CN-224230754-U - Circulating water cooling system of thermal power plant

CN224230754UCN 224230754 UCN224230754 UCN 224230754UCN-224230754-U

Abstract

The application provides a circulating water cooling system of a thermal power plant, which is characterized in that a cooling system of a first unit and a cooling system of a second unit are communicated by arranging a hot circulating water communication pipe and a cold circulating water communication pipe, and the cooling system is controlled to be switched between a one-machine one-tower mode and a two-machine one-tower mode by a first valve and a second valve, so that the cooling requirement of the units can be met when the boiler units are under high load, and the purposes of energy saving and freezing prevention of the units can be realized when the boiler units are under low temperature and under low load. The system can effectively complete the cooling task of the boiler unit under different loads, and has the characteristics of easy control and convenient switching. In addition, the two indirect cooling towers are arranged in the application, and the two indirect cooling towers can be alternately used, and can also be independently used when the load of the boiler unit is large, thereby meeting the requirements of different working conditions.

Inventors

YANG ZHIBIN
FU QIANG
REN XIAOHONG
YIN DONGJIE
DUAN JUNFENG
WU HONGBO
LI QUANQUAN
GUO YANFEI
YANG PENG
WANG XUEQING
YU DABO

Assignees

内蒙古京宁热电有限责任公司

Dates

Publication Date: 20260512
Application Date: 20250617

Claims (7)

1. The circulating water cooling system of the thermal power plant is characterized by comprising a first unit (1), a second unit (2), a first indirect cooling tower (3) and a second indirect cooling tower (4); The first unit (1) is sequentially connected with a first hot circulating water pipeline (10), a first indirect cooling tower (3) and a first cold circulating water pipeline (20) to form a loop; The second unit (2) is sequentially connected with a second hot circulating water pipeline (30), a second indirect cooling tower (4) and a second cold circulating water pipeline (40) to form a loop; The first heat circulation water pipeline (10) is communicated with the second heat circulation water pipeline (30) through a heat circulation water communication pipe (50) provided with a heat circulation water pump (5); The first cold circulating water pipeline (20) and the second cold circulating water pipeline (40) are communicated through a cold circulating water connecting pipe (60) provided with a cold circulating water pump (6); A first check valve (100) is arranged between the connecting part of the first heat circulating water pipeline (10) and the heat circulating water connecting pipe (50) and the first unit (1); A second check valve (200) is arranged between the joint of the cold circulating water connecting pipe (60) and the second indirect cooling tower (4) on the second cold circulating water pipeline (40); A first valve (300) is arranged between the second check valve (200) and the second indirect cooling tower (4); And a second valve (400) is arranged between the connection part of the second heat circulation water pipeline (30) and the heat circulation water connecting pipe (50) and the second unit (2).
2. The circulating water cooling system of a thermal power plant according to claim 1, characterized in that the second hot circulating water line (30) and the second cold circulating water line (40) are connected by an internal circulating valve (500); The connection point of the internal circulation valve (500) at the second hot circulation water pipeline (30) is positioned between the second valve (400) and the second indirect cooling tower (4); the connection point of the internal circulation valve (500) at the second cold circulation water pipeline (40) is positioned between the first valve (300) and the second indirect cooling tower (4).
3. The circulating water cooling system of a thermal power plant according to claim 1, wherein the input end of the thermal circulating water pump (5) is connected with a first water pump protection valve (5100), and the output end is connected with a second water pump protection valve (5200); The input end of the cold circulating water pump (6) is provided with a third water pump protection valve (6100), and the output end of the cold circulating water pump is connected with a fourth water pump protection valve (6200).
4. The circulating water cooling system of a thermal power plant according to claim 1, wherein the first unit (1) comprises a boiler (11), a high-pressure cylinder (12), a medium-pressure cylinder (13), a low-pressure cylinder (14) and a condenser (15) which are sequentially connected in series into a loop; The medium pressure cylinder (13) and the low pressure cylinder (14) are connected through a first steam valve (1100); the medium pressure cylinder (13) is connected with the condenser (15) through a second steam valve (1200); The condenser (15) is also connected with a first hot circulating water pipeline (10) and a first cold circulating water pipeline (20).
5. The circulating water cooling system of a thermal power plant according to claim 1, characterized in that the first indirect cooling tower (3) comprises a body (31); A plurality of cooling sectors (32) are divided into the body (31), and the plurality of cooling sectors (32) are uniformly distributed along the circumferential direction of the body (31); Each cooling sector (32) is connected with a water inlet pipeline (3010) through a water inlet valve (3100), is connected with a water outlet pipeline (3020) through a water outlet valve (3200), and is connected with a groundwater tank (33) through at least one water outlet valve (3300); The water inlet pipeline (3010) is connected with a first heat circulation water pipeline (10); The water outlet line (3020) and a first cold recycle water line (20).
6. The circulating water cooling system of a thermal power plant according to claim 5, characterized in that an expansion tank (34) is further provided in the body (31); The expansion tank (34) is connected to the underground water tank (33) and the water outlet line (3020), respectively.
7. The circulating water cooling system of a thermal power plant according to claim 5, wherein the number of the cooling sectors (32) is 6-18.

