Anti-corrosion self-compensation low-temperature heat exchanger system for biomass circulating fluidized bed boiler

Abstract

The invention discloses an anti-corrosion self-compensation low-temperature heat exchanger system for a biomass circulating fluidized bed boiler. The anti-corrosion self-compensation low-temperature heat exchanger system comprises a low-temperature heat exchanger of a coiled pipe structure, a low-temperature steam drum and a channel type air preheater, wherein the low-temperature heat exchanger isconnected with the low-temperature steam drum; the low-temperature steam drum is connected with the air preheater through a saturated steam outlet pipe; the air preheater is connected with the low-temperature heat exchanger through a connecting pipe to form a water circulation loop. The system is provided with the low-temperature steam drum, a natural water circulation way is adopted, working substances flows through a pressure head generated by a steam-water liquid level difference, a circulating water pump does not need to be arranged, and therefore, the anti-corrosion self-compensation low-temperature heat exchanger system has good boiler load change adaptability. A heat adsorption amount is subjected to self-compensation regulation according to the temperature of smoke which enters the low-temperature heat exchanger, and the temperature of outlet smoke is regulated. According to the system, factory power utilization can be lowered, the thermal efficiency of a whole factory is improved, and economical efficiency is improved.

Description

technical field [0001] The invention relates to the field of circulating fluidized bed boilers, in particular to an anti-corrosion self-compensating low-temperature heat exchanger system for biomass circulating fluidized bed boilers, which is applied to biomass power generation equipment. Background technique [0002] With the continuous and rapid development of society, the world's demand for energy continues to increase, and fossil fuels can no longer meet the growing energy demand. Therefore, the development of renewable energy has become the focus of attention all over the world. Among them, biomass fuel power generation technology has been applied on a large scale. Currently available biomass fuels mainly include: forestry waste (such as: bark, branches, etc.), agricultural waste (such as: rice husk, straw, etc.) and other waste (such as: garbage, sludge, etc.) kind. The common characteristics of these biomass fuels are: the volatile content of the combustible base...

AI Technical Summary

Problems solved by technology

This method can reduce the impact of corrosion on the heating surface to a certain extent when the sulfuric acid vapor condenses, but due to the characteristics of the combustion products of biomass fuels that are easy to accumulate ash, it will still cause ash accumulation in the air preheater, and even ash clogging in severe cases, reducing the efficiency of the boiler

[0007] Fourth, the flue gas cooler system is used. This method can effectively prevent corrosion of the low-temperature heating surface. However, the system is a forced circulation system with a circulating water pump, which will increase the power consumption of the plant and reduce the thermal efficiency of the plant.

Images