Plate heat exchanger of heating station

Abstract

The utility model discloses a heating station plate heat exchanger which comprises a heat exchange station control terminal and a plate heat exchanger body, the plate heat exchanger body is provided with a first net water input pipeline, a first net water output pipeline, a second net water input pipeline and a second net water output pipeline, and the first net water input pipeline is provided with a buffer tank. The first network water output pipeline is communicated with the buffer tank through a branch pipeline, and temperature sensors are installed on the first network water input pipeline and the first network water output pipeline. According to the plate heat exchanger of the heating station, the flow of the first net entering the plate heat exchanger is controlled, and the temperature of the medium of the first net entering the plate heat exchanger is adjusted through the medium of the first net from the plate heat exchanger, so that the temperature of the medium of the first net entering the plate heat exchanger can be accurately and quickly reduced without reducing the flow speed; and the probability of blockage caused by calcium and magnesium ion precipitation due to high medium temperature and blockage caused by insufficient medium flow velocity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment for a thermal power station. Background Art

[0002] Plate heat exchanger is a kind of high-efficiency heat exchanger composed of a series of stacked metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. Plate heat exchanger is an ideal equipment for liquid-liquid and liquid-steam heat exchange. It has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, wide application and long service life. Under the same pressure loss, its heat transfer coefficient is 3-5 times higher than that of tubular heat exchanger, and the footprint is one-third of that of tubular heat exchanger. The heat recovery rate can be as high as over 90%.

[0003] The return water temperature of the thermal power station fluctuates, and usually other heat exchange methods are required for a heat exchange before the plate heat exchanger is used. There are two specific reasons for the blockage of the plate heat exchanger. First, the flow channel gap of the plate heat exchanger is small, and particles with a slightly larger diameter can easily block the plate channel; second, the water temperature entering the plate is too high, which causes the precipitation of calcium and magnesium ions in the internal medium to block the plate, causing the pressure drop of the equipment to deteriorate sharply, resulting in a significant reduction in the heat exchange capacity of the equipment due to blockage, and seriously causing the continuous production of the device to be interrupted. In order to reduce the probability of blockage caused by the above reasons, the following improvement plan is proposed after research. Utility Model Content

[0004] The purpose of the utility model is to provide a plate heat exchanger for a thermal power station to solve the problems raised in the above background technology.

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

[0006] A plate heat exchanger for a thermal power station comprises a heat exchange station control terminal and a plate heat exchanger, wherein the plate heat exchanger comprises a first water input pipeline, a first water output pipeline, a second water input pipeline and a second water output pipeline, wherein the first water input pipeline is provided with a buffer tank, the first water output pipeline is connected with the buffer tank via a branch pipeline, temperature sensors are installed on the first water input pipeline and the first water output pipeline, the temperature sensors respectively monitor the temperature of the first water when entering the buffer tank and the temperature of the first water when outputting from the plate heat exchanger, the first water output pipeline is connected with the branch pipeline via a flow control valve, and the heat exchange station control terminal controls the opening and closing ratio of the flow control valve via the first water inlet temperature.

[0007] As a further solution of the utility model: the first water input pipeline and the second water input pipeline are both connected to the descaling agent adding pipeline through the descaling agent branch pipe, and a water distributor is arranged on the descaling agent adding pipeline. The two output ends of the water distributor distribute the descaling agent to the first water input pipeline and the second water input pipeline evenly.

[0008] As a further solution of the utility model: a one-way valve is installed on the descaling agent branch pipe to prevent the water in the pipeline network from flowing into the descaling agent branch pipe.

[0009] As a further solution of the utility model: a tubular auxiliary heat exchanger is also arranged between the first network water input pipeline and the buffer tank, and the first network water enters the buffer tank through the tubular auxiliary heat exchanger. A remote control valve is installed at the input end of the tubular auxiliary heat exchanger.

[0010] As a further solution of the utility model: the remote control valve is controlled by the control terminal of the heating station, and if the temperature of a network of water is too high before entering the buffer tank, it will be auxiliary cooled through the tubular auxiliary heat exchanger.

[0011] As a further solution of the utility model: the output end of the buffer tank transports the medium to the plate heat exchanger through a pump body.

