Backwater residual pressure energy closed-loop recycling circulating water delivery system and operation method

Abstract

The invention provides a circulating water delivery system capable of realizing closed-loop recovery of excess backwater pressure and an operation method, wherein the circulating water delivery system can be used for stably, promptly and completely transferring excess pressure recovered by a hydraulic turbine to a circulating water pump so as to reduce the power output by a motor and realize the closed-loop recovery of part of energy output by the motor. The circulating water delivery system comprises a circulating water tank (1), a cooling tower (2), a cooling tower water discharging tank (3), a heat exchanger and at least one double-driving energy-return circulating water pump (8) unit, wherein the circulating water tank (1) is communicated with the cooling tower water discharging tank (3); each double-driving energy-return circulating water pump (8) unit comprises a first overrunning shaft coupling (5), a second overrunning shaft coupling (6), a hydraulic turbine (7), a circulating water pump (8) and a motor (9); the circulating water pump (8) is communicated with the circulating water tank and the heat exchanger; the heat exchanger is communicated with the cooling tower (2); the hydraulic turbine (7) is communicated with the cooling tower (2) or a water return pipe (12); and the hydraulic turbine (7) is communicated with the cooling tower (2).

Description

technical field [0001] The invention relates to the technical field of industrial circulating water delivery devices, in particular to a circulating water delivery system and operation method for closed-loop recovery of residual pressure energy of return water, which is suitable for recovering the residual pressure energy of return water of circulating water. Background technique [0002] In the current conventional circulating water delivery pipe network system, the total energy consumption Q of the circulating water pump motor is generally equal to the sum of the energy consumption of the following six parts: Q total = Q1 + Q2 + Q3 + Q4 + Q5 + Q6, the above energy consumption The characteristics are as follows: [0003] [0004] In the energy consumption classification of the above-mentioned industrial circulating water delivery system, except that the energy consumption of Q3 and Q5 is fixed due to the fixed equipment and pipe network system and cannot be reduced or re...

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Problems solved by technology

[0007] Although there are continuous innovations in the use of hydraulic turbines (hydraulic turbines or turbines) to recover the residual pressure energy of the return water formed by the energy consumption of Q6 and Q2 in the above classification, a number of schemes have been formed, such as the existing ones that are used to replace cooling tower fan motor drives The practice of fan rotation to achieve energy saving is also used to drive the generator to generate electricity and output electric energy or to drive the motor to drive the circulating water pump to achieve energy saving. Furthermore, the above uses can be flexibly combined and intelligently switched to maximize the residual pressure of the circulating water. Patented design for stable recovery of energy, but the recovery of the residual pressure energy of the backwater formed by the energy consumption of Q6 and Q2 is limited to open-loop recovery, and the recovered energy cannot be directly fed back to the prime mover of the main circulation pump. On the other hand, the closed-loop recovery of the residual pressure energy of the return water cannot be realized; and when the temperature is low in winter and the high-speed operation of the fan is not required, part of the circulating water backwater is discharged through the low-level valve, and part of the pressure can be wasted

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