Air cooling island spraying device capable of reducing back pressure and control method of air cooling island spraying device

Abstract

The invention provides an air cooling island spraying device capable of reducing backpressure, which comprises a plurality of groups of high-temperature steam pipelines and condensed water pipelines, each high-temperature steam pipeline and two condensed water pipelines form one group, and air cooling fins are symmetrically and obliquely communicated between each group of high-temperature steam pipelines and two condensed water pipelines in a splayed shape; a passageway is arranged between every two different sets of condensation water pipelines, a pipeline supporting steel frame is arranged on each passageway, a spraying main pipe is arranged on each pipeline supporting steel frame in the direction of the corresponding high-temperature steam pipeline, and a plurality of sets of spraying branch pipes are symmetrically arranged on each spraying main pipe in the direction facing the air cooling fins on the two sides. Spraying heads are arranged at the ends, away from the spraying main pipes, of the spraying branch pipes, and the multiple spraying main pipes communicate with the same water inlet pipe. The spraying device is arranged beside the air cooling fins, spraying can be conducted at any time when the environment temperature is high for cooling and back pressure reduction, flexibility is high, and the situations that during manual flushing, the labor intensity of workers is too high, and heatstroke occurs are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air-cooling island cooling, and in particular to an air-cooling island spray device for reducing back pressure and a control method thereof. Background Art

[0002] The main function of the air cooling island (air cooling system) of a power plant is to cool the high-temperature exhaust steam of the steam turbine, and the condensed water is recycled to the exhaust device. Therefore, the air cooling system is the main means of adjusting the back pressure of the steam turbine. Due to the variability of the weather in the north, the heat exchange effect of the air cooling island cannot be maintained for a long time after the flushing work of the air cooling island is completed, and the problem of back pressure limiting the load of the unit when the ambient temperature is high cannot be solved.

[0003] The commonly used technical means at present is to regularly perform high-pressure water washing of the air-cooling island fins in summer to improve the heat exchange effect of the air-cooling island. At the same time, multiple high-pressure washings also have a certain impact on the service life of the air-cooling island heat exchange fins. In addition, in the high temperature environment in summer, the labor intensity of the workers during manual washing is high, and heatstroke is very likely to occur. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To achieve the above-mentioned purpose, the present invention proposes an air-cooled island spray device for reducing back pressure, comprising multiple groups of high-temperature steam pipes and condensate pipes, each high-temperature steam pipe and two condensate pipes form a group, and each group of high-temperature steam pipes and two condensate pipes are symmetrically connected and inclined in an "eight" shape with air-cooled fins, an aisle is provided between every two different groups of condensate pipes, a pipe supporting steel frame is provided on the aisle, a spray mother pipe is provided on the pipe supporting steel frame along the direction of the high-temperature steam pipe, multiple groups of spray branch pipes are symmetrically provided on the spray mother pipe towards the direction of the air-cooled fins on both sides, a spray head is provided on the end of the spray branch pipe away from the spray mother pipe, and multiple spray mother pipes are connected to the same water inlet pipe.

[0006] The present invention arranges a spray device next to the air-cooled fins so that the spray can be started at any time to cool down and reduce the back pressure when the ambient temperature is high. It has high flexibility and avoids the occurrence of excessive labor intensity and heatstroke of workers during manual flushing.

[0007] Optionally, a recovery water pipe is provided on the spray aisle, the recovery water tank is provided below the aisle floor, and a groove connected to the recovery water pipe is provided on the aisle floor, the recovery water pipe is connected to an industrial water tank, and the water inlet pipe is connected to the industrial water tank.

[0008] Furthermore, a main spray electric valve is arranged on the water inlet pipe, and a main pipe electric valve is arranged on each spray main pipe near one end of the water inlet pipe, and the main pipe electric valve and the main spray electric valve are electrically connected to the same controller.

[0009] Furthermore, it also includes a back pressure sensor arranged in the air-cooled island unit, a temperature sensor for detecting the ambient temperature is arranged in the aisle, and the back pressure sensor and the temperature sensor are both electrically connected to the controller.

[0010] Furthermore, a desalted water pump is provided on the water inlet pipe.

