boiler 12 after being pressurized by the booster pump 11. Only one of the main line and the bypass can be opened at the same time.

[0058] If the external steam / water supply pressure is less than the maximum adjustable pressure at the outlet of the condensate pump 6, the external steam supply pressure requirement can be met by adjusting the outlet pressure of the condensate pump 6. At this time, close the booster pump inlet valve 8 and the booster pump outlet valve 10, stop the booster pump 11, and the condensate pressurized by the condensate pump 6 enters the electrode hot water boiler through the condensate main line valve 9.

[0059] If the external industrial steam / water supply pressure is greater than the adjustable maximum pressure of the condensate pump 6, the condensate main line valve 9 is closed, the booster pump inlet valve 8 and the booster pump outlet valve 10 are opened, and the booster pump 11 is operated. The condensate is pressurized to the pressure required by the industrial steam / water supply through the booster pump 11, and the pressurized condensate enters the electrode hot water boiler 12.

[0060] The drain water recovered through industrial steam supply and the desalted water make-up water re-enter the system and enter boiler 1 for heating, completing the cycle.

[0061] The system utilizes an electrode hot water boiler 12 and an electrode steam generator 16. The power supply comes from the 10kV section and is connected to the new energy power supply system. It can absorb a large amount of green electricity. When green electricity cannot be used, it is replaced by the power supply of the steam turbine itself, which is flexible to adjust.

[0062] The entire system can meet the needs of residential heating and water supply, industrial water and industrial steam respectively.

[0063] The utility model system can guarantee the industrial steam supply, industrial water supply and heating steam supply capacity of the back pressure unit to the maximum extent, give full play to the industrial steam supply / water supply capacity of the back pressure unit, and flexibly match the required steam and water supply parameters. The system uses electrode hot water boilers and electrode steam generators, which can absorb a large amount of new energy. When green electricity cannot be used, it is replaced by the power generation of the steam turbine itself, which is flexible to adjust.

[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. A steam and water supply system for a back pressure unit, It is characterized in that It comprises a condensate pump (6), the inlet of the condensate pump (6) is connected to the outlet of the back pressure steam turbine unit (2), the condensate pump (6) is connected to the inlet of the electrode hot water boiler (12) through a booster pump (11), and the outlet of the electrode hot water boiler (12) is respectively connected to the electrode steam generator (16) and the desuperheating heat exchanger (19).

2. A steam and water supply system for a back pressure unit according to claim 1, It is characterized in that The condensate pump (6) and the electrode hot water boiler (12) are connected via a condensate supply pipeline, and a condensate main valve (9) is arranged on the condensate supply pipeline; A condensate water supply pipeline bypass is arranged in parallel with the condensate water supply pipeline, a booster pump (11) is arranged on the condensate water supply pipeline bypass, a booster pump inlet valve (8) is arranged between the booster pump (11) and the condensate water pump (6), and a booster pump outlet valve (10) is arranged between the booster pump (11) and the electrode hot water boiler (12).

3. A steam and water supply system for a back pressure unit according to any one of claims 1 and 2, It is characterized in that A steam generator water inlet valve (15) is arranged between the electrode hot water boiler (12) and the electrode steam generator (16).

4. A steam and water supply system for a back pressure unit according to claim 3, It is characterized in that The outlet of the electrode steam generator (16) is connected to the inlet of the industrial steam supply pipeline, and an electrode steam generator outlet valve (17) is arranged at the outlet of the electrode steam generator (16).

5. According to claim 3, a steam and water supply system for a back pressure unit, It is characterized in that A second desuperheating water inlet valve (14) is arranged between the electrode hot water boiler (12) and the desuperheating heat exchanger (19).

6. A steam and water supply system for a back pressure unit according to claim 5, It is characterized in that The inlet of the desuperheating heat exchanger (19) is connected to the outlet of the condensate pump (6), and a first desuperheating water inlet valve (13) is provided between the desuperheating heat exchanger (19) and the condensate pump (6).

7. A steam and water supply system for a back pressure unit according to claim 6, It is characterized in that An inlet check valve (18) is provided between the desuperheating heat exchanger (19) and the second desuperheating water inlet valve (14).

8. A steam and water supply system for a back pressure unit according to claim 7, It is characterized in that The outlet of the desuperheating heat exchanger (19) is connected to the inlet of the industrial water supply pipeline.

9. The steam and water supply system for a back pressure unit according to claim 1, It is characterized in that A heat network heater (5) is provided between the back pressure steam turbine unit (2) and the condensate pump (6), and a heat network circulating water heating pipeline (4) is arranged in the heat network heater (5); The inlet of the back-pressure steam turbine unit (2) is connected to the outlet of the boiler (1), the outlet of the condensate pump (6) is connected to the inlet of the boiler (1), and a condensate pump outlet valve (7) is arranged between the condensate pump (6) and the boiler (1).

10. The steam and water supply system for a back pressure unit according to claim 1, It is characterized in that The back-pressure steam turbine unit (2) is connected to a generator (3), and the generator (3) is respectively connected to an electrode hot water boiler (12) and an electrode steam generator (16) through power supply lines.

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