Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof

A low-temperature waste heat and waste gas technology, which is applied in waste heat treatment, lighting and heating equipment, furnaces, etc., can solve the problems that waste heat utilization of waste gas is not involved, and the waste heat utilization rate of sintering process is less than 30%, which is beneficial to environmental protection and reduces solid waste. Effects of fuel consumption, load reduction and temperature

Inactive Publication Date: 2010-11-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to statistics, the utilization rate of waste heat in sintering process in my country is less than 30%.
The purpose of this patent is to make the SO in the flue gas 2 Enrichment is achieved to

Method used

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  • Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof
  • Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof
  • Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1:

[0038] Such as figure 1 As shown, an area of ​​132m 2 On the sintering machine, (the sintering machine is equipped with a main exhaust fan, the main exhaust gas volume is 469390Nm 3 / h), the higher temperature flue gas (100~450℃, 100000Nm) in the wind box 109 at the tail of the sintering machine 3 / h) Extracted from the high-temperature flue 4, returned through the dust collector 5 and the flue gas fan 6, and extracted by the exhaust fan 7 from the ring cooler hot exhaust gas (300000Nm 3 / h, above 150°C) enter the mixer 8 for mixing, enter the sintering machine air hood 105 of the sintering machine, and send it to the surface of the sintering machine material layer to realize the exhaust gas circulating sintering.

[0039] The flue gas volume of the sintering machine wind box at the tail of the sintering machine is all flue gas whose flue gas temperature exceeds 100℃ in the tail wind box, that is, all the exhaust gas whose flue gas temperature is greater than 100℃...

Example Embodiment

[0042] Example 2:

[0043] Such as figure 2 As shown, an area of ​​450m 2 On the sintering machine, (the sintering machine is equipped with 2 main exhaust fans, and the flue gas volume of each fan is 21000m 3 / min), the higher-temperature flue gas in the tail wind box 109 of the sintering machine is concentrated into a large flue, that is, extracted from the high-temperature flue 4, and drawn back through the electrostatic precipitator 106 and the main exhaust fan 108 of the sintering machine. After the valve 110 is opened, it passes through the return pipeline 111 to enter the mixer 8 together with the three gases extracted by the oxygen supplementary fan 9 and the hot exhaust gas from the ring cooler through the exhaust fan 7 to enter the sintering machine. The air hood 105 of the sintering machine is sent to the surface of the material layer of the sintering machine to realize the circulating sintering of exhaust gas. The three-way valve 110 can be used to directly discharge ...

Example Embodiment

[0046] Example 3:

[0047] Such as image 3 As shown, an area of ​​132m 2 On the sintering machine (the system is equipped with a main exhaust fan), a part of the flue gas is extracted from the exhaust flue 107 connected to the chimney 3 through the auxiliary circulation fan 10, and enters the sintering machine hood 105 of the sintering machine, and is sent to the sintering machine The surface of the machine material layer forms an auxiliary circulation pipeline.

[0048] The higher-temperature flue gas at the tail of the sintering machine wind box 109 is extracted from the high-temperature flue 4, and returned through the dust collector 5 and the flue gas fan 6, and the oxygen is extracted through the oxygen fan 9 and the exhaust gas is extracted from the ring type The three hot exhaust gases from the cooler enter the mixer 8 together for mixing, and then enter the sintering machine air hood 105 of the sintering machine, and are sent to the surface of the sintering machine materia...

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Abstract

The invention discloses a method of sintering low temperature waste heat circulation and discharged waste gas reduction and a device thereof. The method comprises the following steps: drawing out flue gas having a high temperature in an air bellow on the rear part of the main-flue of a sintering machine; dedusting; mixing the flue gas with hot waste gas extracted from a sintering cool machine into a mixer to form the mixed hot waste gas; and transmitting the mixed hot waste gas on the surface of the material layer of the sintering machine for circular sintering. The device comprises a high temperature flue gas circulation pipeline of the sintering machine connected with a high temperature flue of the sintering machine, a hot waste gas circulation pipeline of a sintering cool machine connected with the sintering cool machine and a total circulation pipeline connected with a sintering machine fan cover. By using the invention, the waste gas discharging total amount and the pollutants discharging amount produced in a sintering process can be greatly reduced, the low temperature waste heat in the flue gas can be recycled and energy consumption of the sintering process can be saved, thus, the method of the invention has significant energy saving and emission reduction value.

Description

technical field [0001] The invention relates to a method and a device for sintering low-temperature waste heat circulation and exhaust gas reduction. Background technique [0002] A large amount of waste gas will be generated during the iron ore sintering production process, such as a 495m 2 When the sintering machine is in normal production, the amount of exhaust gas emitted is as high as 1.2 million standard cubic meters (Nm 3 / h) above. In addition, sintering waste gas contains a variety of complex environmental pollutants, such as dust, SO 2 , NO X , heavy metals (such as Cd, Hg, As, Pb, etc.), HCl, HF, volatile organic pollutants (VOC), polycyclic aromatic hydrocarbons (PAHs), dioxin-like persistent organic pollutants (POPs), etc. In addition to improving dust emission control standards, the new "Iron and Steel Industry Air Pollutant Emission Standards" have clearly increased SO in sintering flue gas 2 , NO X and emission control standards for pollutants such as d...

Claims

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Application Information

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IPC IPC(8): F27D17/00
Inventor 李咸伟石洪志俞勇梅何晓蕾
Owner BAOSHAN IRON & STEEL CO LTD
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