[0011] The present invention also provides a control method for an air-cooled island spray device for reducing back pressure, comprising the following steps:

[0012] S1. Establish a spray device with different levels of control. A first-level spray device, a second-level spray device and a third-level spray device are sequentially arranged along the direction of the water inlet pipe, which are respectively arranged at the head, middle and tail of the area requiring air cooling and heat dissipation, so as to cover the air-cooled fins in the entire heat dissipation area;

[0013] S2, the back pressure sensor monitors the back pressure of the air-cooled island unit in real time, and the temperature sensor monitors the ambient temperature in real time, and transmits the monitored real-time back pressure data and real-time temperature data to the controller;

[0014] S3. The controller compares the obtained real-time back pressure data and real-time temperature data with the back pressure threshold and temperature threshold, and controls the main pipe spray electric valves in different levels of spray devices to open or close according to the comparison results to start and stop the spraying operation.

[0015] Further, in S3, the back pressure threshold includes:

[0016] The first threshold value is 33Kpa; the second threshold value is 35Kpa; the third threshold value is 37Kpa; the fourth threshold value is 39Kpa;

[0017] The temperature threshold is set to 25°C.

[0018] Furthermore, in step S3, when opening the main pipe spray electric valves of different levels of spray devices, the prerequisite that the air cooling island fan speed reaches 100% and the main spray electric valve is opened must be met.

[0019] Furthermore, when opening the main pipe spray electric valves of different levels of spray devices, the control logic is as follows:

[0020] When the ambient temperature is less than 25°C, the ambient temperature can support the natural heat dissipation requirements of the air-cooled fins, and there is no need to turn on the multi-stage spray device;

[0021] When the ambient temperature is greater than 25°C, the controller controls different levels of spray devices to start heat dissipation operations according to the back pressure data of different units:

[0022] When 35Kpa<unit back pressure<37Kpa, open the main pipe spray electric valve of the first-stage spray device;

[0023] When 37Kpa<unit back pressure<39Kpa, open the main pipe spray electric valve of the second-stage spray device;

[0024] When the unit back pressure is greater than 39Kpa, open the main pipe spray electric valve of the third-stage spray device.

[0025] Furthermore, when closing the main pipe spray electric valves of different levels of spray devices, it is necessary to close the multi-stage spray devices one by one according to the back pressure data of the unit. The control logic is as follows:

[0026] When 35Kpa<unit back pressure<37Kpa, close the main pipe spray electric valve of the third-stage spray device;

[0027] When 33Kpa<unit back pressure<35Kpa, close the main pipe spray electric valve of the second-stage spray device;

[0028] When the back pressure of the unit is less than 33Kpa, close the main pipe spray electric valve of the first-stage spray device;

[0029] When closing the main pipe spray electric valve of any level of spray device, it is necessary to first ensure that the main pipe spray electric valve of the spray device of this level is in the open state before executing the closing action.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 It is a schematic front view of the structure of an air-cooled island spray device for reducing back pressure according to the present invention;

[0033] Figure 2 It is a schematic diagram of a top view of the structure of an air-cooled island spray device for reducing back pressure according to the present invention;

[0034] Figure 3 It is a schematic diagram of the structure and piping structure of an air-cooled island spray device for reducing back pressure according to the present invention;

[0035] Figure 4It is a schematic diagram of the steps of a method for controlling an air-cooling island spray device for reducing back pressure according to the present invention;

[0036] Figure 5 It is a logic flow diagram of opening a multi-stage spray device according to a method for controlling an air-cooling island spray device for reducing back pressure of the present invention;

[0037] Figure 6 The present invention is a logic flow diagram of closing a multi-stage spray device according to a method for controlling an air-cooled island spray device for reducing back pressure.

[0038] Description of reference numerals:

[0039] 1. High-temperature steam pipe; 2. Condensate pipe; 3. Air-cooled fins; 4. Aisle; 41. Return pipe; 42. Industrial water tank; 43. Desalination pump; 5. Support steel frame; 6. Spray main pipe; 61. Main pipe electric valve; 7. Spray branch pipe; 71. Spray head; 8. Water inlet pipe; 81. Main spray electric valve. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] The present invention provides an air-cooled island spray device for reducing back pressure, as shown below Figures 1 to 6 Elaborate in detail.