[0012] As a further solution of the utility model: filters are installed on the first network water input pipeline, the first network water output pipeline, the second network water input pipeline and the second network water output pipeline, and the medium in the pipeline network needs to be filtered before entering the plate heat exchanger and after being output from the plate heat exchanger.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The plate heat exchanger of the thermal power station controls the flow rate entering the plate heat exchanger through a network, and adjusts the temperature of the medium entering the plate heat exchanger through a network from the medium of the plate heat exchanger, so as to accurately and quickly reduce the temperature of the medium entering the plate heat exchanger through a network, while not reducing the flow rate, thereby reducing the probability of blockage caused by calcium and magnesium ion precipitation due to high medium temperature and insufficient medium flow rate.

[0015] 2. The plate heat exchanger of the thermal power station uses a tubular auxiliary heat exchanger to assist in cooling the temperature of a water input pipeline, thereby adding a temperature control mode. It can be switched with the medium mixed cooling mode or run simultaneously to cooperate with each other to reduce pipeline pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the structure of a plate heat exchanger in a thermal power station.

[0017] In the figure: 1. Plate heat exchanger; 2. First network water input pipeline; 3. Second network water output pipeline; 4. First network water output pipeline; 5. Second network water input pipeline; 6. Filter; 7. Descaling agent addition pipeline; 8. Water distributor; 9. Descaling agent branch pipe; 10. Branch pipeline; 11. Buffer tank; 12. Tubular auxiliary heat exchanger; 13. Temperature sensor; 14. Flow control valve; 15. Remote control valve. DETAILED DESCRIPTION

[0018] See also Figure 1 In an embodiment of the utility model, a plate heat exchanger for a thermal power station includes a heat exchange station control terminal and a plate heat exchanger 1. The plate heat exchanger 1 has a first water input pipeline 2, a first water output pipeline 4, a second water input pipeline 5 and a second water output pipeline 3. The first water input pipeline 2 is installed with a buffer tank 11. The first water output pipeline 4 is connected to the buffer tank 11 through a branch pipeline 10. Temperature sensors 13 are installed on the first water input pipeline 2 and the first water output pipeline 4. The temperature sensor 13 monitors the temperature of the first water when it enters the buffer tank 11 and the temperature of the first water when it is output from the plate heat exchanger 1. The first water output pipeline 4 is connected to the branch pipeline 10 through a flow control valve 14. The heat exchange station control terminal The terminal controls the opening and closing ratio of the flow control valve 14 through the temperature of the water entering the network. When the temperature sensor 13 detects that the medium temperature is higher than fifty degrees Celsius when the water is input, the flow control valve 14 will be turned through the heat exchange station control terminal. The flow control valve 14 adjusts the medium delivery ratio of the water output pipeline 4 and the branch pipeline 10 to increase the amount of low-temperature return water flowing back to the buffer tank 11, adjust the temperature of the water in the buffer tank 11, and send the medium in the buffer tank 11 to the plate heat exchanger 1 for heat exchange, which can quickly and effectively reduce the temperature of the medium entering the plate heat exchanger 1, thereby avoiding the blockage of calcium and magnesium ions in the plate, and effectively reducing the probability of calcium and magnesium ions precipitating and blocking the plate due to high medium temperature.

[0019] In a preferred embodiment, the first network water input pipeline 2 and the second network water input pipeline 5 are both connected to the descaling agent adding pipeline 7 through the descaling agent branch pipe 9, and a water divider 8 is arranged on the descaling agent adding pipeline 7. The two output ends of the water divider 8 evenly distribute the descaling agent to the first network water input pipeline 2 and the second network water input pipeline 5. The descaling agent adding pipeline 7 is connected to the descaling machine. When the outlet water temperature or the outlet water pressure is abnormal, it is descaled through the descaling agent adding pipeline 7. A one-way valve is installed on the descaling agent branch pipe 9 to prevent the network water from flowing into the descaling agent branch pipe 9. The one-way valve controls the water path to reduce the control pressure of the heat exchange station control terminal.

[0020] In a preferred embodiment, a tubular auxiliary heat exchanger 12 is further provided between a network water input pipeline 2 and the buffer tank 11. A network water enters the buffer tank 11 through the tubular auxiliary heat exchanger 12. A remote control valve 15 is installed at the input end of the tubular auxiliary heat exchanger 12. When the return water capacity is poor and the temperature difference from the calcium and magnesium precipitation temperature is small, the tubular auxiliary heat exchanger 12 can be used for heat dissipation to reduce the pressure of the network return water, and there is no need for the network outlet water to be cooled by low-temperature water. At the same time, the two modes can operate simultaneously or separately and can be debugged according to different temperatures. The remote control valve 15 is controlled by the heat station control terminal. If the temperature of a network water is too high before entering the buffer tank 11, it will be assisted in cooling through the tubular auxiliary heat exchanger 12 to realize intelligent control. A critical value is set to switch the intelligent control mode of the heat station control terminal, thereby reducing energy consumption and reducing pipeline pressure.