Description

Circulating water cooling system of thermal power plant Technical Field The application relates to the technical field of thermal power generation, in particular to a circulating water cooling system of a thermal power plant. Background In the thermal power generating unit, a cooling system bears the heat dissipation task of the unit and consists of a final stage group of a low-pressure cylinder of a steam turbine, a condenser, a cooling tower, a circulating water pump, a circulating water supply system, an air extraction system and the like. In water-deficient areas, most of indirect air cooling systems taking indirect air cooling towers as main heat dissipation equipment of units are arranged in a one-machine-one-tower mode, and the next air cooling tower is only responsible for heat dissipation of one unit. However, under the influence of the peak-valley characteristics of the power grid users, frequency modulation peak regulation, system power flow, equipment overhaul, faults and other factors, the power generation of the thermal power plant often needs to be frequently regulated between medium and low loads and high loads, so that the cooling work of a cooling system also needs to be regulated accordingly. Therefore, a system capable of cooling the unit under different working conditions and different environmental temperatures is needed. Disclosure of utility model The application provides a circulating water cooling system of a thermal power plant, which is used for achieving the purpose of cooling tasks of a boiler unit under different loads. The application provides a circulating water cooling system of a thermal power plant, which comprises a first unit, a second unit, a first indirect cooling tower and a second indirect cooling tower; The first unit is sequentially connected with a first hot circulating water pipeline, a first indirect cooling tower and a first cold circulating water pipeline to form a loop; The second unit is sequentially connected with a second hot circulating water pipeline, a second indirect cooling tower and a second cold circulating water pipeline to form a loop; The first heat circulating water pipeline is communicated with the second heat circulating water pipeline through a heat circulating water communication pipe provided with a heat circulating water pump; the first cold circulating water pipeline and the second cold circulating water pipeline are communicated through a cold circulating water connecting pipe provided with a cold circulating water pump; A first check valve is arranged between the joint of the first heat circulation water pipeline and the first unit and positioned on the heat circulation water connecting pipe; A second check valve is arranged between the junction of the cold circulating water connecting pipe and the second indirect cooling tower on the second cold circulating water pipeline; A first valve is arranged between the second non-return valve and the second indirect cooling tower; And a second valve is arranged between the junction of the second heat circulation water pipeline and the heat circulation water connecting pipe and the second unit. Optionally, the second hot circulating water pipeline and the second cold circulating water pipeline are connected through an internal circulating valve; The connection point of the internal circulation valve at the second hot circulation water pipeline is positioned between the second valve and the second indirect cooling tower; the connection point of the internal circulation valve at the second cold circulation water pipeline is positioned between the first valve and the second indirect cooling tower. Optionally, the input end of the thermal circulating water pump is connected with a first water pump protection valve, and the output end of the thermal circulating water pump is connected with a second water pump protection valve; the input end of the cold circulating water pump is provided with a third water pump protection valve, and the output end of the cold circulating water pump is connected with a fourth water pump protection valve. Optionally, the first unit comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a condenser which are sequentially connected in series to form a loop; the medium pressure cylinder and the low pressure cylinder are connected through a first steam valve; the medium pressure cylinder is connected with the condenser through a second steam valve; the condenser is also connected with the first hot circulating water pipeline and the first cold circulating water pipeline. Optionally, the first indirect cooling tower comprises a body; The body is divided into a plurality of cooling sectors which are uniformly distributed along the circumferential direction of the body; each cooling sector is connected with a water inlet pipeline through a water inlet valve, is connected with a water outlet pipeline through a water outlet valve a