Supercritical water gasification and recycling method and apparatus for steel mill high-oil-content iron-containing sludge
A technology of supercritical water gasification and treatment method, applied in water/sludge/sewage treatment, sludge treatment, dehydration/drying/concentrated sludge treatment, etc. Problems such as large water volume, to achieve the effect of simple process, strong operability and high calorific value
Inactive Publication Date: 2017-01-11
CHONGQING CISDI THERMAL & ENVIRONMENTAL ENG CO LTD
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Problems solved by technology
However, as a new sludge treatment technology, supercritical water gasification technology is rarely used in steel mill sludge treatment, and previous studies have found that in order to achieve a good sludge treatment effect, the system temperature must be increased, which is undoubtedly increased energy consumption
Blast furnace gas, a by-product energy produced in the steelmaking production of iron and steel enterprises, is difficult to meet the production needs of iron and steel enterprises due to factors such as low calorific value, high dust and water content, and large pressure fluctuations. Most iron and steel plants produce blast furnace hot blast stoves, coke Coke oven gas is mixed with coke oven gas, and the remaining gas is released in vain, resulting in a waste of resources
Method used
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Embodiment 1
[0031] High oil and iron-containing sludge from a steel mill was collected from a cold rolling sludge pool of a steel mill. The sludge is black, has a lubricating oil smell, and has a high oil content. The industrial analysis and elemental analysis of the sludge are shown in Table 1, the inorganic element composition of the sludge is shown in Table 2, and the XRD crystal phase analysis of the sludge is shown in Table 1. figure 2 Shown:
[0032] Table 1 Sludge industrial analysis and elemental analysis
[0033]
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The invention relates to a supercritical water gasification and recycling method and apparatus for steel mill high-oil-content iron-containing sludge; steel mill high-oil-content iron-containing sludge is conditioned and then fed to and preheated in a heater using low-caloric blast furnace gas as a fuel, the preheated sludge is fed to a supercritical water gasification reactor and is subjected to supercritical water gasification before entering a gas-liquid separator, and separated mixed gas is separated to obtain high-caloric methane and hydrogen mixed gas; high-caloric fuel gas is produced by using low-caloric blast furnace gas and supercritical water gasification technique; after the iron-containing sludge is subjected to supercritical water gasification, iron matters therein are fully converted into ferriferous oxide; therefore, water-slag mixture separated from the gas-liquid separator can be simply dried and magnetically separated and then returned to a steel furnace as steelmaking material. The making method has high processing efficiency and short processing time, sludge and blast furnace gas are recycled, no secondary pollution is caused, and the method and apparatus are widely applicable to the recycling of steel mill sludge.
Description
technical field [0001] The invention belongs to the technical field of chemical industry and iron and steel metallurgy, in particular to the field of resource utilization of steel mill sludge and low calorific value blast furnace gas, and relates to a supercritical water gasification resource treatment method and device for highly oily and iron-containing sludge in steel mills. Background technique [0002] In the steel rolling production process, a large amount of direct cooling water is required to wash the steel and equipment, and a large amount of waste water will be generated. The waste water mainly contains iron oxide produced on the surface of the roll table of the spray cooling mill and the rolled steel, and oil on the mechanical equipment. Substances, solid impurities and other wastes and sludge, etc., the main pollutants are a large number of iron oxides, lubricating oils and emulsions with different particle sizes. Among them, the emulsion in cold rolling wastewate...
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IPC IPC(8): C02F11/00C02F11/10C02F11/12C22B1/00C02F101/20C02F101/30C02F103/16
CPCC02F11/00C02F11/10C02F11/12C02F2101/203C02F2101/30C02F2103/16C02F2209/02C02F2209/03C02F2209/44C22B1/005
Inventor 徐志鹏郭灵巧郎明松
Owner CHONGQING CISDI THERMAL & ENVIRONMENTAL ENG CO LTD