Gas turbine inlet air heating system utilizing waste heat of condensed water

Abstract

The utility model relates to the technical field of gas-steam combined cycle units, and discloses a gas turbine air inlet heating system utilizing condensed water waste heat, which comprises a condensed water pump, a condensed water main pipeline, a waste heat boiler, an air inlet heating heat exchanger, a bypass pipeline, a manual valve, an electric control valve, an electric gate valve, a flue gas filter, an air inlet pipe and an air supply pipe, the output end of the condensate pump is connected with a condensate water main pipeline, and the output end of the condensate water main pipeline is connected with the waste heat boiler; the electric control valve and the electric gate valve are arranged on the condensed water main pipeline; and the condensation water main pipeline is communicated with the bypass pipeline on the two sides of the electric gate valve. In the actual use process, the safety of the whole unit is effectively improved, energy consumption is reduced, control is easy, the coupling difficulty with an original DCS control strategy is low, implementation is easy, high-temperature gas in the unit operation process is introduced, and the heat energy utilization efficiency is further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of gas-steam combined cycle units, specifically a gas turbine intake air heating system that utilizes the waste heat of condensate. Background Technology

[0002] In recent years, the climate in North my country has further deteriorated, with frequent and persistent extreme weather events such as smog, snow, and ice in winter. Some combined cycle turbine units, which are the main heating units in these areas, typically switch to high back pressure operation during the heating season by replacing the turbine rotor. Under these conditions, the operating load is generally between 60% and 75%, and the condensate temperature reaches as high as 80℃. A significant amount of low-grade waste heat remains unutilized, resulting in energy waste. To prevent ice and wet blockage problems in the gas turbine intake system under severe weather conditions, which could affect the safe operation of the unit, and to address the issue of low energy utilization, [further measures are needed].

[0003] To address this, we propose a gas turbine intake heating system that utilizes the waste heat of condensate to heat the gas turbine intake, thereby enabling the unit to operate safely and efficiently. Utility Model Content

[0004] The purpose of this invention is to provide a gas turbine intake heating system that utilizes the waste heat of condensate, thus solving the problems mentioned in the background art.

[0005] This application provides a gas turbine intake air heating system utilizing condensate waste heat, including a condensate pump, a condensate main pipeline, a waste heat boiler, an intake air heating heat exchanger, a bypass pipeline, a manual valve, an electric regulating valve, an electric gate valve, a flue gas filter, an intake pipe, and an air delivery pipe. The output end of the condensate pump is connected to the condensate main pipeline, and the output end of the condensate main pipeline is connected to the waste heat boiler.

[0006] The main condensate pipeline is equipped with the electric regulating valve and the electric gate valve;

[0007] The bypass pipes are connected to both sides of the electric gate valve in the main condensate pipeline. The inlet section of the bypass pipe is connected to the main condensate pipeline upstream of the electric gate valve for the introduction of condensate. The outlet section of the bypass pipe is connected to the main condensate pipeline downstream of the electric gate valve. The bypass pipe is also connected to the air intake heat exchanger, so that the bypass pipe, the air intake heat exchanger, and the main condensate pipeline form a controllable through hole at the electric gate valve, which allows the condensate to enter the air intake heat exchanger for treatment as needed, or to be directly introduced into the waste heat boiler for waste heat recovery.

[0008] The inlet of the gas supply pipe is connected to the flue gas filter, the flue gas filter is connected to the inlet pipe, and the inlet pipe is connected to the waste heat boiler. Through the gas supply pipe, the high-temperature flue gas generated by the heating gas turbine is guided and filtered at the flue gas filter. Finally, it is sent to the waste heat boiler through the inlet pipe. In conjunction with the aforementioned condensate pump and inlet heating heat exchanger, the waste heat is further recovered and utilized.

[0009] Optionally, the main condensate pipeline is provided with connecting pipes on both sides of the electric regulating valve, and manual valves are installed on the pipes.

[0010] Optionally, the air inlet pipe is equipped with a one-way valve to facilitate the one-way delivery of the high-temperature air after it has been treated by the flue gas filter, and to make it easier to control the direction of the high-temperature air.

