Cooling water circulation pump system

Abstract

The invention relates to a cooling water circulation pump system. At present, no cooling water circulation pump system with a simple structure, reasonable design, low manufacture cost, capability of flexibly adjusting a circulating water amount, and facility of energy saving and consumption reduction exits. The cooling water circulation pump system comprises at least two circulation pumps which are mutually connected in parallel, and is characterized in that a valve is arranged in the inlet and/or the outlet of each circulation pump; each circulation pump is provided with a same designed lift, but with different designed flows; and a motor with a fixed rotation speed is used for driving each circulation pump to operate at a set speed, thus the cooling water circulation pump system has the function of stepping flow adjustment from the minimum circulation water flow to the maximum circulation water flow, and the requirement for flow adjustment of circulation cooling water in different seasons and different working conditions is met. The cooling water circulation pump system has the advantages of reasonable structure, low manufacture cost, capability of flexibly adjusting the circulating water amount, and facility of energy saving and consumption reduction.

Description

technical field [0001] The invention relates to a cooling water circulating pump system, which is mainly suitable for circulating cooling water systems of power plants, auxiliary cooling water systems of power plants, and cooling water systems in other industrial fields. Background technique [0002] In recent years, due to the sharp rise in coal prices, the cost of power generation of thermal power plants has increased significantly, while the increase in the on-grid electricity price of thermal power plants has been limited, resulting in smaller and smaller profit margins for thermal power companies. Reducing the cost of power generation and saving energy consumption has become the internal demand of power generation enterprises. [0003] The circulating cooling water of coal-fired power plants is usually driven by several circulating pumps running in parallel. For example, the cooling water of 300MW-level generator sets usually uses two parallel-connected 50% mass flow ci...

AI Technical Summary

Problems solved by technology

Although this method has the advantages of relatively flexible adjustment, the investment of high-power inverter equipment is large and the maintenance is complicated, and when the circulating pump is running at a low speed, that is, it is not in the best design operating condition, the efficiency of the circulating pump will be affected to a certain extent. The influence of the pump increases the energy consumption of the pump, which is not conducive to energy saving and consumption reduction

[0006] To sum up, there is no cooling water circulating pump system with simple structure, reasonable design, low manufacturing cost, flexible adjustment of circulating water volume, and energy saving and consumption reduction.

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