Direct air cooling unit air cooling island forced cooling system

Abstract

The utility model discloses and provides an air cooling island forced cooling system of a direct air cooling unit, belongs to the technical field of cooling of air cooling units, and aims to solve the problems that the effective utilization efficiency of an existing spraying temperature reduction device is too low, so that the back pressure is reduced by spraying temperature reduction, and the operation requirement of the unit cannot be met in extremely hot weather. In order to solve the problem, the forced cooling system comprises a plurality of spraying units, each air cooling unit corresponds to one spraying unit, each spraying unit comprises an inner spraying part and an outer spraying part, the inner spraying parts are arranged in air cooling unit chambers, and the outer spraying parts are arranged outside the air cooling unit chambers.

Description

Technical Field

[0001] The utility model belongs to the technical field of air cooling island temperature reduction, in particular to an air cooling island forced cooling system for a direct air cooling unit. Background Art

[0002] Direct air-cooling technology is primarily used to conserve water. It is suitable for dry or arid climates, at coal mine entrances, and other areas with extremely limited water resources and high water costs. It is also suitable for urban areas where space constraints preclude the construction of wet cooling towers. Existing unit operations demonstrate that direct air-cooling units use 85% or more less water than water-cooled generator sets. While air-cooling systems have proven relatively reliable over decades of operation, they also present inherent challenges, such as low efficiency, high coal consumption, and poor summer peak load performance. High summer temperatures can reduce the vacuum in air-cooled units, reducing power generation efficiency and even forcing the entire unit to operate at reduced load.

[0003] Direct air-cooled generator sets have a greater impact on the operating back pressure of the units as the external environment changes in summer. When the external ambient temperature reaches above 28°C, the operating back pressure of the units will rise to 32KPa and above. Due to the increase in the back pressure of the units, the load-carrying capacity of the operating units is greatly restricted, and the flexible peak-shaving of the operating units is also affected. At present, when the external ambient temperature of direct air-cooled generator sets rises to a certain level, the spray cooling device is started to reduce the operating back pressure of the units. However, in extremely hot weather, the current spray cooling device still fails to achieve the expected energy-saving effect after being put into operation. From the analysis of the current situation after the spray device was put into operation, the effective utilization efficiency of the existing spray cooling water is too low, resulting in the spray cooling to reduce the back pressure cannot meet the unit operation requirements in extremely hot weather.

[0004] Secondly, the current atomization cooling system only lowers the indoor air temperature of the air-cooling unit, but does not directly spray the atomized cooling water onto the surface of the air-cooling island's heat pipes. As a result, the cooling effect is not very good and cannot meet the load capacity of the generator set in the extremely hot summer temperatures. At the same time, the cooling water cooling efficiency is low, resulting in a large amount of desalted water being wasted. Utility Model Content

[0005] In order to solve this problem, on the one hand, the spray cooling design of the internal spray device of the heat dissipation unit of the air cooling device is a side-flow flat nozzle. The purpose of this design is that the atomized cooling water sprayed by the nozzle can be directly sprayed onto the surface of the heat dissipation pipe of the air cooling device to achieve the purpose of direct cooling. At the same time, after this design modification, the cooling water put into operation can be fully utilized; on the other hand, a strong cooling and cooling device is installed at a height of 1.2-1.5 meters on the upper part of the external surface of the heat dissipation surface of the air cooling device unit. The external interface strong cooling and cooling device is designed with a direct spray nozzle with a spray outer diameter of 1.2-1.5 meters. The two sets of strong cooling systems inside and outside the air cooling device can be put into operation independently. The strong cooling system outside the air cooling device can be put into operation in an extremely hot environment, which can achieve the purpose of quickly reducing the surface temperature of the heat dissipation pipe of the air cooling device in extremely hot weather in summer, so as to meet the flexible peak load-shaving capacity of the operating unit. After the non-cooling devices inside and outside the air cooling device are put into operation, the back pressure of the operating unit can be reduced to more than 5Kpa under extremely hot temperatures in summer, meeting the ability of the unit to carry rated load at any time.

[0006] The technical solution adopted by this utility model:

[0007] A forced cooling system for an air-cooling island of a direct air-cooling unit, the forced cooling system comprising a plurality of spray units, each air-cooling unit corresponding to a spray unit, the spray unit comprising an inner spray part and an outer spray part, the inner spray part being arranged inside the air-cooling unit room, and the outer spray part being arranged outside the air-cooling unit room.