[0011] Optionally, the waste heat boiler is equipped with a temperature sensor and a pressure sensor.

[0012] By adopting the above technical solution, the internal water vapor temperature and internal pressure can be monitored to ensure effective recovery and utilization of waste heat while ensuring internal pressure safety.

[0013] Optionally, the waste heat boiler is connected to an exhaust pipe, and the exhaust pipe is equipped with a pressure relief valve.

[0014] By adopting the above technical solution and in conjunction with the temperature and pressure sensors, the temperature and pressure inside the waste heat boiler can be effectively monitored. When the internal temperature drops or the pressure is too high, the exhaust pipe is opened through the pressure relief valve to release the internal gas, preparing for the subsequent injection of high-temperature air, thus ensuring the safe use of the equipment while the waste heat boiler is recovering waste heat.

[0015] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0016] 1. To ensure that the normal operation of the unit is not affected in the event of an accident in the intake heating system, an electric regulating valve bypass is added between the inlet and outlet of the system. This bypass is activated in the event of an accident in the intake heating system to ensure condensate supply and improve the safety of unit operation.

[0017] 2. Compared with existing technologies, the system does not require an additional booster pump, thus reducing energy consumption;

[0018] 3. The system is simple to control; adjusting the flow rate only requires controlling the opening of the electric regulating valve. It is easy to couple with the existing DCS system control strategy and is easy to implement.

[0019] 4. While recovering and utilizing the waste heat from the condensate, the entire system also introduces the high-temperature gas generated during the unit's operation, filters it, and introduces it into the waste heat boiler, further improving the efficiency of heat energy utilization. Through the setting of temperature sensors, pressure sensors, and pressure relief valves, the system ensures the effective utilization of heat energy while ensuring internal pressure safety.

[0020] In summary, this application effectively improves the overall safety of the unit, reduces energy consumption, simplifies control, and is easy to implement by coupling with the original DCS system control strategy. It also introduces high-temperature gas during unit operation to further improve thermal energy utilization efficiency. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a gas turbine intake heating system that utilizes the waste heat of condensate.

[0023] In the diagram: 1. Condensate pump; 2. Main condensate pipe; 3. Waste heat boiler; 4. Inlet air heating heat exchanger; 5. Bypass pipe; 6. Manual valve; 7. Electric regulating valve; 8. Electric gate valve; 9. Flue gas filter; 10. Inlet pipe; 11. Gas supply pipe; 12. Temperature sensor; 13. Pressure sensor; 14. Pressure relief valve; 15. Exhaust pipe; 16. Check valve. Detailed Implementation

[0024] Please see Figure 1 This utility model provides a technical solution: a gas turbine intake air heating system utilizing condensate waste heat, including a condensate pump 1, a condensate main pipeline 2, a waste heat boiler 3, an intake air heating heat exchanger 4, a bypass pipeline 5, a manual valve 6, an electric regulating valve 7, an electric gate valve 8, a flue gas filter 9, an intake pipe 10, and an air supply pipe 11. The output end of the condensate pump 1 is connected to the condensate main pipeline 2, and the output end of the condensate main pipeline 2 is connected to the waste heat boiler 3.

[0025] The main condensate pipeline 2 is equipped with an electric regulating valve 7 and an electric gate valve 8;

[0026] A bypass pipe 5 is connected to both sides of the electric gate valve 8. The inlet section of the bypass pipe 5 is connected to the upstream condensate main pipe 2 of the electric gate valve 8 for the introduction of condensate. The outlet section of the bypass pipe 5 is connected to the downstream condensate main pipe 2 of the electric gate valve 8. The bypass pipe 5 is also connected to the air intake heat exchanger 4, so that the bypass pipe 5, the air intake heat exchanger 4 and the condensate main pipe 2 form a controllable through hole at the electric gate valve 8, which allows the condensate to enter the air intake heat exchanger 4 for treatment as needed, or to be directly introduced into the waste heat boiler 3 for waste heat recovery.

