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Dry-wet Combined Cooling Tower Using Natural Ventilation and Composite Operation Mode and Its Application

A composite operation mode, natural ventilation technology, applied in water shower coolers, direct contact heat exchangers, heat exchanger types, etc., can solve the problems of increased steam turbine back pressure, reduced unit economy, and high steam turbine back pressure. , to achieve the effect of increasing heat release, saving water replenishment, and lowering the water temperature out of the tower

Active Publication Date: 2017-11-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the Harmon-type indirect cooling system, the circulating cooling water needs to undergo two heat exchanges, and the heat transfer effect is poor. Under the same design temperature conditions, the back pressure of the steam turbine is high, and the unit economy is low.
The Heller-type indirect cooling system uses a hybrid condenser, and there are many equipments, the system is complex, and a large amount of refined water is required, and the cost of water treatment is high
In summer, when the dry bulb temperature of the ambient air is high, the heat transfer temperature difference between the above three air cooling systems and the ambient air decreases, resulting in an increase in the back pressure of the steam turbine in the power plant and a decrease in the unit economy

Method used

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  • Dry-wet Combined Cooling Tower Using Natural Ventilation and Composite Operation Mode and Its Application
  • Dry-wet Combined Cooling Tower Using Natural Ventilation and Composite Operation Mode and Its Application
  • Dry-wet Combined Cooling Tower Using Natural Ventilation and Composite Operation Mode and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: Full Series Operation

[0045] When the ambient meteorological conditions are high temperature and high humidity, the heat transfer conditions are poor. To make full use of the cooling capacity of the dry cooling section and the wet cooling section, the dry cooling section and the wet cooling section can be operated in series to make the tower water temperature meet the requirements. see figure 1 and figure 2 , in the flow distribution system, valves A, B and E are fully open, valves C and D are fully closed, and shutters 3 in the dry-cooling section and shutters 16 in the wet-cooling section are open.

[0046] The circulating cooling water used to cool the condensed steam of the steam turbine first passes through the cooling triangular finned tube bundle of the dry cooling section to exchange heat with the air, and then all reaches the water distribution system 5 of the wet cooling section, and then passes through the lower packing area 6 and the rain area...

Embodiment 2

[0047] Example 2: Full Parallel Operation

[0048] When the ambient meteorological conditions are relatively high and there are more water resources available, the parallel operation mode of the dry cooling section and the wet cooling section can be adopted to make the tower water temperature meet the requirements. see figure 1 and figure 2 , in the flow distribution system, valve A, valve C, valve D and valve E are open, valve B is completely closed, and the shutters 3 in the dry-cooling section and the shutters 16 in the wet-cooling section are open.

[0049] The cooling water from the steam turbine condenser passes through the dry cooling section and the wet cooling section independently, and the flow ratio of the two parts can be adjusted by the opening of the valve. In the dry cooling section, the cooling water exchanges heat with the air in the cooling triangular finned tube bundle 2; in the wet cooling section, the cooling water enters the water distribution system 5...

Embodiment 3

[0050] Example 3: first run in series and then run in parallel

[0051] When the ambient temperature is relatively high but the water resources are scarce, the operation mode in which all the flow passes through the dry cooling section and part of the flow passes through the wet cooling section can be adopted. see figure 1 and figure 2 , in the flow distribution system, valve A and valve E are fully open, valve C is fully closed, valve B and valve D are in a certain opening state, and the louvers 3 of the dry-cooling section and the louvers 16 of the wet-cooling section are open.

[0052] The entire flow of cooling water from the steam turbine condenser passes through the dry cooling section 2 to exchange heat with the air in the cooling tower, and then part of the flow continues to exchange heat with the air through the wet cooling section, and then this part of the flow is compared with the flow that does not flow through the wet cooling section Export after mixing.

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Abstract

The invention belongs to the technical field of energy utilization and engineering thermophysics, and in particular relates to a combined dry-wet cooling tower adopting natural ventilation and combined operation mode and its application. The dry-wet combined cooling tower includes a tower body, a supporting structure, a dry cooling section, a wet cooling section and a flow distribution system; the tower body is in the form of a hyperbola, supported on the ground by a supporting structure; the dry cooling section and the wet cooling section are vertically Integrated in the same cooling tower; the dry-cooling section is located above the wet-cooling section; the dry-cooling section includes cooling triangles and dry-cooling section louvers; the wet-cooling section includes water eliminators, water distribution systems, filling areas, sumps and wet-cooling section louvers The flow distribution system includes the total inlet and outlet pipelines, the inlet and outlet pipelines of the dry cooling section, the inlet and outlet pipelines of the wet cooling section, valves and circulating pumps. The invention does not require fan power consumption, has high cooling efficiency, can provide lower water temperature out of the tower, and saves water resources.

Description

technical field [0001] The invention belongs to the technical field of energy utilization and engineering thermophysics, and specifically relates to a dry-wet combined cooling tower adopting natural ventilation and combined operation mode and its application. Background technique [0002] In the fields of energy, electric power, chemical industry, steel, pharmaceuticals, etc., there are many production links that must be cooled in time to ensure continuous and stable operation of the production process. [0003] Taking thermal power generation as an example, cooling the exhaust steam of the steam turbine into condensed water is not only a crucial process in the steam power cycle, but also the effect of cooling (cooling rate, heat release temperature) will also affect the efficiency of the power cycle. Good cooling can improve the energy utilization rate of thermal power generation and realize energy saving and emission reduction in power production. [0004] Traditional the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28C1/14
Inventor 陈林杜小泽黄钰琛杨立军魏高升张辉李莉杨勇平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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