[0008] In the above technical solution, the internal spray part includes a nozzle A and multiple internal branch pipes. The multiple internal branch pipes are divided into two groups and evenly distributed on the symmetrical heat dissipation fin tubes on both sides of the air cooling unit. Two nozzles A are provided on each internal branch pipe. The bottoms of the multiple internal branch pipes on the same side are connected to one internal pipe. The two ends of the two internal pipes are connected to the water inlet pipe. The adjacent internal pipes are connected in sequence through the water inlet pipe to form an internal main pipe, and a valve A is provided on each section of the water inlet pipe.

[0009] In the above technical solution, further, the nozzles A on adjacent inner branch pipes are staggered in an upper and lower arrangement.

[0010] 10. In the above technical solution, further, the nozzle A adopts a side-flow flat nozzle, and the spray direction of the side-flow flat nozzle is toward the heat dissipation fin tube.

[0011] In the above technical solution, further, 16 side-flow flat nozzles are provided, 8 on each inner side of two symmetrical heat-dissipating fin tubes, and 8 internal branch pipes are provided, each with a diameter of 15 mm. The spacing between adjacent internal branch pipes on the same side is 2 m, and the branch pipes are fixed with triangular brackets.

[0012] In the above technical solution, further, the external spray part includes multiple nozzles B and multiple external branch pipes, each external branch pipe is provided with two nozzles B, and the multiple external branch pipes are evenly distributed on the outside of the two symmetrical heat dissipation fin tubes of the air cooling unit. The bottom of the external branch pipe on the same side is connected to one external pipe, the two external pipes are parallel, and their inlets are provided with valves B, and the external pipes on the same side are connected in sequence to form an external main pipe.

[0013] In the above technical solution, further, nozzle A adopts a spiral flow type solid cone nozzle, and two nozzles B are set on each external branch pipe. The two nozzles are staggered in the upper and lower rows. The spray direction of the spiral flow type solid cone nozzle is toward the heat dissipating fin tube, and is 1.2-1.5m away from the outer surface of the heat dissipating fin tube.

[0014] In the above technical solution, further, 16 spiral flow type solid cone nozzles are provided, 8 on each outer side of two symmetrical heat dissipation fin tubes, and the 8 spiral flow type solid cone nozzles are distributed on the outer surface of the same side of the heat dissipation fin tube in two rows and four columns.

[0015] In the above technical solution, further, the inner main pipeline and the two outer main pipelines are connected to the main pipeline, the main pipeline is connected to the water pump, the water pump and valve A and valve B are all connected to the field controller, and the field controller communicates wirelessly with the remote control terminal in the control room.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The utility model implements the transformation of the internal spray device of the heat dissipation unit of the air cooling device, and designs the nozzle of the spray cooling device inside the air cooling unit as a side flow flat nozzle with a nozzle flow rate of 1L / min. The number of nozzles designed for the spray cooling device inside each unit is 16, and the installation method is staggered and dispersed up and down to ensure the cooling effect after the spray is put into operation.

[0018] 2. A strong cooling spray device is installed on the outside of the air cooling unit. Seven nozzles with a flow rate of 1.5L / min and one with a flow rate of 1.2L / min are installed 1.2-1.5 meters away from the outer surface of the heat dissipation unit. The spiral flow type solid cone nozzle has a spray outer diameter of 1.2-1.5 meters. When the external ambient temperature is particularly high, the external strong cooling spray device can be put into operation to meet the load capacity of the operating unit.

[0019] 3. The internal spray parts and external spray parts designed by the utility model are put into operation independently. In an extremely hot environment, the strong cooling system outside the air-cooling device can be put into operation, which can achieve the purpose of quickly reducing the surface temperature of the heat dissipation pipe of the air-cooling device in extremely hot weather in summer, so as to meet the flexible peak load regulation capacity of the operating unit. After the non-cooling devices inside and outside the air-cooling device are put into operation, the back pressure of the operating unit can be reduced to more than 5Kpa in the extremely hot temperature in summer, so as to meet the ability of the unit to carry the rated load at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the distribution of internal spray parts inside the air cooling unit.

[0022] Figure 2 Schematic diagram of the distribution of external spray parts outside the air cooling unit.

