Peak cooling system based on indirect air cooling unit

Abstract

The present invention relates to a peak cooling system based on an indirect air-cooling unit, comprising an air-cooling unit condenser, an air-cooling unit cooling tower, and a water-cooling unit condenser; the air-cooling unit condenser is connected to the air-cooling unit cooling tower through a circulating water pipeline, the circulating water pipeline comprises a first pipeline and a second pipeline, the cooling circulating water in the first pipeline flows from the air-cooling unit cooling tower to the air-cooling unit condenser, and the cooling circulating water in the second pipeline flows from the air-cooling unit condenser to the air-cooling unit cooling tower; the second pipeline is connected with at least one heat exchange branch, the heat exchange branch is provided with a heat exchanger, the inlet of the heat exchanger is connected to the outlet of the air-cooling unit condenser and the outlet of the water-cooling unit condenser, and the outlet of the heat exchanger is connected to the air-cooling unit cooling tower. The present invention can effectively recover the waste heat of the indirect air-cooling unit, and at the same time reduce the exhaust pressure of the air-cooling unit, so as to achieve the purpose of energy saving and consumption reduction.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery in thermal power plants, and in particular to a peak cooling system based on an indirect air cooling unit. Background Art

[0002] Under the general trend of energy conservation and emission reduction, waste heat recovery and air-cooled steam turbine exhaust cooling of thermal power plant groups are imperative. There are more and more power plant waste heat recovery and air-cooled steam turbine exhaust cooling projects, with large investments and high operating costs.

[0003] In view of the above-mentioned defects, the designers have actively carried out research and innovation, aiming to create an air-cooled power plant waste heat utilization system for power plants with air-cooled units and water-cooled units, so as to achieve the goal of energy saving and consumption reduction. Summary of the invention

[0004] The purpose of the present invention is to provide a peak cooling system based on an indirect air-cooling unit. For a power plant with both an indirect air-cooling unit and a water-cooling unit, the system can effectively recover the waste heat of the indirect air-cooling unit and reduce the exhaust steam pressure of the air-cooling unit, thereby achieving the purpose of energy saving and consumption reduction.

[0005] The present invention provides a peak cooling system based on an indirect air-cooling unit, comprising an indirect air-cooling unit and a water-cooling unit, wherein the indirect air-cooling unit comprises an air-cooling unit condenser and an air-cooling unit cooling tower, and the water-cooling unit comprises a water-cooling unit condenser;

[0006] The condenser of the air-cooling unit is connected to the cooling tower of the air-cooling unit through a circulating water pipeline. The circulating water pipeline includes a first pipeline and a second pipeline. The cooling circulating water in the first pipeline flows from the cooling tower of the air-cooling unit to the condenser of the air-cooling unit. The cooling circulating water in the second pipeline flows from the condenser of the air-cooling unit to the cooling tower of the air-cooling unit.

[0007] The second pipeline is connected to at least one heat exchange branch, and the heat exchange branch is provided with a heat exchanger. The inlet of the heat exchanger is connected to the condenser outlet of the air-cooling unit and the condenser outlet of the water-cooling unit. The outlet of the heat exchanger is connected to the cooling tower of the air-cooling unit. The heat exchange branch is used to cool the cooling circulating water of the indirect air-cooling unit through the condensed water of the water-cooling unit, and heat the condensed water through the cooling circulating water.

[0008] Furthermore, the first pipeline is provided with an air-cooling unit circulating water pump and a valve.

[0009] Furthermore, the inlet pipe and the outlet pipe of the heat exchanger are provided with valves.

[0010] Furthermore, the outlet of the condenser of the water-cooling unit is connected to the inlet of the heat exchanger through a condensate pipe of the water-cooling unit.

[0011] Furthermore, the condensate water pipeline of the water-cooling unit is provided with a valve and a condensate water pump of the water-cooling unit.

[0012] Furthermore, the heat exchanger outlet is also connected to the low-pressure heater of the water cooling unit.

[0013] Furthermore, the cooling tower of the air-cooling unit is an indirect circulating water cooling tower.

[0014] Furthermore, the condenser is a water-cooled condenser or an air-cooled condenser.

[0015] Furthermore, the condenser is a partition type condenser or a contact type condenser.

[0016] Furthermore, the heat exchanger is one of a partition heat exchanger, a fluid-connected indirect heat exchanger, a direct contact heat exchanger, and a compound heat exchanger.

[0017] Through the above scheme, through the peak cooling system based on the indirect air-cooling unit, the waste heat of the indirect air-cooling unit can be effectively recovered, and the exhaust steam pressure of the air-cooling unit can be reduced, thereby achieving the purpose of energy saving and consumption reduction.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the peak cooling system based on the indirect air cooling unit of the present invention.

[0020] Numbers in the figure:

