Unit air heating system with rapid water draining function

Abstract

The utility model relates to a unit air heating system with a rapid water draining function. The unit air heating system comprises an air inlet heater. A water supply port of the air inlet heater is communicated with a water supply pipeline and provided with a water supply control valve, and a water return port is communicated with a water return pipeline; a water supply port of the air inlet heater is communicated with a breather pipe communicated with the atmospheric environment and is provided with an air inlet control valve, and a water return port is communicated with a drainage subsystem which is matched with the breather pipe to drain out water in a pipeline in the air inlet heater. The system can actively and quickly pump out water stored in the air inlet heater, prevents the water stored in the equipment from being frozen, and guarantees the operation safety of the equipment and the operation safety of the whole system.

Description

Technical Field

[0001] This utility model relates to the field of circulating unit technology, and in particular to a unit air heating system with rapid water drainage function. Background Technology

[0002] Against the backdrop of the times, the installed capacity of new energy sources is gradually increasing. How to mitigate the cyclicality and volatility of new energy power generation is one of the challenges facing the new power system. Combined cycle units, as the ballast and stabilizer for peak shaving in the power system, possess extremely strong peak-shaving capabilities. To further enhance unit operating capacity and optimize comprehensive energy utilization efficiency, the unit can establish a low-grade waste heat cycle by activating the intake air heating system, achieving waste heat recovery from the high-temperature condensate of the back-pressure turbine and cascaded energy utilization. However, during winter operation under accident conditions, there is a significant probability of a special situation where the heat source of the intake air heater is lost while the air flow remains constant. If drainage is not completed in time, the water stored on the intake air heater tube side will rapidly freeze under the action of a large flow of cold air, causing volume expansion leading to pipe blockage and bulging, resulting in rupture of the intake air heater tube bundle, equipment failure, and leakage of the working fluid, endangering the safe operation of the unit. Utility Model Content

[0003] This invention provides a unit air heating system with rapid water drainage function, which can actively and quickly extract water stored in the air intake heater, prevent water in the equipment from freezing, and ensure the safe operation of the equipment and the entire system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An air heating system for generator units with rapid water-draining function, including an intake heater;

[0006] The water supply port of the aforementioned air inlet heater is connected to a water supply pipe and is equipped with a water supply control valve, while the return water port is connected to a return water pipe.

[0007] The water supply port of the aforementioned air inlet heater is connected to a vent pipe that connects to the atmospheric environment and is equipped with an air inlet control valve. The water return port is connected to a drainage subsystem, which works in conjunction with the aforementioned vent pipe to drain water from the pipes inside the aforementioned air inlet heater.

[0008] Preferably, the hydrophobic subsystem includes a jet vacuum pump and a compressed air supply assembly;

[0009] A drain pipe is connected between the water inlet of the jet vacuum pump and the water return outlet of the gas inlet heater, and a drain control valve is installed on the drain pipe.

[0010] An air supply pipe is connected between the air inlet of the aforementioned jet vacuum pump and the air outlet of the aforementioned compressed air supply assembly, and an air supply control valve is installed on the aforementioned air supply pipe.

[0011] Preferably, the compressed air supply component includes either a compressed air storage tank or an air compressor.

[0012] Preferably, the outlet of the jet vacuum pump is connected to a condensate tank.

[0013] Preferably, the water supply control valve, the air intake control valve, the drain control valve, and the air supply control valve are all solenoid valves.

[0014] Preferably, the above-mentioned hydrophobic subsystem includes a hydrophobic pump, the inlet of which is connected to the return outlet of the air inlet heater, and the outlet is connected to a hydrophobic tank.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] The design incorporates a drainage subsystem that can actively and quickly extract water from the intake heater, achieving rapid drainage and preventing water in the intake heater pipes from freezing rapidly under the influence of large-volume cold air, which could lead to pipe blockage or expansion. This ensures the safe operation of the equipment and the entire system. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall system in an embodiment of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Air intake heater; 2. Water supply pipe; 3. Water return pipe; 4. Vent pipe; 5. Jet vacuum pump; 6. Compressed air supply assembly; 7. Drain pipe; 8. Air supply pipe; 9. Water supply control valve; 10. Air intake control valve; 11. Drain control valve; 12. Air supply control valve; 13. Drain tank. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] To further enhance the operational capacity and optimize the overall energy utilization efficiency of existing heating units, a low-grade waste heat cycle is established by putting into operation an intake air heating system. This enables the recovery of waste heat from the high-temperature condensate of the back-pressure steam turbine and the cascade utilization of energy. The intake air heating system includes an intake air heater 1. The water supply port of the intake air heater 1 is connected to a water supply pipe 2, and the water return port is connected to a water return pipe 3. The water supply pipe 2, the water return pipe 3, and the water pipe inside the intake air heater 1 form a water supply loop. The water supply loop is used to circulate the high-temperature condensate of the back-pressure steam turbine. Correspondingly, the intake air heater 1 is also equipped with an air inlet and an air outlet, which are connected to an air inlet pipe and an air outlet pipe, respectively. The air outlet pipe is connected to the unit's gas turbine. During normal operation in winter, the high-temperature condensate exchanges heat with the air in the intake air heat exchanger to heat the air. The heated air then enters the gas turbine for use, thus realizing the recovery of waste heat from the high-temperature condensate of the back-pressure steam turbine and the cascade utilization of energy.