[0021] In a preferred embodiment, the output end of the buffer tank 11 transports the medium to the plate heat exchanger 1 through a pump body. The blockage of the plate heat exchanger 1 is also related to the flow rate of the medium. In order to avoid the instability of the medium flow rate caused by the buffer tank 11 and the temperature control process, the buffer tank 11 is used for buffering, and the pump body delivers the medium to the plate heat exchanger 1 at a constant speed to prevent the plate heat exchanger 1 from being blocked.

[0022] In a preferred embodiment, filters 6 are installed on the first water input pipeline 2, the first water output pipeline 4, the second water input pipeline 5 and the second water output pipeline 3. The medium in the pipeline network needs to be filtered before being input into the plate heat exchanger 1 and after being output from the plate heat exchanger 1. Whether it is return water or outlet water, impurities in the pipeline should be avoided. The medium quality is improved as much as possible through filtering to avoid blockage due to impurities. Since the outlet water may need to return to the return water line for temperature control, even at the outlet end, a filter 6 needs to be set to prevent impurities from flowing back into the plate heat exchanger 1.

[0023] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference can be made to the description in other embodiments.

[0024] The above-mentioned embodiments only express the implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A heat exchanger for a thermal power station, comprising a heat exchange station control terminal and a plate heat exchanger (1), the plate heat exchanger (1) having a first network water input pipeline (2), a first network water output pipeline (4), a second network water input pipeline (5) and a second network water output pipeline (3), characterized in that: The water network input pipeline (2) is equipped with a buffer tank (11), and the water network output pipeline (4) is connected to the buffer tank (11) through a branch pipeline (10). Temperature sensors (13) are installed on the water network input pipeline (2) and the water network output pipeline (4). The temperature sensors (13) respectively monitor the temperature of the water network when it enters the buffer tank (11) and the temperature of the water network when it is output from the plate heat exchanger (1). The water network output pipeline (4) is connected to the branch pipeline (10) through a flow control valve (14), and the heat exchange station control terminal controls the opening and closing ratio of the flow control valve (14) according to the water network inlet temperature.

2. A thermal power station plate heat exchanger according to claim 1, characterized in that: The first water input pipeline (2) and the second water input pipeline (5) are both connected to the descaling agent adding pipeline (7) through the descaling agent branch pipe (9). The descaling agent adding pipeline (7) is provided with a water distributor (8). The two output ends of the water distributor (8) distribute the descaling agent evenly into the first water input pipeline (2) and the second water input pipeline (5) through the first water input pipeline (2) and the second water input pipeline (5).

3. A thermal power station plate heat exchanger according to claim 2, characterized in that: The descaling agent branch pipe (9) is provided with a one-way valve to prevent water in the pipe network from flowing into the descaling agent branch pipe (9).

4. A thermal power station plate heat exchanger according to claim 1, characterized in that: A tubular auxiliary heat exchanger (12) is also provided between the first network water input pipeline (2) and the buffer tank (11), and the first network water enters the buffer tank (11) through the tubular auxiliary heat exchanger (12). A remote control valve (15) is installed at the input end of the tubular auxiliary heat exchanger (12).

5. A thermal power station plate heat exchanger according to claim 4, characterized in that: The remote control valve (15) is controlled by the heating station control terminal. If the temperature of the water in the first network is too high before entering the buffer tank (11), it will be auxiliary cooled through the tubular auxiliary heat exchanger (12).

6. A thermal power station plate heat exchanger according to claim 1, characterized in that: The output end of the buffer tank (11) transports the medium to the plate heat exchanger (1) through a pump body.

7. A plate heat exchanger for a thermal power station according to any one of claims 1 to 6, characterized in that: The first network water input pipeline (2), the first network water output pipeline (4), the second network water input pipeline (5) and the second network water output pipeline (3) are all installed with filters (6), and the medium in the pipeline network needs to be filtered before being input into the plate heat exchanger (1) and after being output from the plate heat exchanger (1).

Images