[0042] An air-cooled island spray device for reducing back pressure comprises a plurality of groups of high-temperature steam pipes 1 and condensate pipes 2, each high-temperature steam pipe 1 and two condensate pipes 2 form a group, and each group of high-temperature steam pipes 1 and two condensate pipes 2 are symmetrically connected and obliquely connected in an "eight" shape with air-cooled fins 3, an aisle 4 is arranged between every two different groups of condensate pipes 2, a pipe supporting steel frame 5 is arranged on the aisle 4, a spray mother pipe 6 is arranged on the pipe supporting steel frame 5 along the direction of the high-temperature steam pipe 1, a plurality of groups of spray branch pipes 7 are symmetrically arranged on the spray mother pipe 6 towards the direction of the air-cooled fins 3 on both sides, a spray head 71 is arranged at one end of the spray branch pipe 7 away from the spray mother pipe 6, and a plurality of spray mother pipes 6 are connected to the same water inlet pipe 8.

[0043] The present invention arranges a spraying device beside the air-cooling fin 3 so that the spraying can be started at any time to cool down and reduce the back pressure when the ambient temperature is high. It has high flexibility and avoids the occurrence of excessive labor intensity and heatstroke of workers during manual flushing.

[0044] In some embodiments, a recycling water pipe is provided on the spray aisle 4, the recycling water tank is provided below the floor of the aisle 4, and a slot connected to the recycling water pipe is provided on the floor of the aisle 4, the recycling water pipe is connected to an industrial water tank 42, and the water inlet pipe 8 is connected to the industrial water tank 42. The recycling water pipe can be set to recycle the spray water falling in the aisle 4, and the accumulated water on the aisle 4 flows into the industrial water tank 42 through the recycling water pipe. The water inlet pipe 8 supplies the water pumped into the industrial water tank 42 to the positions of each spray head 71 for spraying operation. Realize the recycling collection and reuse of water flow

[0045] In some embodiments, a main spray electric valve 81 is provided on the water inlet pipe 8, and a main pipe electric valve 61 is provided on each spray main pipe 6 near one end of the water inlet pipe 8, and the main pipe electric valve 61 and the main spray electric valve 81 are electrically connected to the same controller. The main spray electric valve 81 and the main pipe electric valve 61 electrically connected to the controller can be easily automated, reducing manpower input.

[0046] In some embodiments, it also includes a back pressure sensor set in the air-cooled island unit, and a temperature sensor for detecting the ambient temperature is set in the aisle 4, and the back pressure sensor and the temperature sensor are both electrically connected to the controller. The setting of the back pressure sensor and the temperature sensor facilitates the controller to collect the real-time data of the unit's back pressure and the ambient temperature data, so as to judge whether it is necessary to open each mother pipe electric gate according to the ambient temperature; when the ambient temperature for opening the mother pipe electric gate is met, according to the real-time data of the unit's back pressure, the controller can control the mother pipe electric valves 61 on multiple groups of different spray mother pipes 6, so as to realize the action of opening or closing the multi-stage spray mother pipes 6 one by one according to the increase or decrease of the unit's back pressure. It avoids the waste of water resources caused by opening multiple spray mother pipes 6 when the ambient temperature is low or the back pressure is not high enough.

[0047] In some embodiments, a desalting water pump is provided on the water inlet pipe 8. The provision of the desalting water pump 43 can reduce impurities in the water and reduce salt crystals condensed on the air-cooling fins 3 after the spray water evaporates.

[0048] The present invention also provides a control method for an air-cooled island spray device for reducing back pressure, comprising the following steps:

[0049] S1. Establish a spray device with different levels of control. A first-level spray device, a second-level spray device and a third-level spray device are sequentially arranged along the water inlet pipe 8, which are respectively arranged at the head, middle and tail of the area requiring air cooling and heat dissipation, so as to cover the air-cooled fins 3 in the entire heat dissipation area;

[0050] S2, the back pressure sensor monitors the back pressure of the air-cooled island unit in real time, and the temperature sensor monitors the ambient temperature in real time, and transmits the monitored real-time back pressure data and real-time temperature data to the controller;

[0051] S3. The controller compares the obtained real-time back pressure data and real-time temperature data with the back pressure threshold and temperature threshold, and controls the main pipe spray electric valves in different levels of spray devices to open or close according to the comparison results to start and stop the spraying operation.