[0023] Among them, 1. Side flow type flat nozzle; 2. Internal branch pipe; 3. Internal pipe; 4. Water inlet pipe; 5. Valve A; 6. Spiral flow type solid cone nozzle; 7. External branch pipe; 8. External main pipe; 9. Valve B. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0026] The two air-cooling units have a significant impact on the operating back pressure of the units as the external environment changes. When the external ambient temperature reaches above 28°C, the operating back pressure of the units will rise to 32KPa and above. Due to the increase in the back pressure of the units, the load-carrying capacity of the operating units is greatly restricted, and the flexible peak-shaving of the operating units is also affected. When the external ambient temperature rises to a certain level, the spray cooling device is generally started to reduce the operating back pressure of the units. However, in extremely hot weather, the current spray cooling device still fails to achieve the expected energy-saving effect after being put into operation. From the analysis of the current situation after the spray device was put into operation, the effective utilization efficiency of the existing spray cooling water is too low, resulting in the spray cooling to reduce the back pressure cannot meet the unit operation requirements in extremely hot weather.

[0027] Based on this, the air-cooling island forced cooling system designed in this application mainly includes: remote control terminal in the control room, field controller, pipelines and water pumps, valve bodies, and nozzles.

[0028] The atomizing nozzle includes a side flow type flat nozzle 1 and a spiral flow type solid cone nozzle 6.

[0029] Side-flow flat nozzles 1 are installed inside the air-cooling unit. Specifically, there are 16 side-flow flat nozzles 1, corresponding to 8 internal branch pipes 2. These eight internal branch pipes 2 are evenly distributed on the symmetrical heat-dissipating fin tubes on both sides of the air-cooling unit, close to the heat-dissipating fin tubes and fixed with triangular brackets. Adjacent internal branch pipes 2 on the same side are installed with a spacing of 2 meters. The diameter of the internal branch pipes 2 is 15mm. Each internal branch pipe 2 is equipped with two side-flow flat nozzles 1. The spray direction of the two nozzles A is toward the heat-dissipating fin tubes on both sides. The two adjacent sets of side-flow flat nozzles 1 are staggered vertically to ensure the cooling effect after the spray is put into operation.

[0030] Among them, 14 side flow type flat nozzles 1 with a specification of 1.2 liters / minute (flow rate) are designed, and 2 side flow type flat nozzles 1 with a specification of 1.0 liters / minute are designed. Figure 1 The bottoms of the four internal branch pipes 2 on the same side are connected to one internal pipe 3, and the two ends of the two internal pipes 3 are connected to the water inlet pipe 4. The adjacent internal pipes 3 are connected in sequence through the water inlet pipe 4 to form an internal main pipe, and a valve A5 is provided at each section of the water inlet pipe 4.

[0031] The spiral flow type solid cone nozzle 6 is arranged outside the air cooling unit. Figure 2 As shown, each air-cooling unit is equipped with eight external branch pipes 7 on the outside. Four external branch pipes 7 are installed on the external heat dissipation surfaces of each of the two heat dissipation units of the air-cooling unit. Each external branch pipe 7 is equipped with two spiral flow-type solid cone nozzles 6 in staggered rows, with the spray direction of these two spiral flow-type solid cone nozzles 6 directed toward the heat dissipation fins. Each external branch pipe 7 is horizontally spaced 2 meters apart and has a diameter of 15 mm. The bottoms of the four external branch pipes 7 on the same side are connected to a single external pipe. The two external pipes are parallel and have valves B9 installed at their inlets. The external pipes on the same side are connected in sequence to form the external main pipe 8.

[0032] Nozzle specifications: 7 nozzles with a flow rate of 1.5 L / min, 1 nozzle with a flow rate of 1.2 L / min. Six spiral flow solid cone nozzles with a spray diameter of 1.2-1.5 meters. When the external ambient temperature is extremely high, an external strong cooling spray device can be put into operation to meet the load capacity of the operating unit.

[0033] The spiral flow type solid cone nozzle 6 and the side flow type flat nozzle 1 are both fixed to the outer branch pipe 7 or the inner branch pipe 2 by screws, and the branch pipes are fixedly supported by triangular brackets.

[0034] The two external main pipes 8 outside and inside the air cooling unit and one internal main pipe are connected to the water pump through the main pipe. The water pump supplies water, and the water pump and all valve bodies are connected to the field controller. The field controller communicates wirelessly with the remote control terminal in the control room. The field controller is installed near the water pump, about 1m away, and the field controller is controlled by the remote control terminal in the control room to start and stop the water pump and valve.

[0035] In this embodiment, valves A5 and B9 are numbered and connected to a field controller. The field controller controls the opening or closing of valves A5 and B9. Wireless communication, such as WIFI, 4G, or 5G network communication, can be used between the field controller and the remote control terminal. The control principle and communication method of this part adopt existing technology (the principle of which can be referenced by farmland irrigation technology) and are not the improvement of this application. The improvement of this application mainly lies in the distribution of the spiral flow type solid cone nozzle 6 and the side flow type flat nozzle 1, as well as the layout of the spray parts inside and outside the air cooling unit. Therefore, the remote control terminal and the field controller will not be described in detail here.

