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Cement self-desulfurization device and method

A self-desulfurization and cement technology, which is applied in the field of cement manufacturing, can solve problems such as difficult operation, low desulfurization efficiency, and high equipment investment, and achieve the effects of improving sulfur fixation efficiency, reducing investment costs, and improving desulfurization efficiency

Active Publication Date: 2021-09-28
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurization technology requires high equipment investment, difficult operation, and low desulfurization efficiency due to the need for material extraction, separation, cooling and other processes in the production process

Method used

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  • Cement self-desulfurization device and method
  • Cement self-desulfurization device and method
  • Cement self-desulfurization device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] 5000T / D cement production line, preheater export SO 2 Emission concentration is 400mg / nm 3 (2. Rehabilitate the concentration of 10% oxygen, the same as the same); after the raw material grinding sulfur, the chimney exit O 2 10% concentration, SO 2 Emission concentration is 200mg / nm 3 . In order to put SO 2 Control at 100 mg / nm 3 Within, the technical solution described in this patent is used to modify the system. Increasing the thermoforgia extracting pipe leading from the export of a separate furnace, that is, the flue gas extraction pipe and the flue gas valve, the diameter of the flue gas extraction pipe is φ600mm, the extracted hot flue gas is directly connected to the top premium preheater Export pipeline; the internal wall of the export pipe of the most superior preheater is incorporated into V. 2 O 5 The mass fraction is 0.5%; the water sprinkle is added to the thermos of the flue gas extraction pipe, allowing the flue gas moisture volume fraction to 8%; adj...

Embodiment 2

[0076] 2500T / d cement production line, preheater export SO 2 Emission concentration is 600mg / nm 3 (2. Rehabilitate the concentration of 10% oxygen, the same as the same); after the raw material grinding sulfur, the chimney exit O 2 10% concentration, SO 2 Emission concentration is 350mg / nm 3 . In order to reduce SO 2 The emission level is modified using the technical solution described in this patent. Increasing the flue gas extraction pipe and flue gas valve from the outlet of the split furnace, the diameter of the flue gas extraction pipe is φ500mm, the extracted thermal pan gas directly accesses the most superior preheater export pipe; the superior preheating Inner wall of the export pipe is incorporated into V 2 O 5 The mass fraction is 0.5%; the water sprinkle is added to the flue gas extraction official road, so that the flue gas moisture volume fraction is controlled at 8%; the kiln gray collected by the remaining hot boiler is partially sent into the decomposition fu...

Embodiment 3

[0084] In the same embodiment, the inner wall of the exit pipe of its most superior preheater is not coated into V. 2 O 5 Pouring tab. At this time, the cement production self-desulfurization process and the actual effect of the device are shown in Table 3 at the time of different valve opening.

[0085] Table 3 Cement production self-desulfurization process and actual effect of the device

[0086]

[0087] As can be seen from Table 3, when the least coated V in the outer pretty preheater outlet pipe 2 O 5 Time, more than the first embodiment, the desulfurization efficiency is significantly reduced. When the valve opening degree is 20%, its desulfurization efficiency is only 81% of Example 1 under the same conditions; when the valve opening degree is 60%, the desulfurization efficiency is only 83% of Example 1 under Example 1 under the same conditions. From this, it can be seen that the outer wall coating of the first-level preheater outlet conduit in the patent of the present i...

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Abstract

The invention provides a cement self-desulfurization device and method. The device includes a decomposition furnace, a waste heat boiler, several preheaters and the outlet pipe of the uppermost preheater; the two ends of the outlet pipe of the uppermost preheater are respectively connected to the uppermost preheater and the waste heat boiler, and it also includes: The hot flue gas extraction pipe, one end of which is connected to the decomposition furnace; the outlet pipe of the uppermost preheater is provided with an interface near the position of the uppermost preheater; the hot flue gas extraction pipe is connected to the uppermost The outlet pipe connection of the upper preheater is used to transport the flue gas containing hot raw meal extracted from the calciner by the hot flue gas extraction pipe to the waste heat boiler through the outlet pipe of the uppermost preheater. Through the method and device, the hot raw material produced in the cement production process is used for dry flue gas desulfurization, which significantly improves the efficiency of the existing cement flue gas dry desulfurization, and at the same time reduces equipment investment and operating costs, making it more suitable for practical use. .

Description

Technical field [0001] The present invention belongs to the field of cement manufacturing, and in particular, it relates to a cement self-desulfurization apparatus and method for reducing contaminant discharge. Background technique [0002] Sulfur dioxide (SO 2 ) One of the common atmospheric pollutants, in addition to forming acid rain, destroying the ecological environment, forming PM2.5, induces the ash, affecting human health. In the cement calcination process, a large number of SO will produce 2 . According to statistics, my country SO 2 The annual emissions are more than 20 million tons, including 3 to 4% of the cement industry. [0003] In December 2013, the Ministry of Environmental Protection and the State Administration of Quality Supervision released the standard GB4915-2013 of cement industrial atmospheric pollutant emission standards for the original standard GB4915-2004, which provides for the existing cement plant SO 2 Emission concentration does not exceed 200 mg ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/38C04B7/43
CPCC04B7/38C04B7/43
Inventor 王俊杰房晶瑞汪澜
Owner CHINA BUILDING MATERIALS ACAD
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