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Hot gas sintering surplus heat utilization system and utilization method thereof

A waste heat and hot air technology, applied in the field of smelting and sintering, can solve the problems of hot air overflow, poor effect, high dust concentration of sintering waste gas, etc., and achieve the effect of improving strength and quality, high heat content, and saving solid fuel consumption

Inactive Publication Date: 2011-03-23
PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this application is that, firstly, the hot air used mainly comes from the blower cooler, and currently there are not a few sintering plants using draft coolers, and the waste heat waste gas is less effective for hot air sintering; It has a certain positive pressure, and the hot air in the hot air hood may overflow by using forced air induction, which will affect the effect of hot air sintering; third, the sintering waste gas contains a high dust concentration.
At present, there is no public report on hot air sintering by recovering waste heat exhaust gas and removing dust in many places

Method used

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  • Hot gas sintering surplus heat utilization system and utilization method thereof
  • Hot gas sintering surplus heat utilization system and utilization method thereof
  • Hot gas sintering surplus heat utilization system and utilization method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The present invention carries out following structural design according to the specifications of the sintering machine and the type of the annular cooler:

[0047] refer to figure 2 , the present invention installs the hot air cover 2 on the 12m sintering length behind the igniter (according to different sintering machine lengths, it is not strictly limited to 12m). When the effective sintering length of the sintering machine is 52m, the length of the igniter and the insulation section is 8m. When the temperature of the heat preservation section is between 300~600°C, install the hot air cover 2 at 12m behind the igniter. The hot air cover 2 is made up of 4 sections, and each section is 3m. The hot air cover 2 is a box structure, the middle part is connected with each other, and a hot air splitter plate 13 is installed at the bottom.

[0048] Connect the hot air duct 10 with a diameter of φ1.4m to the first section of the hot air cover. The hot air distribution plate ...

Embodiment 2

[0051] Under laboratory-scale conditions, a hot-air sintering test was carried out on vanadium-titanium magnetite concentrate using the system and method of the present invention.

[0052] In terms of weight percentage, the types and proportions of raw materials used are 51% of vanadium-titanium magnetite concentrate, 17% of imported ore, 6% of domestic fine powder, 5% of domestic medium powder, 6.5% of quicklime, 6% of limestone, and 4.8% of coke powder. %.

[0053] The hot air used is generated by a special furnace. The hot air sintering test uses a sintering cup of φ300×750mm. The particle size of the bottom layer is 10-16mm, and the thickness is 30mm. The ignition time is 2 minutes, the ignition negative pressure is 6000Pa, and the externally mixed ore is 40%, and the amount of 3-10mm and <3mm in the returned ore accounts for 1 / 3 and 2 / 3 respectively; the moisture content of the mixture is 6.8±0.1%. The sintering time is about 30min.

[0054] Compared with the experime...

Embodiment 3

[0057] The scheme 1 of this embodiment is natural induced draft, is to utilize annular cooler 6 and exhaust fan 8 to carry out natural induced draft; Scheme 2 is forced induced draft, is the high-temperature hot air that annular cooler 6 and hot screen 3 produce are drawn by induced draft fan 9. The hot air sintering carried out by forcedly introducing the hot air hood 2. According to the method of the present invention at 130m 2 The sintering machine implements hot air sintering. Matching it is 145m 2 The ring cooler is equipped with 4 exhaust fans. The hot air cover of the sintering machine is 12m long and is divided into 4 sections. During the test period, the parameters of the hot air working conditions of the two air induction schemes were tested respectively. The main parameters are shown in Table 1 below.

[0058] Table 1 The parameters of the hot air condition of the cooling waste gas of the suction ring cooler and the high temperature air of the hot screen

[0059...

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Abstract

The invention discloses a surplus utilization system of iron ore or vanadium titano ore hot gas sintering and an utilization method thereof. The invention provides two surplus heat recover devices, one device locates on an exit of a hot screen (3) of a sintering machine, another device locates on an waste gas exit of a ring cooling machine (6). The system collects high temperature air on the hot screen firstly, then collects surplus heat waste gas released by the ring cooling machine, a draught fan (9) mixes the surplus heat waste gas on two devices and transmits to a hot gas cover (2) of thesintering machine for processing hot gas sintering to the sintering material; the system can switch force induced air or natural induced air method flexible by a bypass pipe (11) and the valve (12) which is convenient to use; the surplus waste gas has high heat content and oxygen content, hot gas sintering can increase yield quality of the sintering ore and reaches aim of saving solid fuel.

Description

technical field [0001] The invention relates to the technical field of smelting and sintering, in particular to a waste heat utilization system and utilization method for hot-air sintering of iron ore or vanadium-titanium iron ore. Background technique [0002] The utilization of sintering waste heat is an important topic in the iron and steel industry. The waste heat that can be recovered and utilized in the sintering process includes: the high-temperature exhaust gas at the tail, the single-roller crushing bin, the cooling air of the hot screen and its crossbeam, and the cooling exhaust gas in the ring cooler. According to statistics, the secondary energy generated during the sintering process accounts for 12% of the total energy consumption of steel, of which 8% is sinter waste heat and 4% is sintering machine exhaust gas waste heat. For a joint enterprise with an annual output of 10 million tons of steel, the secondary heat energy that can be provided by the sintering p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D17/00
CPCY02P10/25
Inventor 何木光蒋大均谢俊勇石军林千谷吴力华
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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