[0036] Working principle:

[0037] The side-flow flat nozzle is rationally arranged between the air-cooling island fan and the heat dissipation fin. The atomized water sprayed by the side-flow flat nozzle is in full contact with the air to form an air-water mixture, which reduces the ambient temperature and humidity of the surrounding local space. The heat dissipation fan then brings the humidified and cooled air-water mixture to the surface of the radiator tube bundle and attaches it to the surface of the radiator tube bundle. The heat on the radiator surface is removed by the rapid evaporation of the attached water mist, thereby quickly reducing the air temperature and the tube bundle surface temperature. A strong cooling device is installed at a height of 1.2-1.5 meters on the upper part of the external surface of the heat dissipation surface of the air-cooling unit. The external interface strong cooling device is designed with a direct spray nozzle with a spray outer diameter of 1.2-1.5 meters. The two sets of strong cooling systems inside and outside the air-cooling device can be put into operation independently. The strong cooling system outside the air-cooling device can be put into operation in an extremely hot environment. It can achieve the purpose of quickly reducing the surface temperature of the heat dissipation pipe of the air-cooling device in extremely hot weather in summer, so as to meet the flexible peak load capacity of the operating unit. After the non-cooling devices inside and outside the air-cooling device are put into operation, the back pressure of the operating unit can be reduced to more than 5Kpa under extremely hot temperatures in summer, so as to meet the ability of the unit to carry rated load at any time.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment based on the technical essence of the utility model shall still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A direct air-cooling unit air-cooling island forced cooling system, characterized in that: The forced cooling system includes a plurality of spray units, each air cooling unit corresponds to a spray unit, and the spray unit includes an inner spray part and an outer spray part. The inner spray part is arranged inside the air cooling unit room, and the outer spray part is arranged outside the air cooling unit room.

2. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 1 is characterized in that: The internal spray parts include nozzles A and multiple internal branch pipes. The multiple internal branch pipes are divided into two groups and evenly distributed on the symmetrical heat dissipation fin tubes on both sides of the air cooling unit. Two nozzles A are provided on each internal branch pipe. The bottoms of the multiple internal branch pipes on the same side are connected to one internal pipe. The two ends of the two internal pipes are connected to the water inlet pipe. The adjacent internal pipes are connected in sequence through the water inlet pipe to form an internal main pipe, and a valve A is provided on each section of the water inlet pipe.

3. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 2 is characterized in that: The nozzles A on the adjacent inner branch pipes on the same side are staggered up and down.

4. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 3 is characterized in that: Nozzle A is a side-flow flat nozzle, and the spray direction of the side-flow flat nozzle is toward the heat dissipation fin tube.

5. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 4 is characterized in that: There are 16 side-flow flat nozzles, 8 on each side of the two symmetrical heat-dissipating fin tubes, and 8 internal branch pipes with a diameter of 15 mm. The spacing between adjacent internal branch pipes on the same side is 2 m, and the branch pipes are fixed with triangular brackets.

6. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 2 is characterized in that: The external spray parts include multiple nozzles B and multiple external branch pipes. Each external branch pipe is equipped with two nozzles B. The multiple external branch pipes are evenly distributed on the outside of the two symmetrical heat dissipation fin tubes of the air cooling unit. The bottom of the external branch pipe on the same side is connected to one external pipe. The two external pipes are parallel and their inlets are both equipped with valves B. The external pipes on the same side are connected in sequence to form an external main pipe.

7. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 6, characterized in that: Nozzle A adopts a spiral flow type solid cone nozzle. Two nozzles B are set on each external branch pipe. The two nozzles are staggered up and down. The spray direction of the spiral flow type solid cone nozzle is toward the heat dissipation fin tube and is 1.2-1.5m away from the outer surface of the heat dissipation fin tube.

8. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 6, characterized in that: There are 16 spiral flow type solid cone nozzles, 8 of which are located on the outside of two symmetrical fin tubes. The 8 spiral flow type solid cone nozzles are distributed on the outer surface of the same side of the fin tube in the form of two rows and four columns.

9. The air-cooling island forced cooling system of a direct air-cooling unit according to claim 5, characterized in that: The inner main pipeline and the two outer main pipelines are connected to the main pipeline, the main pipeline is connected to the water pump, the water pump and valve A and valve B are all connected to the field controller, and the field controller communicates wirelessly with the remote control terminal in the control room.

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