[0021] 1- Low-pressure cylinder of steam turbine of air-cooled unit; 2- Low-pressure heater of air-cooled unit; 3- Condenser of air-cooled unit; 4- Condensate pump of air-cooled unit; 5- Cooling tower of air-cooled unit; 6- First pipeline; 7- Second pipeline; 8- Circulating water pump of air-cooled unit; 9- Low-pressure cylinder of steam turbine of water-cooled unit; 10- Low-pressure heater of water-cooled unit; 11- Condenser of water-cooled unit; 12- Condensate pipeline of water-cooled unit; 13- Heat exchanger; 14- Condensate pump of water-cooled unit; 15- Valve. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] Ginseng Figure 1As shown, this embodiment provides a peak cooling system based on an indirect air-cooling unit, including an indirect air-cooling unit and a water-cooling unit, the indirect air-cooling unit includes an air-cooling unit condenser 3 and an air-cooling unit cooling tower 5, and the water-cooling unit includes a water-cooling unit condenser 11; the air-cooling unit condenser 3 is connected to the air-cooling unit cooling tower 5 through a circulating water pipeline, the circulating water pipeline includes a first pipeline 6 and a second pipeline 7, and the cooling circulating water in the first pipeline 6 flows from the air-cooling unit cooling tower 5 to the air-cooling unit condenser 3, the cooling circulating water in the second pipeline 7 flows from the air-cooling unit condenser 3 to the air-cooling unit cooling tower 5; the second pipeline 7 is connected to at least one heat exchange branch, the heat exchange branch is provided with a heat exchanger 13, the inlet of the heat exchanger 13 is connected to the outlet of the air-cooling unit condenser 3 and the outlet of the water-cooling unit condenser 11, the outlet of the heat exchanger 13 is connected to the air-cooling unit cooling tower 5, the heat exchange branch is used to cool the cooling circulating water of the indirect air-cooling unit through the condensed water of the water-cooling unit, and heat the condensed water through the cooling circulating water. The water-cooling unit can be two or more units.

[0024] The peak cooling system based on the indirect air-cooling unit introduces the cooling circulating water of the air-cooling unit into the condensate of the water (wet) cooling unit, and uses the condensate of the water-cooling unit to cool the circulating water of the air-cooling unit through a heat exchanger, and heats the condensate of the water-cooling unit at the same time. In this way, the exhaust steam of the air-cooling unit is cooled, and the condensate of the water-cooling unit is heated at the same time, thereby realizing the exhaust steam cooling of the air-cooling unit and the condensate heating of the water-cooling unit at the same time, realizing the waste heat utilization of the air-cooling power plant, and achieving the purpose of energy saving and consumption reduction.

[0025] In this embodiment, the first pipeline 6 is provided with an air-cooling unit circulating water pump 8 and a valve 15 .

[0026] In this embodiment, the inlet pipe and the outlet pipe of the heat exchanger 13 are provided with valves 15 .

[0027] In this embodiment, the outlet of the water-cooling unit condenser 11 is connected to the inlet of the heat exchanger 13 through the water-cooling unit condensate pipeline 12 .

[0028] In this embodiment, the water-cooling unit condensate water pipeline 12 is provided with a valve 15 and a water-cooling unit condensate water pump 14 .

[0029] In this embodiment, the outlet of the heat exchanger 13 is also connected to the low-pressure heater 10 of the water-cooled unit.

[0030] In this embodiment, the air-cooling unit cooling tower 5 is an indirect circulating water cooling tower.

[0031] In this embodiment, the condenser (the condenser 3 of the air-cooled unit and the condenser 11 of the water-cooled unit) is a water-cooled condenser or an air-cooled condenser.

[0032] In this embodiment, the condenser is a partition type condenser or a contact type condenser.

[0033] In this embodiment, the heat exchanger 13 is one of a partition heat exchanger, a fluid-connected indirect heat exchanger, a direct contact heat exchanger, and a compound heat exchanger.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A peak cooling system based on an indirect air cooling unit, characterized in that: It includes an indirect air-cooling unit and a water-cooling unit, wherein the indirect air-cooling unit includes an air-cooling unit condenser and an air-cooling unit cooling tower, and the water-cooling unit includes a water-cooling unit condenser; The air-cooling unit condenser is connected to the air-cooling unit cooling tower through a circulating water pipeline, and the circulating water pipeline includes a first pipeline and a second pipeline, the cooling circulating water in the first pipeline flows from the air-cooling unit cooling tower to the air-cooling unit condenser, and the cooling circulating water in the second pipeline flows from the air-cooling unit condenser to the air-cooling unit cooling tower; The second pipeline is connected to at least one heat exchange branch, the heat exchange branch is provided with a heat exchanger, the inlet of the heat exchanger is connected to the outlet of the condenser of the air-cooling unit and the outlet of the condenser of the water-cooling unit, the outlet of the heat exchanger is connected to the cooling tower of the air-cooling unit, the heat exchange branch is used to cool the cooling circulating water of the indirect air-cooling unit through the condensed water of the water-cooling unit, and heat the condensed water through the cooling circulating water; The outlet of the condenser of the water-cooled unit is connected to the inlet of the heat exchanger through the condensate pipeline of the water-cooled unit; the condensate pipeline of the water-cooled unit is provided with a valve and a condensate pump of the water-cooled unit; the outlet of the heat exchanger is also connected to the low-pressure heater of the water-cooled unit; the cooling tower of the air-cooled unit is an indirect circulating water cooling tower; the condenser is a water-cooled condenser or an air-cooled condenser; the condenser is a partition condenser or a contact condenser; The peak cooling system of the indirect air-cooling unit is used to introduce the cooling circulating water of the air-cooling unit into the condensed water of the water-cooling unit, and cool the circulating water of the air-cooling unit with the condensed water of the water-cooling unit through a heat exchanger, and heat the condensed water of the water-cooling unit at the same time, and heat the condensed water of the water-cooling unit while cooling the exhaust steam of the air-cooling unit, so as to achieve exhaust steam cooling of the air-cooling unit and condensed water heating of the water-cooling unit.

2. The peak cooling system based on the indirect air cooling unit according to claim 1 is characterized in that: The first pipeline is provided with an air cooling unit circulating water pump and a valve.

3. The peak cooling system based on the indirect air cooling unit according to claim 2 is characterized in that: The inlet pipe and the outlet pipe of the heat exchanger are provided with valves.

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