CN106225005A - A kind of Direct Air-Cooled tower waste heat circulation system - Google Patents

Abstract

The invention discloses a waste heat circulation system of a direct air-cooling tower, which is composed of a desalinated water tank, a filter screen, a high-pressure pump, a regulating valve and an air-cooling unit sequentially connected by pipelines. The air-cooling fan unit is a direct air-cooling tower composed of finned tubes inclined and a fan located below the interior of the air-cooling tower. There is also a nozzle above the fan, and the air flows to the interior of the air-cooling unit above through the nozzle; there is also a suction duct outside the direct air-cooling tower. The finned tubes are axially fixed above the space between the adjacent finned tubes, and there is a suction port under the suction duct. It is connected with the blower duct of the boiler. The hot air at the outlet of the direct air-cooled condenser is used for boiler combustion air, which realizes the circulation and reuse of the hot air at the outlet of the direct air-cooling tower, improves the utilization rate of fuel, reduces thermal pollution, and achieves the effect of energy saving and emission reduction.

Description

A direct air cooling tower waste heat circulation system

technical field

The invention belongs to the technical field of heat energy recovery equipment, is suitable for direct air-cooling generator sets, and in particular relates to a waste heat circulation system of a direct air-cooling tower.

Background technique

With the increasing scarcity of water resources in the world and the high attention to environmental protection issues, traditional thermal power water-cooled units are facing severe challenges due to the consumption of large amounts of water resources and certain negative impacts on the environment. In recent years, a large number of direct air-cooled generator sets have been put into operation in the northwestern region rich in coal and poor in water, which has alleviated the shortage of power generation caused by the lack of water resources in the local area, and has received good social benefits. The air-cooled unit adopts the air-condensing steam turbine to exhaust steam, which avoids the evaporation and wind loss of the circulating cooling water, and the air-cooled condenser has a low demand for water replenishment, and the water-saving effect is very obvious. Compared with wet-cooling circulating cooling units with the same capacity, the 300MW direct air-cooling unit reduces water resource consumption by 80%, and the 600MW direct air-cooling unit reduces water resource consumption by 75%. Therefore, in recent years, newly built power plants in Northwest my country mainly adopt the form of direct air cooling, which reduces the capital consumption of water resources in power plants. However, the temperature of the directly air-cooled air source has been greatly increased after passing through the water cooling system, and direct discharge into the atmosphere will cause certain heat pollution and waste a lot of heat sources. Therefore, it is meaningful to design a system to recover waste heat and use heat exchange. major.

Contents of the invention

Aiming at the above-mentioned defects in the prior art, the present invention provides a direct air cooling tower waste heat circulation system to realize the circulation and reuse of the outlet hot air of the direct air cooling tower. In conjunction with the accompanying drawings of the description, the technical solution of the present invention is as follows:

A direct air-cooling tower waste heat circulation system, which is composed of a desalinated water tank 1, a filter screen 2, a high-pressure pump 3, a regulating valve 4, and an air-cooling unit 7 connected sequentially by pipelines. The formed direct air cooling tower is composed of a fan 6 located below the interior of the air cooling tower. A nozzle 5 is also provided above the fan 6. The fan 6 sucks air at normal temperature from the outside, and the air flows through the nozzle 5 to the interior of the upper air cooling unit 7;

The air suction duct 9 is also provided outside the direct air cooling tower. The air suction duct 9 is arranged in parallel in multiple groups, and is respectively fixed above the space between the adjacent finned tubes 12 along the axial direction of the finned tubes 12. There is also a suction port 8 below the suction duct 9, and the waste heat air between the finned tubes 12 enters the suction duct 9 through the suction port 8, and the output end of the suction duct 9 is connected with the blower duct of the boiler.

A direct air-cooling tower waste heat circulation system, wherein the input end of the air suction pipe 9 is composed of two branch pipes, which are combined and then output from the same outlet. There are two air suction ports located below the air suction pipe 9 corresponding to The position of the space between the finned tubes 12 .

Compared with prior art, the beneficial effect of the present invention is:

The waste heat circulation system of the direct air-cooling tower of the present invention uses the hot air at the outlet of the direct air-cooling condenser for boiler combustion air, realizes the circulation and reuse of the hot air at the outlet of the direct air-cooling tower, and improves the utilization rate of fuel , reduce thermal pollution, and achieve the effect of energy saving and emission reduction. In addition, relying on this method can also solve the problem of hot air backflow in the air-cooled condenser to a certain extent, thereby achieving the purpose of alleviating low-temperature corrosion.

Description of drawings

Fig. 1 is the structural representation of a kind of direct air cooling tower waste heat circulation system of the present invention;

Fig. 2 is a structural schematic diagram of an air-cooling unit in a direct air-cooling tower waste heat circulation system of the present invention;

Fig. 3 is a schematic structural diagram of a suction circulation device in a waste heat circulation system of a direct air cooling tower according to the present invention.