[0027] The inlet of the gas supply pipe 11 is connected to the flue gas filter 9, the flue gas filter 9 is connected to the inlet pipe 10, and the inlet pipe 10 is connected to the waste heat boiler 3. Through the gas supply pipe 11, the high-temperature flue gas generated by the heating gas turbine is guided and filtered at the flue gas filter 9. Finally, it is sent to the waste heat boiler 3 through the inlet pipe 10. It is further used in conjunction with the aforementioned condensate pump 1 and inlet heating heat exchanger 4 to achieve further recovery and utilization of waste heat.

[0028] Furthermore, the main condensate pipe 2 is provided with connecting pipes on both sides of the electric regulating valve 7, and a manual valve 6 is installed on the pipes.

[0029] Furthermore, a one-way valve 16 is provided on the air intake pipe 10 to facilitate the one-way delivery of the high-temperature air processed by the flue gas filter 9, and to facilitate the control of the direction of the high-temperature air.

[0030] Furthermore, the waste heat boiler 3 is equipped with a temperature sensor 12 and a pressure sensor 13 to monitor the internal water vapor temperature and internal pressure, ensuring effective recovery and utilization of waste heat while ensuring internal pressure safety.

[0031] Specifically, the waste heat boiler 3 is connected to an exhaust pipe 15, which is equipped with a pressure relief valve 14. In conjunction with the temperature sensor 12 and the pressure sensor 13, the temperature and pressure inside the waste heat boiler 3 are effectively monitored. When the internal temperature drops or the pressure is too high, the pressure relief valve 14 controls the opening of the exhaust pipe 15 to release the internal gas, preparing for the subsequent injection of high-temperature air. This ensures that the waste heat boiler 3 can recover waste heat while ensuring the safe use of the equipment.

Claims

1. A gas turbine intake air heating system utilizing condensate waste heat, comprising a condensate pump (1), a condensate main pipeline (2), a waste heat boiler (3), an intake air heating heat exchanger (4), a bypass pipeline (5), a manual valve (6), an electric regulating valve (7), an electric gate valve (8), a flue gas filter (9), an intake pipe (10), and an air supply pipe (11), characterized in that: The output end of the condensate pump (1) is connected to the condensate main pipeline (2), and the output end of the condensate main pipeline (2) is connected to the waste heat boiler (3). The condensate main pipeline (2) is equipped with the electric regulating valve (7) and the electric gate valve (8); The main condensate pipe (2) is connected to the bypass pipe (5) on both sides of the electric gate valve (8). The inlet section of the bypass pipe (5) is connected to the main condensate pipe (2) upstream of the electric gate valve (8) for the introduction of condensate. The outlet section of the bypass pipe (5) is connected to the main condensate pipe (2) downstream of the electric gate valve (8). The bypass pipe (5) is also connected to the air intake heat exchanger (4), so that the bypass pipe (5), the air intake heat exchanger (4), and the main condensate pipe (2) form a controllable through hole at the electric gate valve (8). The input end of the gas supply pipe (11) is connected to the flue gas filter (9), the flue gas filter (9) is connected to the air inlet pipe (10), and the air inlet pipe (10) is connected to the waste heat boiler (3).

2. The gas turbine intake air heating system utilizing condensate waste heat according to claim 1, characterized in that, The main condensate pipe (2) has connecting pipes on both sides of the electric regulating valve (7), and a manual valve (6) is installed on the pipes.

3. A gas turbine intake air heating system utilizing condensate waste heat according to claim 1, characterized in that, The intake pipe (10) is equipped with a one-way valve (16).

4. A gas turbine intake air heating system utilizing condensate waste heat according to claim 1, characterized in that, The waste heat boiler (3) is equipped with a temperature sensor (12) and a pressure sensor (13).

5. A gas turbine intake air heating system utilizing condensate waste heat according to claim 4, characterized in that, The waste heat boiler (3) is connected to an exhaust pipe (15), and a pressure relief valve (14) is provided on the exhaust pipe (15).

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