Cement kiln system high-temperature raw material online desulfurization technology

A cement kiln, high temperature technology, applied in membrane technology, gas treatment, dispersed particle separation, etc., can solve the problems of unfavorable energy saving, environmental protection, large amount of raw meal at high temperature, etc.

Inactive Publication Date: 2021-05-18
于庆起
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The molar ratio of calcium to sulfur is the number of moles of CaO that react with SO2. The desulfurization efficiency usually increases with the increase of the molar ratio of calcium to sulfur. Conducive to energy saving and environmental protection of the system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Determine the best feeding location and feeding location, and extract high-temperature raw meal powder from a reasonable feeding location;

[0020] Step 2: After scientifically and reasonably integrating and processing through the diversion pipeline, integrated module and control module designed by the device, the gas rich in active CaO is introduced into a reasonable feeding position in an appropriate amount;

[0021] Step 3: The extracted high-temperature raw material gas is fully mixed and contacted with the sulfur-containing flue gas collected by the first-stage cyclone, and the CaO and SOx in the flue gas 2 A chemical reaction occurs to generate highly stable calcium sulfate;

[0022] Step 4: The dust containing calcium sulfate is collected by the original device, and sent back to the raw material homogenization warehouse through the original conveying equipment, and the clean exhaust gas is discharged from the chimney at the end of the kiln.

[0023] Amon...

Embodiment 2

[0026] Example 2: The average residence time of high-temperature raw meal and flue gas in the humidification pipeline can reach 8.0-10.0s, and the average reaction temperature can reach 300°C, and the amount of water sprayed in the humidification pipeline is 2-4t / h, theoretically The moisture content of the flue gas can be increased by about 1.6%, which will be more conducive to the desulfurization reaction.

[0027] The molar ratio of calcium to sulfur, according to the previous project operation experience, the initial SO 2 When the concentration is reduced from 150-200mg / Nm3 to 50mg / Nm3, the molar ratio of calcium to sulfur is generally 15-20; 2 When the initial concentration is reduced from 300-500mg / Nm3 to 50mg / Nm3, the molar ratio of calcium to sulfur is generally 30-40. When the SO2 emission concentration is less than 300mg / Nm3, use the pipeline from the calciner to the C2 ascending flue. When the SO2 emission concentration When it is greater than 300mg / Nm3, the pipeli...

Embodiment 3

[0029] Embodiment 3: The system pipeline is scientifically and rationally designed according to the actual situation on site, to ensure the smooth flow of the pipeline while minimizing the pressure loss, to ensure the smooth flow of the pipeline, and the stable operation of the system. The whole system is programmed by the PLC centralized control cabinet next to the machine Control, the control cabinet is equipped with a communication interface with DCS, which can realize remote control, and all system parameters and controls can be uniformly operated by DCS system staff.

[0030] SO 2 When the emission value does not exceed the standard, it is not necessary to open the valve of the desulfurization system for desulfurization. After the raw material mill is shut down, according to the SO 2 The discharge value of the desulfurization system can be adjusted according to the valve opening of the desulfurization system for desulfurization. 2 The concentration change is adjusted at ...

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PUM

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Abstract

The invention discloses a cement kiln system high-temperature raw material online desulfurization technology, which comprises the following steps: 1, determining an optimal material taking position and an optimal feeding position, and extracting high-temperature raw material powder from the reasonable material taking position; 2, carrying out scientific and reasonable integration through a flow guide pipeline, an integration module and a control module designed by a device, and after treatment, respectively introducing a proper amount of gas rich in active CaO into reasonable feeding positions; 3, fully mixing and contacting extracted high-temperature raw material gas with sulfur-containing flue gas collected by a first-stage cyclone cylinder, and generating high-stability calcium sulfate through kiln tail series equipment and a waste gas pipeline; and 4, collecting dust containing calcium sulfate by the original device, and discharging clean waste gas from a kiln tail chimney. According to the cement kiln system high-temperature raw material online desulfurization technology, a plurality of connecting pipelines such as a preheater C2 outlet pipeline, a humidifying tower inlet and the like, and a control system can be utilized to increase the reaction opportunity of CaO and SO2 to prolong the reaction time, so that the CaO desulfurization efficiency is greatly improved.

Description

technical field [0001] The invention relates, in particular, to the online desulfurization technology of high-temperature raw meal in a cement kiln system, and belongs to the technical field of cement kiln desulfurization. Background technique [0002] Cement kiln SO 2 Process emission reduction technology, mainly through high-efficiency desulfurization technology of high-temperature raw materials in cement kilns, CFD simulation optimization, theoretical support, thermal calibration, on-site guidance, construction drawing design and other technologies. Zhuzhou Lvjiajing Environmental Protection Engineering Co., Ltd. has been insisting on the development and implementation of self-cleaning desulfurization and denitrification technology of cement kiln system. Through the characteristics of cement production process and alkaline raw materials, the purpose of self-cleaning of sulfur dioxide in the production process is realized. The self-developed cement kiln bypass ventilation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/83
CPCB01D53/508B01D53/83B01D2251/404B01D2251/602B01D2258/0283
Inventor 于庆起
Owner 于庆起
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