Hydrochloric acid regenerated flue gas emission system and emission method

A technology for regenerating flue gas and exhaust system, which is applied in the field of hydrochloric acid regeneration flue gas exhaust system, which can solve the problems of hydrogen chloride and dust treatment not up to standard, and achieve the effect of ensuring long-term reliable operation, good corrosion resistance, and small pressure loss

Pending Publication Date: 2019-05-07
NEW METALLURGY HI TECH GRP
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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a hydrochloric acid regeneration flue gas emission system and emission method to solve the technical problem of substandard hydrogen chloride and dust treatment in the existing flue gas absorption and purification treatment process

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  • Hydrochloric acid regenerated flue gas emission system and emission method

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Embodiment 1

[0054] Utilize the hydrochloric acid regeneration flue gas ultra-low discharge system provided by the present invention to be 3.5m 3 / h hydrochloric acid regeneration unit for processing, among which, the device parameters involved in the hydrochloric acid regeneration flue gas ultra-low emission system are as follows:

[0055] The inlet temperature of the primary absorption tower 1 is 88-96°C, and the flue gas intake volume of the primary absorption tower 1 is 8700-9500Nm 3 / h, the instant spray volume is 3.5m 3 / h of absorbed water; the area of ​​flue gas cooler 3 is 350m 2 , the cooling capacity is 1300000Kcal / h; the gas-liquid cyclone separator 4 is equipped with 30 pieces with a rated flow rate of 300m 3 / h ceramic cyclone; the flue gas temperature at the outlet of the flue gas cooler 3 is 55-60°C, the outlet gas temperature of the chimney 7 is 60°C, and the hydrogen chloride content is 13.8mg / m 3 , the concentration of dust particles is 9.5mg / m 3 , to achieve ultra-l...

Embodiment 2

[0058] The hydrochloric acid regeneration flue gas ultra-low emission system provided by the present invention is used to treat the hydrochloric acid regeneration unit with a processing capacity of 6.0m3 / h, wherein the device parameters involved in the hydrochloric acid regeneration flue gas ultra-low emission system are as follows:

[0059] The inlet temperature of the primary absorption tower 1 is 88-96°C. The flue gas intake volume of the primary absorption tower 1 is 14000-16000Nm 3 / h, the instant spray volume is 6.0m 3 / h of absorbed water. The area of ​​flue gas cooler 3 is 600m 2 , the cooling capacity is 2300000Kcal / h. The gas-liquid cyclone separator 4 is assembled by 32 with a rated flow rate of 500m 3 / h ceramic cyclone sub. The outlet gas temperature of flue gas cooler 3 is 55-60°C, the outlet flue gas temperature of chimney 7 is 60°C, and the hydrogen chloride content is 15.4mg / m 3 , the concentration of dust particles is 8.9mg / m 3 , to achieve ultra-low s...

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Abstract

The invention relates to a hydrochloric acid regenerated flue gas emission system and an emission method and belongs to the technical field of regeneration of waste hydrochloric acid. The system and the method are used for solving the problem that the existing hydrochloric acid regeneration device is behindhand in process and cannot guarantee that the content of hydrogen chloride discharged in atmosphere is lower than 20mg / m<3> and the concentration of dust particulate matters is lower than 10mg / m<3>. The system comprises an absorption unit, a cooling unit, a separating unit, an air exhaust unit and a washing unit sequentially along a flue gas flow direction, wherein a monitoring device is arranged on the washing unit and is used for monitoring the content of pollutants in discharged fluegas; the absorption unit is used for absorbing hydrogen chloride from the flue gas to form regenerated hydrochloric acid; and the separating unit is used for separating dust particles with the particle size of 1 micron or more and liquid beads from the flue gas. According to the system, not only is the condition that the content of hydrogen chloride discharged in atmosphere from an iron-and-steelcold-rolling hydrochloric acid regeneration unit is lower than 20mg / m<3> and the concentration of dust particulate matters is lower than 10mg / m<3> achieved, but also the content of water vapor in theflue gas is greatly lowered; and the temperature of discharged flue gas is not above 60 DEG C.

Description

technical field [0001] The invention relates to the technical field of waste hydrochloric acid regeneration, in particular to a hydrochloric acid regeneration flue gas discharge system and discharge method. Background technique [0002] In the field of waste hydrochloric acid treatment, the iron and steel industry generally adopts the spray roasting method to recover and regenerate waste hydrochloric acid. The method is to spray concentrated waste hydrochloric acid liquid into the high-definition area of ​​the roasting furnace reactor. After chemical heat treatment, the high-temperature flue gas is dedusted and cooled by a Venturi pre-concentrator. After cooling, the flue gas is absorbed and purified and then discharged into the atmosphere through a chimney. The general flue gas absorption and purification process is as follows: firstly cool the flue gas, then introduce the flue gas into the primary absorption tower and / or the secondary absorption tower, after absorbing the ...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/14B01D53/00B01D50/00B01D47/06F27D17/00
CPCY02P10/25
Inventor 邱光习杨绿郭振英张振林苏泽
Owner NEW METALLURGY HI TECH GRP
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