[0052] The multi-stage spray device can be set to open a single-stage spray device or a multi-stage spray device according to the increase of back pressure. The controller compares and judges the detected unit back pressure data with the back pressure threshold. When the corresponding threshold requirement is reached, the multi-stage spray device is opened one by one to perform spraying operations to eliminate the unit back pressure.

[0053] In some embodiments, in S3, the backpressure threshold includes:

[0054] The first threshold value is 33Kpa; the second threshold value is 35Kpa; the third threshold value is 37Kpa; the fourth threshold value is 39Kpa;

[0055] The temperature threshold is set to 25°C.

[0056] In some embodiments, in step S3, when opening the main pipe spray electric valves of different levels of spray devices, the prerequisites that the air cooling island fan speed reaches 100% and the main spray electric valve 81 is opened must be met.

[0057] In some other embodiments, when the main pipe spray electric valves of different levels of spray devices are opened, the control logic is as follows:

[0058] When the ambient temperature is less than 25°C, the ambient temperature can support the natural heat dissipation demand of the air-cooled fins 3, and there is no need to turn on the multi-stage spray device;

[0059] When the ambient temperature is greater than 25°C, the controller controls different levels of spray devices to start heat dissipation operations according to the back pressure data of different units:

[0060] When 35Kpa<unit back pressure<37Kpa, open the main pipe spray electric valve of the first-stage spray device;

[0061] When 37Kpa<unit back pressure<39Kpa, on the premise of opening the main pipe spray electric valve of the first-stage spray device as mentioned above, open the main pipe spray electric valve of the second-stage spray device;

[0062] When the back pressure of the unit is greater than 39Kpa, on the premise of opening the spray electric valves of the first-stage and second-stage spray main pipes 6, open the main pipe spray electric valve of the third-stage spray device.

[0063] In some embodiments, when closing the main pipe spray electric valves of different levels of spray devices, it is necessary to close the multi-stage spray devices one by one according to the back pressure data of the unit. The control logic is as follows:

[0064] When 35Kpa<unit back pressure<37Kpa, close the main pipe spray electric valve of the third-stage spray device;

[0065] When 33Kpa<unit back pressure<35Kpa, under the premise of closing the main pipe spray electric valve of the third-stage spray device as mentioned above, close the main pipe spray electric valve of the second-stage spray device;

[0066] When the back pressure of the unit is less than 33Kpa, on the premise of closing the main pipe spray electric valves of the third-stage and second-stage spray devices as mentioned above, close the main pipe spray electric valve of the first-stage spray device;

[0067] When closing the main pipe spray electric valve of any one level of spray device, the controller or manual operation will first determine that the main pipe spray electric valve of the spray device of this level is in an open state before executing the closing action.

[0068] That is, when only the first-stage spray device is opened, the action of closing the first-stage spray device is executed only when the back pressure of the unit is less than 33Kpa;

[0069] When the first and second stage spray devices are opened, the second stage spray device will be closed only when 33Kpa<unit back pressure<35Kpa, and the first stage spray device will be closed when the unit back pressure is<33Kpa;

[0070] When the first, second and third stage spray devices are opened, the third stage spray device, the second stage spray device and the first stage spray device are closed in sequence according to the above-mentioned unit back pressure judgment condition.

[0071] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air-cooled island spray device for reducing back pressure, comprising a plurality of groups of high-temperature steam pipes and condensate pipes, each high-temperature steam pipe and two condensate pipes form a group, and each group of high-temperature steam pipes and two condensate pipes are connected in an eight-shaped symmetrical and inclined manner and are provided with air-cooled fins, characterized in that: An aisle is provided between every two different groups of condensate pipes, and a pipe supporting steel frame is provided on the aisle. A spray mother pipe is provided on the pipe supporting steel frame along the direction of the high-temperature steam pipe. The spray mother pipe is symmetrically provided with multiple groups of spray branch pipes toward the air-cooling fins on both sides. A spray head is provided at one end of the spray branch pipe away from the spray mother pipe, and multiple spray mother pipes are connected to the same water inlet pipe.

