Argon Oxygen Decarburization Converter Flue Gas Waste Heat Thermal Electric Cooling Triple Generation and Dust Removal System

Abstract

The invention relates to a heat-electricity-cold trigeneration and dust removal system for flue gas waste heat of an argon-oxygen-decarburizing converter. Secondary flue gas of the argon-oxygen-decarburizing converter sequentially enters a roof hood and a spark trapping low-pressure pulsed jet cloth filter, and then is discharged from an exhaust funnel; and primary flue gas enters a sedimentation chamber, and then enters a finned waste heat boiler through a heat-preserving flue so as to form saturated steam, and after the primary flue gas is cooled, smoke dust enters the spark trapping low-pressure pulsed jet cloth filter and then is discharged from the exhaust funnel. The saturated steam produced by the boiler is conveyed to a heat accumulator, then the steam in the heat accumulator drives a turbine, and the turbine drives a power generator to generate power. After the saturated steam enters the turbine and acts completely, the saturated steam enters a condenser to form condensed water, then the condensed water is pumped in a snakelike heat exchanger to heat through a condensed water pump, and the heated water enters a lithium bromide refrigerator to refrigerate. Hot smoke dust controls the temperature of flue gas at about 100 DEG C through the finned waste heat boiler and the snakelike heat exchanger, and then water is heated through the snakelike heat exchanger so as to realize heating of office buildings. According to the invention, heat electricity and cold are converted through waste heat, and then environmental protection requirements are satisfied.

Description

technical field [0001] The invention relates to an argon-oxygen decarburization converter flue gas waste heat heat-electricity-cooling tri-generation and dust removal system, which belongs to the technical field of environmental protection equipment and resource recovery. Background technique [0002] At present, the utilization ratio of waste heat resources in my country is low. According to statistics, the total amount of waste heat produced by large and medium-sized enterprises in my country is 8.44GJ per ton of steel, accounting for about 37% of the energy consumption per ton of steel, of which the sensible heat carried by final products or intermediate products accounts for about 39% of the total waste heat. Sensible heat of slag accounts for about 9%, various waste (smoke) gases account for 37%, physical heat carried by cooling water accounts for about 15%, and waste heat resources are abundant. The waste heat utilization rate of large iron and steel enterprises in my ...

AI Technical Summary

Problems solved by technology

There are more than 400 80-200 ton converters, and the market for argon-oxygen decarburization converters is larger. The utilization rate of waste heat recovery is less than 20%, and the application ratio is low.

At present, domestic converter waste heat adopts "vaporization flue + bag filter" and "heat pipe boiler + bag filter", etc., which have many defects, mainly including less saturated steam and serious waste of heat energy.

[0005] The existing products mainly have the following disadvantages: (1) The recycling rate of the waste heat of the medium and low temperature exhaust gas is low, and the energy waste is serious

(2) The service life of the vaporization flue is short

(3) In the traditional process of the converter, the vaporization flue is arranged in an "inclined upward" manner. Generally, the length of the vaporization flue is between 50 and 60 meters. The installation and maintenance of the vaporization flue are more troublesome. The cost is high; the waste heat utilization efficiency is not high, the steam production is small and unstable; the vaporization flue can only use hot smoke above 700 °C, and cooling measures are adopted later, the system investment is large, and the process is very inflexible

(4) The investment of heat tube boilers is relatively high, and heat tube boilers are more serious for collecting viscous dust generated by converter smelting (the same problem as waste heat boilers)

(5) The full wet method (unburned method) is also called the double venturi tube purification and dust removal system. In the whole purification system, water spraying is used to achieve the purpose of cooling and purifying the flue gas. The water consumption is large and the system materials are easy to use. Corrosion, also need to deal with a large amount of sewage and mud equipment, the investment cost is quite high, the system resistance is large, the recovery rate of dust and gas is low, and the emission of carbon dioxide is large. And replacement is a common problem of wet dust removal, many steel mills are actively improving, some manufacturers changed to semi-dry method, the effect is not good

Now it is a big trend to change from wet method to dry method, but no reasonable solution has been found

(6) The existing dry electrostatic precipitator equipment has high investment, high energy consumption and high maintenance costs

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