On-line intelligent diagnosis and bypass protection device and control method of waste heat boiler heat pipe heat exchanger

Abstract

The invention relates to an online intelligent diagnosis and bypass protection device for a heat pipe heat exchanger of a waste heat boiler. The device includes a waste heat boiler, a flue gas pipeline, a blower, an electric control valve, a lifting device, a cylinder propulsion mechanism, a rocker arm, and a push block. Heavy hammer piston, purge gas storage tank, water inlet regulating valve, heat pipe heat exchanger, the heat pipe heat exchanger in the production intermediate link of the waste heat boiler, the front and rear inlet and outlet flue gas pipes are equipped with pressure measuring points, temperature measuring points Install temperature measuring points, intelligent diagnostic dust removal and self-cleaning device by adding a purge gas storage tank, introducing high-temperature flue gas through the blower into the gas storage tank through the electric control valve, and introducing compressed air into the gas storage tank through the total air source electric control valve. Purging under pressure, the purge gas storage tank and the heat pipe heat exchanger are connected through three sets of electronically controlled valves, and a heavy hammer piston device is installed inside the purge gas storage tank. This technical solution can judge the blockage of the heat pipe heat exchanger online With low heat exchange efficiency, it has an intelligent diagnostic heat pipe automatic dust removal and self-cleaning device. At the same time, for the failure of the heat pipe heat exchanger, it can prevent dry burning and heat pipe explosion. This solution can automatically detect and judge the flue gas bypass device to ensure that Heat pipe and boiler production safety.

Description

technical field [0001] The invention relates to a protection device, in particular to an online intelligent diagnosis and bypass protection device for a waste heat boiler heat pipe heat exchanger, belonging to the technical field of waste heat boiler heat pipe heat exchanger devices. Background technique [0002] The heat pipe heat exchanger is a relatively important device for waste heat utilization and conversion in the production process of the CDQ waste heat boiler. The high temperature flue gas (1000°C) discharged from the CDQ furnace uses nitrogen to replace the heat of red coke and enters the waste heat after about one dust removal. Boilers exchange heat with steam and water to produce steam to drive turbogenerators to generate electricity. The flue gas after heat exchange in the waste heat boiler is subjected to secondary dust removal, and then the flue gas at about 170°C is sent to the heat pipe heat exchanger through the fan for secondary heat exchange, and the tem...

AI Technical Summary

Problems solved by technology

[0003] At present, the pressure and temperature before and after the flue gas in and out of the heat pipe heat exchanger, and the temperature and pressure before and after the deaeration feed water are determined according to the boiler flue gas load and the pressure of the deaeration feed water pump. The operating parameters are relatively fixed. Once one of the variables changes greatly, it will affect the changes of other unit parameters, which is not conducive to the effective operation and efficiency improvement of the heat pipe heat exchange device and the entire boiler production

Secondly, the working condition of the heat pipe working medium inside the heat pipe heat exchanger cannot be directly judged, and the heat transfer effect is low. I don’t know what caused it, especially the ash blockage of the heat-receiving area of ​​the heat pipe bundle, which affects the flow of flue gas and reduces the heat transfer effect. , it is impossible to predict the clogging situation online in advance or to improve the heat transfer effect by online purging

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