[0025] However, during winter operation, if the unit is in an emergency situation, there is a high probability that the heat source of the intake heater 1 will be lost while the air flow remains unchanged. If drainage is not completed in time, the water on the pipe side of the intake heater 1 will freeze rapidly under the action of a large flow of cold air, causing volume expansion, blockage, and pipe bulging, leading to the rupture of the intake heater 1 tube bundle, resulting in equipment failure and leakage of water working fluid, endangering the safe operation of the unit. To solve the above problems, this embodiment provides a unit air heating system with rapid drainage function, such as... Figure 1 As shown, the system includes an air intake heater 1. Based on the original pipeline, a vent pipe 4 is connected to the water inlet of the air intake heater 1, connecting it to the external atmosphere. A drainage subsystem is connected to the water return outlet of the air intake heater 1. During winter, when the unit is in an emergency operating condition, the drainage subsystem works in conjunction with the vent pipe 4 to quickly drain water from the inner pipe of the air intake heater 1. Specifically, the water supply control valve 9 on the water supply pipeline 2 is closed, shutting off the entire water supply circuit. Simultaneously, the air intake control valve 10 on the vent pipe 4 is opened, connecting the inner pipe of the air intake heater 1 to the outside atmosphere. At the same time, the drainage subsystem is activated, rapidly extracting water from the air intake heater 1 to achieve rapid drainage. This prevents the water in the air intake heater 1 pipeline from rapidly freezing under the influence of large-volume cold air, causing volume expansion and blockage or bulging of the pipes, thus ensuring the safe operation of the equipment and the entire system.

[0026] In this embodiment, the condensate drainage subsystem includes a jet vacuum pump 5 and a compressed air supply assembly 6. Specifically, a condensate drain pipe 7 connects the inlet of the jet vacuum pump 5 and the return outlet of the intake heater 1, and a condensate drain control valve 11 is installed on the condensate drain pipe 7. An air supply pipe 8 connects the air inlet of the jet vacuum pump 5 and the air outlet of the compressed air supply assembly 6, and an air supply control valve 12 is installed on the air supply pipe 8. Specifically, when the unit is in normal heating operation during winter, the intake control valve 10, the condensate drain control valve 11, and the air supply control valve 12 are in the closed state, and the intake heat exchanger is in normal use, exchanging heat with the air through high-temperature condensate to preheat the air entering the gas turbine. When the unit is in an emergency operating condition during winter, the water supply control valve 9 is closed, while the air intake control valve 10, the drain control valve 11, and the air supply control valve 12 are opened. The compressed air supply assembly 6 supplies compressed air to the jet vacuum pump 5 through the air supply pipe 8. The compressed air carries away the internal air, thereby creating a vacuum inside the jet vacuum pump 5. The water stored in the air intake heater 1 enters the jet vacuum pump 5 under the pressure of the external atmosphere and is then discharged from the jet vacuum pump 5, thus achieving the purpose of outputting water stored in the air intake heater 1. Furthermore, the use of the jet vacuum pump 5 for draining water results in a faster draining speed and shorter time. In actual operation, the freezing of water stored in the air intake heater 1 can be completely avoided.

[0027] Specifically, in this embodiment, the compressed air supply component 6 includes either a compressed air tank or an air compressor. The outlet of the compressed air tank or the outlet of the air compressor is connected to the air supply pipe 8 to supply air to the jet vacuum pump 5. Of course, in actual use, a compressed air tank is used, thereby saving the electrical energy required to start the compressed air pump.

[0028] Specifically, the outlet of the jet vacuum pump 5 is connected to a condensate tank 13, which is used to store the water discharged from the air inlet heater 1 by the jet vacuum pump 5, so as to avoid the waste of water resources. Of course, the water in the condensate tank 13 can be directly returned to the condensate pipe for reuse.

[0029] Specifically, the water supply control valve 9, the air inlet control valve 10, the condensate control valve 11, and the air supply control valve 12 are all solenoid valves, which facilitates the control of the opening and closing of each pipeline by the staff and enables quick switching between heat exchange and condensate.

[0030] In another embodiment, the hydrophobic subsystem includes a hydrophobic pump, the inlet of which is connected to the return outlet of the air heater 1, and the outlet is connected to a hydrophobic tank 13. When it is necessary to drain the water stored in the air heater 1, it is only necessary to run the hydrophobic pump to pump the stored water into the hydrophobic tank 13.

[0031] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A unit air heating system with rapid hydrophobic function, characterized in that, Including the intake heater; The water supply port of the air inlet heater is connected to a water supply pipe and is equipped with a water supply control valve, and the water return port is connected to a water return pipe. The water supply port of the air inlet heater is connected to a vent pipe that connects to the atmospheric environment and is equipped with an air inlet control valve. The water return port is connected to a drainage subsystem, which works in conjunction with the vent pipe to drain water from the pipes inside the air inlet heater.

2. The unit air heating system with rapid hydrophobic function according to claim 1, characterized in that, The hydrophobic subsystem includes a jet vacuum pump and a compressed air supply assembly; A drain pipe is connected between the water inlet of the jet vacuum pump and the water return outlet of the air inlet heater, and a drain control valve is installed on the drain pipe. An air supply pipe is connected between the air inlet of the jet vacuum pump and the air outlet of the compressed air supply assembly, and an air supply control valve is provided on the air supply pipe.

3. The unit air heating system with rapid hydrophobic function according to claim 2, characterized in that, The compressed air supply assembly includes either a compressed air storage tank or an air compressor.

4. The unit air heating system with rapid hydrophobic function according to claim 2, characterized in that, The outlet of the jet vacuum pump is connected to a condensate tank.

5. The unit air heating system with rapid hydrophobic function according to claim 2, characterized in that, The water supply control valve, the air intake control valve, the condensate control valve, and the air supply control valve are all solenoid valves.

6. The unit air heating system with rapid hydrophobic function according to claim 1, characterized in that, The hydrophobic subsystem includes a hydrophobic pump, the inlet of which is connected to the return outlet of the air inlet heater, and the outlet of which is connected to a hydrophobic tank.

Images