2. The air-cooling island spray device for reducing back pressure according to claim 1, characterized in that: A recovery water pipe is arranged on the spray aisle, the recovery water tank is arranged below the aisle floor, and a groove connected to the recovery water pipe is arranged on the aisle floor, the recovery water pipe is connected to an industrial water tank, and the water inlet pipe is connected to the industrial water tank.

3. The air-cooled island spray device for reducing back pressure according to claim 2, characterized in that: The water inlet pipe is provided with a main spray electric valve, and each spray main pipe is provided with a main pipe electric valve near one end of the water inlet pipe. The main pipe electric valve and the main spray electric valve are electrically connected to the same controller.

4. The air-cooling island spray device for reducing back pressure as claimed in claim 3, characterized in that: It also includes a back pressure sensor arranged in the air-cooled island unit, a temperature sensor for detecting the ambient temperature is arranged in the aisle, and the back pressure sensor and the temperature sensor are both electrically connected to the controller.

5. The air-cooling island spray device for reducing back pressure as claimed in claim 4, characterized in that: The water inlet pipe is provided with a desalted water pump.

6. A control method for an air-cooled island spray device for reducing back pressure as claimed in any one of claims 4 or 5, characterized in that: The following steps are involved: S1. Establish a spray device with different levels of control. A first-level spray device, a second-level spray device and a third-level spray device are sequentially arranged along the direction of the water inlet pipe, which are respectively arranged at the head, middle and tail of the area requiring air cooling and heat dissipation, so as to cover the air-cooled fins in the entire heat dissipation area; S2, the back pressure sensor monitors the back pressure of the air-cooled island unit in real time, and the temperature sensor monitors the ambient temperature in real time, and transmits the monitored real-time back pressure data and real-time temperature data to the controller; S3. The controller compares the obtained real-time back pressure data and real-time temperature data with the back pressure threshold and temperature threshold, and controls the main pipe spray electric valves in different levels of spray devices to open or close according to the comparison results to start and stop the spraying operation.

7. A control method for an air-cooling island spray device for reducing back pressure as claimed in claim 6, characterized in that: In S3, the back pressure threshold includes: The first threshold value is 33Kpa; the second threshold value is 35Kpa; the third threshold value is 37Kpa; the fourth threshold value is 39Kpa; The temperature threshold is set to 25°C.

8. A control method for an air-cooled island spray device for reducing back pressure as claimed in claim 7, characterized in that: In step S3, when opening the main pipe spray electric valves of different levels of spray devices, the prerequisites that the air cooling island fan speed reaches 100% and the main spray electric valve is opened must be met.

9. A control method for an air-cooling island spray device for reducing back pressure as claimed in claim 8, characterized in that: When opening the main pipe spray electric valves of different levels of spray devices, the control logic is as follows: When the ambient temperature is less than 25°C, the ambient temperature can support the natural heat dissipation requirements of the air-cooled fins, and there is no need to turn on the multi-stage spray device; When the ambient temperature is greater than 25°C, the controller controls different levels of spray devices to start heat dissipation operations according to the back pressure data of different units: When 35Kpa<unit back pressure<37Kpa, open the main pipe spray electric valve of the first-stage spray device; When 37Kpa<unit back pressure<39Kpa, open the main pipe spray electric valve of the second-stage spray device; When the unit back pressure is greater than 39Kpa, open the main pipe spray electric valve of the third-stage spray device.

10. A control method for an air-cooled island spray device for reducing back pressure as claimed in claim 9, characterized in that: When closing the main pipe spray electric valves of different levels of spray devices, it is necessary to close the multi-stage spray devices one by one according to the back pressure data of the unit. The control logic is as follows: When 35Kpa<unit back pressure<37Kpa, close the main pipe spray electric valve of the third-stage spray device; When 33Kpa<unit back pressure<35Kpa, close the main pipe spray electric valve of the second-stage spray device; When the back pressure of the unit is less than 33Kpa, close the main pipe spray electric valve of the first-stage spray device; When closing the main pipe spray electric valve of any level of spray device, it is necessary to first ensure that the main pipe spray electric valve of the spray device of this level is in the open state before executing the closing action.

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