Method for secondarily recycling smoke gas waste heat of continuous annealing furnace

A technology of continuous annealing furnace and flue gas waste heat, which is applied in the direction of furnace, waste heat treatment, furnace components, etc. It can solve the problems of pressure fluctuation, high control precision requirements, high investment, etc., and achieve the effect of improving water supply guarantee

Inactive Publication Date: 2011-04-13
WISDRI WUHAN WIS IND FURNACE
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Problems solved by technology

[0004] However, due to the secondary recovery and utilization of waste heat, the pressure of the "superheated water" medium is as high as 0.5-0.7Mpa, so the whole system is relatively complicated, and the control accuracy is relatively high. In addition, heat exchangers, expansion tanks and other equipment need to be produced by professional pressure vessel manufacturers. The overall system investment is high
In addition, this system is rarely used in NOF open flame heating furnace, because it is easy to cause pressure fluctuations in the NOF furnace during the adjustment process

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  • Method for secondarily recycling smoke gas waste heat of continuous annealing furnace
  • Method for secondarily recycling smoke gas waste heat of continuous annealing furnace

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Embodiment Construction

[0022] The second recycling method of the waste heat of the flue gas of the continuous annealing furnace: the low-temperature flue gas after the first recycling of the waste heat of the flue gas of the continuous annealing furnace is cooled by the heat exchanger of the second recycling system and the water-cooled roller of the annealing furnace The final cooling return water (heated to about 50°C by the annealing furnace water cooling roller) undergoes heat exchange.

[0023] The temperature of the low-temperature flue gas is 380-420°C.

[0024] Such as figure 1 As shown, the second recycling system includes a cooling return pipe 1, a water storage tank 2, a fresh water pipe 3, a solenoid valve 4, a liquid level sensor 5, a first input water pipe 6, a first check valve 7, a first A water pump 8, a first valve 9, a second water input pipe 10, a second check valve 11, a second water pump 12, a second valve 13, a heat exchanger 14, a first discharge pipe, a first discharge valve...

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Abstract

The invention relates to a method for secondarily recycling smoke gas waste heat of a continuous annealing furnace, belonging to the technical field of a band steel continuous annealing furnace, and being expansively applied to the smoke gas waste heat recovery in other fields. The method for secondarily recycling smoke gas waste heat of a continuous annealing furnace is characterized by the following step: performing heat exchange between the low temperature smoke gas generated after primarily recycling the smoke gas waste heat of the continuous annealing furnace and the cooling return waterafter the water cooling roller of the annealing furnace is cooled through a heat exchanger of a secondary recycling system, wherein the cooling return water passes through the heat exchanger for heatexchange and then is heated and sent to a cleaning section for use. The method not only saves heat energy but also saves a large quantity of cooling water in the cleaning section, and simultaneously reduces operation cost.

Description

technical field [0001] The invention relates to a method for recycling waste heat of flue gas in a continuous annealing furnace for the second time, belongs to the technical field of continuous annealing furnaces for strip steel, and can be expanded and applied to the waste heat recovery of flue gas in other fields. Background technique [0002] After the waste heat recovery through the gas / gas heat exchanger, the temperature of the flue gas from the combustion of the annealing furnace has dropped to about 400°C. Due to the low heat enthalpy, most of the current methods of dealing with this "low temperature flue gas" are to mix the flue gas with A certain proportion of cold air is discharged directly after its temperature is lowered to about 250°C, which meets the requirements of the fan. This wastes a lot of heat energy and increases the load of the exhaust fan. [0003] For radiant tube heating furnaces, there is also a method of using "superheated water" as the carrier to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00C21D1/26
CPCY02P10/25
Inventor 石祥于海陈元元郑剑辉
Owner WISDRI WUHAN WIS IND FURNACE
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