Heat supply network circulating water system of cogeneration unit and adjusting method

Abstract

The invention discloses a heat supply network circulating water system of a cogeneration unit and an adjusting method. The heat supply network circulating water system comprises a water supply pump turbine, a boiler water supply pump and a heat supply network circulating water pump, the boiler water supply pump and the heat supply network circulating water pump are coaxially arranged, the boiler water supply pump is connected into a boiler water supply pipeline, and the heat supply network circulating water pump is connected into a heat supply network circulating water supply pipeline; and the boiler water supply pump and the heat supply network circulating water pump are jointly driven by the water supply pump turbine, and boiler water supply and heat supply network circulating water supply are achieved at the same time. The adjusting method comprises the steps that when the outlet flow of the heat supply network circulating water pump is smaller than the total flow of heat supply network circulating water, a standby heat supply network circulating water pump is started, an outlet valve of the standby heat supply network circulating water pump is opened, and the sum of the outlet flow of the heat supply network circulating water pump and the outlet flow of the standby heat supply network circulating water pump meets the requirement of the total flow of heat supply network circulating water by adjusting the scoop tube opening degree of a hydraulic coupler. The equipment investment cost is reduced, and the capital construction investment of the initial station of the heat supply network is reduced.

Description

technical field [0001] The invention belongs to the field of heat supply and energy saving in thermal power plants, and relates to a heat network circulating water system and an adjustment method of a cogeneration unit. Background technique [0002] The driving methods of the heat network circulating water pump in cogeneration power plants include motor drive and steam turbine drive. Among them, the electric heat network circulating water pump system has a simple structure and is easy to repair and maintain, but the plant power consumption rate and power supply coal consumption are relatively high. The driving steam source of the steam-driven heating network circulating water pump is mostly drawn from the steam extraction pipeline of the main engine, and part of the steam extracted by the main engine heater enters the steam turbine of the heating network circulating water pump, drives the heating network circulating water pump to rotate, and the exhaust steam enters the steam...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a heat network circulating water system for cogeneration units to solve the problems of high power consumption rate, site infrastructure cost, equipment investment cost and maintenance cost in the prior art. The system and adjustment method can effectively reduce the power consumption rate of the heating plant and the investment cost of the first heating station, and at the same time reduce the amount of equipment maintenance during the maintenance period

Images