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Desulphurization method for petroleum coke fuel for dry process rotary cement kiln

A dry process cement and petroleum coke technology, applied in the field of cement production, can solve the problems of slow burning speed, high ignition temperature and ember temperature of petroleum coke, pollution, etc., and achieve the effect of reducing potential safety hazards and reducing the concentration of sulfur dioxide.

Active Publication Date: 2017-08-04
NANCHANG GANHENGXING TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can eliminate the sulfur in the flue gas of petroleum coke combustion, due to the high ignition temperature and embers temperature of petroleum coke and the slow combustion speed, it is difficult to use petroleum coke as the calcination requirement of dry-process cement rotary kiln only by this method
[0005] Therefore, there is an urgent need to research and develop a method that can use petroleum coke in dry-process cement rotary kilns, which can not only solve the problem of high ignition temperature and burnout temperature of petroleum coke, slow combustion speed, but also solve the problem of SO caused by petroleum coke combustion. 2 pollution problem

Method used

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  • Desulphurization method for petroleum coke fuel for dry process rotary cement kiln
  • Desulphurization method for petroleum coke fuel for dry process rotary cement kiln

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Embodiment 1

[0035] The present invention provides a petroleum coke fuel desulfurization method for dry-process cement rotary kiln. Petroleum coke is measured by an electronic tape scale and then fed into a petroleum coke mill until the sieve residue of 0.08mm square hole is less than 1%. After being measured by the electronic tape scale, it is fed into the rice husk grinder and crushed to rice husk powder with a particle size of less than 0.8mm. The weight percentage of petroleum coke and rice husk powder is 90%: 10%. The rice husk powder is produced by the petroleum coke grinding system. The exhaust fan is sucked into the bag filter and mixed with the petroleum coke powder that enters the bag filter at the same time, and then sent to the mixed fuel bin by the screw conveyor. The mixed fuel is measured by two rotor weighing scales and then sent by two screw pumps The mixed fuel is sent to the calciner and the rotary kiln head burner for combustion respectively. At the same time, lithium s...

Embodiment 2

[0038] The weight percentage of petroleum coke and rice husk powder in Example 1 was changed to 80%: 20%, and lithium slag was added according to 5% of the total mass of cement raw meal, and other processes were the same as in Example 1.

[0039] The mixed fuel and cement raw meal prepared by this embodiment, after the calcination process, the content of sulfur trioxide in the cement clinker is 1.4%; the concentration of sulfur dioxide in the exhaust gas discharged from the rotary kiln into the air is 7.5mg / m 3 .

Embodiment 3

[0041] In Example 1, the weight percentage of petroleum coke and rice husk powder was changed to 70%:30%, and lithium slag was added according to 3% of the total mass of cement raw meal, and other processes were the same as in Example 1.

[0042] The mixed fuel and cement raw meal prepared by this embodiment, after the calcination process, the content of sulfur trioxide in the cement clinker is 1.5%; the concentration of sulfur dioxide in the exhaust gas discharged from the rotary kiln into the air is 3.9mg / m 3 .

[0043] The concentration of sulfur dioxide in the flue gas emitted by conventional cement plants using petroleum coke as fuel is relatively high, usually higher than 100mg / m 3 , for some newly-built cement plants, due to better environmental protection measures, the concentration of sulfur dioxide will be lower than 100mg / m 3 , but usually higher than 50mg / m 3 , as environmental protection requirements are getting higher and higher, a large number of new cement ...

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Abstract

The invention provides a desulphurization method for a petroleum coke fuel for a dry process rotary cement kiln. The method comprises the following steps: adding rice hull powder into petroleum coke to be uniformly mixed to form a mixed fuel; and meanwhile, adding lithium slag into cement raw meal. According to the desulphurization method, on one hand, an alkali metal oxide with very high chemical activity in the rice hull powder can chemically react with sulfur in the petroleum coke in a combustion process to generate sulfate to be deposited in cement clinker, and on the other hand, the alkali metal oxide in the lithium slag can absorb sulfur oxide volatilized in gas in suspended preheating and decomposing processes of the cement raw meal to generate sulfate to be deposited in the cement clinker, so that the discharge of sulfur dioxide in tail kiln flue gas is reduced. According to the desulphurization method provided by the invention, the discharge of sulfur dioxide in the tail kiln flue gas can be reduced to 20.0mg / m<3> below.

Description

technical field [0001] The invention relates to the field of cement production, in particular to a petroleum coke fuel desulfurization method used in a dry-process cement rotary kiln. Background technique [0002] At present, the crude oil processing capacity of my country's oil refining industry has reached 600 million t / a, and the production capacity of coking units is more than 100 million t / a, and will continue to grow for a considerable period of time in the future. Petroleum coke is the product of the coking process, and the yield is close to 5% of the crude oil processing volume. The huge processing capacity has made my country's petroleum coke market increasingly saturated, and as the world's largest petroleum coke producer, the United States has a steady stream of petroleum coke due to its low price Entering the Chinese market has increased the surplus of my country's petroleum coke market, and the price of petroleum coke is also far lower than that of bituminous coa...

Claims

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Application Information

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IPC IPC(8): C04B7/42C04B7/44
CPCC04B7/421C04B7/4423
Inventor 黄少文吴飞龙
Owner NANCHANG GANHENGXING TECH DEV CO LTD
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