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Process for efficiently recovering afterheat generated in the process of producing sulfuric acid from pyritic

A pyrite, waste heat technology, used in preheating, chemical industry, sulfur compounds, etc.

Active Publication Date: 2012-05-30
HUNAN HENGGUANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The amount of SO3 absorbed by the secondary absorption process is about 6% of the total SO3 absorption heat. The heat released by absorbing SO3 is 0.026*106kcal / t of sulfuric acid. The acid temperature of the secondary absorption should not be too high, and it is not meaningful to recover the waste heat of the secondary absorption
Up to now, the pyrite acid production industry has not effectively recovered waste heat from absorption and transformation, and used it to produce medium-pressure superheated steam for power generation or low-pressure steam for production

Method used

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  • Process for efficiently recovering afterheat generated in the process of producing sulfuric acid from pyritic
  • Process for efficiently recovering afterheat generated in the process of producing sulfuric acid from pyritic
  • Process for efficiently recovering afterheat generated in the process of producing sulfuric acid from pyritic

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Embodiment Construction

[0147] Take the sulfuric acid production line with an annual output of 300,000 tons of Hunan Xinhengguang Technology Co., Ltd. as an example.

[0148] The production of sulfuric acid is 37.5 tons per hour. The conversion gas concentration is 8.3%, and the 3+1 process of two rotations and two suctions is adopted.

[0149] 1. The temperature of the raw material gas coming out of the fluidized fluidized furnace is 980°C, the temperature drops to 350°C through the waste heat boiler, and then enters the electric dust collector through the cyclone separator.

[0150] 2. The temperature of the electrostatic precipitator is about 320°C, and the gas volume is 74330Nm 3 / h, the heat brought by the raw material gas is about 10.68*10 6 kcal / h, the moisture content of the raw material gas is generally 6.0% (volume content), the temperature drops to 100°C after passing through the three-chamber heat storage heat exchanger, and the air temperature in front of the furnace is 280°C. Process...

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Abstract

The invention discloses process technology for comprehensively and efficiently recovering the afterheat generated in the process of producing sulfuric acid from pyritic. According to characteristics of the afterheat on different parts in the production process, different novel process technologies are applied, the recovery rate of the afterheat is improved to the maximum, a three-chamber regenerative heat exchanger is adopted to fully recover the afterheat generated by roasting raw gas, and the utilization rate of the roasting afterheat is improved; and a key process technology that low-temperature cooling water generated through spontaneous heat-insulating vacuum evaporating refrigeration in the process cools the SO2 gas to reduce the vapor content in the SO2 gas entering a drying tower is adopted to fulfill the aim of fully and efficiently recovering the afterheat in the absorption process and the conversion process. At present, the utilization rate of the afterheat recovered in theprocess of producing acid from the pyritic at home is only 43.4 percent. After the afterheat recovery technology is adopted, the afterheat utilization rate is 83.9 percent, and a way of comprehensively, fully and efficiently recovering and utilizing medium or high pressure overheat vapor generated by the afterheat in the process of producing the acid from the pyritic is opened up.

Description

technical field [0001] The invention relates to the field of sulfuric acid production from pyrite, in particular to a high-efficiency recovery and utilization process technology for waste heat in the production process. technical background [0002] The total domestic production of sulfuric acid is 50 million tons per year, of which pyrite acid production reaches 20 million tons per year. The more classic production process of using pyrite to produce acid is as follows: Flotation of pyrite raw ore to obtain sulfur concentrate with a sulfur content of about 45%, after drying, the high-temperature raw material gas generated by roasting enters the waste heat boiler to generate superheated medium-pressure steam Used for power generation or to provide low-pressure steam products after power generation; the raw material gas enters cyclone separators, electrostatic precipitators and other dust removal equipment after waste heat recovery, and the temperature drops to about 320 ° C; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/76F22B1/18F22D1/00
CPCY02P20/10Y02P20/129
Inventor 曾维兴
Owner HUNAN HENGGUANG TECH
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