Organic heat carrier waste-heat furnace and waste-heat furnace system

Abstract

The invention discloses an organic heat carrier waste-heat furnace which comprises a waste-heat furnace body and a settling chamber, wherein one side wall of the settling chamber is provided with a smoke inlet, and the other side wall of the settling chamber is connected with one side of the waste-heat furnace body through a flue; the other side wall of the waste-heat furnace body is provided with a smoke outlet, the settling chamber is internally provided with a settling chamber diaphragm-type wall pipe screen, the top of the settling chamber diaphragm-type wall pipe screen is connected with the top of the settling chamber, and the bottom of the settling chamber diaphragm-type wall pipe screen is provided with a smoke channel; the waste-heat furnace body is internally provided with a plurality of mutually parallel convection sections, each adjacent convection sections are separated by smoke folding devices, each adjacent smoke folding devices are arranged in a stagger manner, and smoke entering the adjacent convection sections turns; and the convection sections comprise a plurality of pipe screens which are mutually parallel arranged, the spacing between each adjacent pipe screens is more than 100 mm, the design can be used for ensuring the smoke entering the adjacent convection sections to turn, increasing the disturbance of the smoke, realizing the effective segregation of the smoke, reducing the smoke flow rate and reducing the abrasion of a heating surface.

Description

technical field [0001] The invention relates to a waste heat recovery device used at the tail of a smelting rotary furnace, specifically a device that uses high-temperature flue gas discharged during the production process of a smelting rotary furnace as a heating medium, and uses an organic heat carrier as a heat carrier to transport heat energy to the user. Device for thermal equipment. Background technique [0002] Waste heat is the energy that is not used in energy utilization equipment under certain economic and technical conditions, that is, redundant and waste energy. It includes seven kinds of high-temperature exhaust gas waste heat, cooling medium waste heat, waste steam and wastewater waste heat, high-temperature product and slag waste heat, chemical reaction waste heat, combustible waste gas waste liquid and waste heat, and high-pressure fluid waste pressure. The total waste heat resources of various industries account for about 17%~67% of their total fuel consum...

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Problems solved by technology

[0003] Due to the particularity of the smelting rotary furnace, the temperature of the flue gas discharged is relatively high, so most of them are equipped with steam waste heat boilers at the end of the rotary furnace to recover and utilize the heat in the flue gas, but steam waste heat boilers generally have two problems : First, the heat exchange surface of the waste heat furnace is severely worn. Because the high-temperature flue gas discharged from the smelting rotary furnace contains a large amount of dust and metal oxides, these dust and metal oxides are easy to accumulate on the heat exchange surface of the waste heat furnace, resulting in The heat transfer resistance increases, which seriously affects the waste heat recovery effect of the flue gas. At the same time, the dust flows with the flue gas. When the heat exchange surface is washed, it is easy to wear the heat exchange surface, reduce the life of the heat exchange device, and also cause the work of the entire waste heat furnace. The efficiency is reduced; the second is the problem of low-temperature corrosion of waste heat boiler equipment. Low-temperature corrosion refers to the sulfuric anhydride in the flue gas when the metal wall temperature of the heat-receiving surface (economizer, air preheater, etc.) Corrosion caused by condensation of water vapor on the pipe wall

This metallurgical industrial kiln dust-containing flue gas waste heat utilization device is to enter the dust-containing flue gas discharged from the industrial kiln through the inlet flue of the cyclone separation heat exchanger and enter the cylinder of the cyclone separation heat exchanger along the tangential direction of the cylinder. Part of the dust is separated from the flue gas under the action of the flue gas. The dust falls into the vertical pipe of the cyclone separation heat exchanger and is discharged regularly through the air-lock ash discharge valve. The next heat exchange with the preheater, such a structural design not only increases the equipment in the waste heat furnace, complicates the structure of the waste heat furnace, but also increases the manufacturing cost and maintenance cost of the equipment, and it cannot completely solve the problem. Dust and wear problems in heat exchange area of ​​waste heat furnace

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