In the picture:

1-demineralized water tank; 2-filter; 3-high pressure pump; 4-regulating valve;

5-nozzle; 6-fan; 7-air cooling unit; 8-suction port;

9-Suction duct; 10-Blower duct; 11-Condensate pipe; 12-Finned tube;

13 - Turbine initiation pipeline.

detailed description

As shown in Figure 1, the present invention discloses a direct air cooling tower waste heat circulation system. The front part of the system includes a desalinated water tank 1, a filter screen 2, a high pressure pump 3 and an air cooling unit 7 connected by pipelines in sequence, wherein the air cooling unit 7 Finned tubes are inclined to form a direct air-cooling tower structure. A regulating valve 4 is set between the high-pressure pump 3 and the inside of the air-cooling tower. The fan 6 is located below the air-cooling tower. There is a nozzle 5 above the fan 6. The fan 6 sucks air at normal temperature from the outside. In, the air flows through the nozzle 5 to the inside of the air cooling unit 7 above.

As shown in Figure 2, the air-cooling unit 7 located on the slope of the direct air-cooling tower is provided with a plurality of finned tubes 12 as condensers, and the upper ends of the finned tubes 12 are connected with the exhaust steam pipeline 13 of the steam turbine, and the finned tubes 12 The lower ends are all in communication with the condensed water pipeline 11. The exhaust steam of the steam turbine enters the exhaust steam pipe 13 of the steam turbine, passes through the finned tube 12, and the fan 7 blows the normal temperature air to the area below the finned tube 12, condenses the exhausted steam into condensed water, and flows out through the condensed water pipe 11, passes through the finned tube The ambient air temperature in the area also increases accordingly.

As shown in Figure 1, Figure 2 and Figure 3, a suction duct 9 is provided above the air cooling unit 7, and the suction ducts 9 are arranged in parallel, and are respectively fixed on the corresponding sides along the axial direction of the finned tubes 12 through brackets. The adjacent finned tubes 12 are spaced above. The input end of the suction duct 9 is composed of two branch ducts, which are output by the same outlet after merging. There are two air suction ports 8 below the air suction duct 9 corresponding to the space between the finned tubes 12 , as shown in positions A and B in the figure. As mentioned above, the fan 7 blows the normal-temperature air to the area below the finned tube 12, condenses the exhausted steam into condensed water, and flows out through the condensed water pipe 11, and the temperature of the normal-temperature air passing through the finned tube area also increases accordingly. Part of the waste heat air enters the suction duct 9 through the suction port 8 . The output end of the westerly track 9 is connected to the air duct 10 of the blower, and the waste heat air flows back to the boiler through the air duct of the blower.

The working process and principle of the technical solution of the present invention are as follows:

The exhaust steam of the steam turbine enters the exhaust steam pipe 13 of the steam turbine, and then enters the finned tube 12. The fan 7 blows air at normal temperature to the area below the finned tube 12, condenses the exhausted steam into condensed water, flows out through the condensed water pipe 11, and passes through the finned tube 12. The temperature of the normal temperature air in the tube area rises, and part of the waste heat air enters the suction pipe through the suction port 8, and finally flows back to the boiler through the air duct 10 of the blower fan to supply the boiler with air. So far, a complete direct air cooling tower waste heat circulation system has been formed.

Claims (2)

1. A direct air-cooling tower waste heat circulation system, consisting of desalinated water tank (1), filter screen (2), high-pressure pump (3), regulating valve (4) and air-cooling unit (7) connected by pipelines in sequence, its characteristics in: The air-cooling fan unit (7) is composed of a direct air-cooling tower formed by inclined finned tubes (12) and a fan (6) located below the inside of the air-cooling tower, and a nozzle (5) is arranged above the fan (6) , the fan (6) sucks air at normal temperature from the outside, and the air flows through the nozzle (5) to the inside of the upper air-cooling unit (7); Also be provided with suction duct (9) outside described direct air-cooling tower, described suction duct (9) is that multiple groups are arranged in parallel, is fixed on adjacent finned tube (12) axially along finned tube (12) respectively 12) Above the interval space, there is a suction port (8) under the suction duct (9), and the waste heat air between the finned tubes (12) enters the suction duct (9) through the suction port (8), so The output end of the suction duct (9) is docked with the blower duct of the boiler. 2. A kind of direct air cooling tower waste heat circulation system as claimed in claim 1, characterized in that: The input end of the suction pipe (9) is composed of two branch pipes, which are output from the same outlet after confluence. There are (2) suction ports, which are located below the suction pipe (9) and correspond to the finned tubes (12) The location of the spacer.