Waste heat utilization device of circulating fluidized bed heat supply unit slag cooler

Abstract

The invention discloses a waste heat utilization device of a slag cooler of a circulating fluidized bed heating unit. There is a heating network return water branch pipeline connected in parallel, and the heating network return water branch pipeline is connected with the slag cooler as a pipe for cooling water to enter the slag cooler, and the cooling water and the main road heat after the slag cooler absorbs heat The network return water is merged into one road to connect with the water inlet of the heating network heater. The heating network heater is connected to the four-exhaust steam extraction pipeline, and the temperature of the heating network return water is raised by heating and extraction, and the output of the heating network heater is The water outlet is connected to the water inlet pipe of the heating network through the pipeline, and the return water of the heating network reaches the temperature required for heating and is sent to the heat user. The invention has good heat recovery effect and good economy, the unit can generate more power, and the peak-shaving capability of the unit is improved.

Description

technical field [0001] The invention relates to the technical field of circulating fluidized bed boilers, in particular to a waste heat utilization device of a slag cooler of a circulating fluidized bed heating unit. Background technique [0002] Circulating fluidized bed units have developed very rapidly in recent years due to their advantages such as wide fuel adaptability, high-efficiency furnace desulfurization, and low NOx emissions. However, the slag discharge temperature of the circulating fluidized bed unit reaches above 850°C, and the heat loss of slag discharge is very large. If this part of heat can be recovered and utilized, the economic efficiency of the power plant can be greatly improved. At present, the commonly used method is to install a slag cooler at the slag discharge port, lead a path of condensed water to cool the slag cooler, and return the heat to the heat recovery system to improve the economy of the power plant. However, this way of waste heat uti...

AI Technical Summary

Problems solved by technology

However, this way of waste heat utilization is not very economical. Since the condensate is led out to the slag cooler, the amount of main condensate entering the bypass low-heater is reduced, and the corresponding amount of regenerative steam extraction is also reduced, which reduces the regenerative effect. , in addition, if the return water position of the slag cooler is improper, and the return water temperature is lower than the main condensate temperature at the inlet point, the effect of waste heat utilization will be further reduced

Images