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Air-coal graded low-nitrogen combustion equipment and technology and cement clinker firing system

A low-nitrogen combustion and air-coal technology, applied in combustion equipment, lighting and heating equipment, indirect carbon dioxide emission reduction, etc., can solve the problems of increased safety management costs, low reduction efficiency, sticky materials, etc., and achieve improved reduction efficiency and improved Good reduction efficiency and dispersion effect

Active Publication Date: 2017-09-15
TIANJIN DECHENG ZHICHENG CEMENT BUILDING MATERIALTECH CONSULTATION SERVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the SNCR method is that it significantly increases the operating cost of the enterprise (about 5 yuan / ton of clinker), and there are inevitably ammonia escape and ammonia volatilization problems, and ammonia volatilization will produce flammable, explosive and toxic gas, the corresponding safety management costs will also increase. In addition, the energy consumption and pollution emissions in the ammonia water manufacturing process are also transferred to the cement production process.
Air staged combustion technology NO x The reduction efficiency is only 15-25%, which is greatly affected by the operation control
Fuel Staged Combustion Technology NO x The reduction efficiency is only 15-30%, and there is also the problem of sticky materials on the calciner cone and the side wall of the smoke chamber, which leads to the failure of continuous normal production
NO of air staged combustion technology and fuel staged combustion technology x The reduction efficiency is low, and it is necessary to combine SNCR technology to improve NO x Reduction efficiency, therefore, cannot significantly reduce the amount of ammonia used in SNCR technology

Method used

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  • Air-coal graded low-nitrogen combustion equipment and technology and cement clinker firing system
  • Air-coal graded low-nitrogen combustion equipment and technology and cement clinker firing system
  • Air-coal graded low-nitrogen combustion equipment and technology and cement clinker firing system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The air-coal graded low-nitrogen combustion equipment in this embodiment includes a decomposition furnace 5, a tertiary air valve 14, a cyclone C4-C5, a rotary kiln 1, a flap valve 9, a high-temperature-resistant air-locking screw conveyor 12, a Roots blower 13, Add a tertiary air valve 15 and a material distribution valve 16, the calciner 5 is provided with a tertiary air inlet and a new tertiary air inlet that is separated, and the tertiary air main pipeline passes through the tertiary air valve 14 and the tertiary air on the calciner 5. Inlet connection; on the tertiary air main pipeline after the tertiary air valve 14, a tertiary air branch pipeline is established, and a newly added tertiary air valve 15 is set on the tertiary air branch pipeline, and the tertiary air branch pipeline is newly added through the tertiary air valve 15 It is connected with the new inlet of the tertiary air that is separated; the calciner 5 is divided into the reduction and decomposition ...

Embodiment 2

[0071] The connection relationship and process steps of the air-coal material graded low-nitrogen combustion equipment in this embodiment are the same as in Embodiment 1, except that the distance between the lateral position of the spray pipe described in the equipment in this embodiment and the lower end surface of the calciner cone is 0.7m, and the injection pipe is always in the reduction and decomposition zone, the angle between the nozzle center line of the injection pipe and the horizontal direction is 25°; the distance between the coal injection pipe in the reduction and decomposition zone and the lower end surface of the calciner cone 1m. The sectional area of ​​the tertiary air branch pipeline is 40% of the sectional area of ​​the tertiary air main pipeline. The total height of reduction decomposition zone and reduction inhibition zone is 12m.

[0072] There are four material injection pipes in the reduction and decomposition area 5-1, four coal injection pipes in th...

Embodiment 3

[0074] The connection relationship of the air-coal material classification low-nitrogen combustion equipment in this embodiment and the steps of the process are the same as in Embodiment 1, the difference is that there is only one tertiary air inlet for the tertiary air to enter the calciner, and the total tertiary air after passing through the tertiary air valve 14 There is only one tertiary wind branch pipeline on the pipeline. Two reduction and decomposition zone thermocouples are installed on the circle with a distance of 1m downward from the lower edge of the inlet of the tertiary air. The two reduction and decomposition zone thermocouples are located on the same circle, and the angle between them is 90°; A thermocouple in the reduction inhibition zone is installed on a circle with a distance of 1m upward from the upper edge of the inlet of the tertiary air;

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Abstract

The invention relates to air, coal and material graded low-nitrogen combustion equipment and process as well as a cement clinker sintering system. The air, coal and material graded low-nitrogen combustion equipment comprises a decomposition furnace, a tertiary air valve, a cyclone barrel, a rotary kiln and an overturning valve, and is characterized by further comprising a high-temperature-resisting air locking spiral conveyor, a Roots blower, an additionally-arranged tertiary air valve and a material distribution valve, wherein the decomposition furnace is provided with a tertiary air inlet and a separated new tertiary air inlet; a tertiary air general pipeline is connected with the tertiary air inlet of the decomposition furnace through the tertiary air valve; a tertiary air branch pipeline is arranged on the tertiary air general pipeline passing through the tertiary air valve; the additionally-arranged tertiary air valve is arranged on the tertiary air branch pipeline; the tertiary air branch pipeline is connected with the separated new tertiary air inlet through the additionally-arranged tertiary air valve; a region between the lower end face of a cone body of the decomposition furnace and the lower edge of the tertiary air inlet is a reduction decomposition region; and a region between the lower edge of the tertiary air inlet and the lower edge of the separated new tertiary air inlet is a reduction inhibition region.

Description

technical field [0001] The invention belongs to the technical field of cement production in the building material industry, and in particular relates to classified low-nitrogen combustion equipment and technology for wind-coal materials and a cement clinker burning system. Background technique [0002] In response to global climate change, my country has issued GB4915-2013 "Emission Standards of Air Pollutants for the Cement Industry", which requires cement enterprises to x ) emission standard is lower than 400mg / Nm 3 , key areas NO x Emission control at 320mg / Nm 3 within. After the new standard was formulated, due to the NO x The content is 800-1600mg / Nm 3 , the result of its low-nitrogen combustion technology has not yet reached the new standard, therefore, a subsequent treatment method that consumes a large amount of ammonia water has to be adopted to reduce NO x emissions, that is, ammonia denitrification technology (that is, the widely used SNCR method). The disa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C7/00C04B7/44
CPCY02E20/34
Inventor 郑德喜
Owner TIANJIN DECHENG ZHICHENG CEMENT BUILDING MATERIALTECH CONSULTATION SERVICES CO LTD
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