Continuous thermal treatment and activation apparatus for sediment and control method thereof

Abstract

This invention discloses a continuous heat treatment and activation device and its control method for sludge, applicable to a continuous processing system for converting reservoir sludge and aqueous sediments into low-carbon cement (LC³) raw materials. The device mainly includes a low-moisture feeding and loosening unit, a continuously conveying multi-segment heat treatment channel, a zoned independent temperature control system, a low-oxygen atmosphere control unit, and an amorphization endpoint sensing and feedback control unit. Through a clump-breaking and quantitative conveying mechanism, the sludge enters the heat treatment zone in a loose and homogeneous state, avoiding agglomeration and localized overheating. The multi-segment heat treatment channel is sequentially equipped with a desorption zone, a dehydroxylation reaction zone, and an activation zone along the conveying direction. Each zone has independent heating and temperature control capabilities, allowing the material to gradually complete the removal of free water, removal of structural hydroxyl groups, and amorphization activation reactions. The low-oxygen atmosphere control unit maintains a low-oxygen partial pressure environment in at least some reaction zones through the introduction of inert gas and tail gas recovery and recirculation, thereby suppressing the tendency of crystalline phase rearrangement and recrystallization and increasing the proportion of amorphous phase. The amorphization endpoint sensing unit uses infrared spectroscopy, dielectric properties, or exhaust characteristic signals to determine the degree of material structural transformation and feeds the signal back to the control system in real time. This system automatically adjusts the heating power, atmosphere conditions, or material residence time to form a closed-loop operation control, thereby avoiding over-calcination that could lead to recrystallization and reducing unit processing energy consumption.

Claims

1. A continuous heat treatment and activation apparatus for sludge, characterized in that it comprises: A feeding module is used to continuously input water-containing sludge raw materials; A multi-section continuous conveying heat treatment channel is located inside a heating shell; Multiple heating sections are arranged sequentially along the conveying direction, each heating section having an independent heat source control unit; an atmosphere control module for regulating the oxygen partial pressure conditions within the heat treatment channel; and at least one process sensing module for measuring temperature, gas composition, or material state parameters. And a control unit, which adjusts the output and atmosphere conditions of each heating zone according to the sensing signal, so that the sludge completes the activation process during continuous passage, in order to control the end point of heat treatment according to the degree of amorphization of the material.

2. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The moisture content of the water-containing sludge raw material input into the feeding module is controlled at 15–40 wt%.

3. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The heating section of this multi-segment continuous conveying heat treatment channel is provided with at least the following three temperature zones: a desorption zone of 200–350°C, a dehydroxylation reaction zone of 500–750°C, and an activation zone of 700–900°C. The desorption zone is used to remove free water; the dehydroxylation reaction zone is used to remove structural hydroxyl groups; and the activation zone is used to perform an amorphization activation reaction.

4. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The multi-segment continuous conveying heat treatment channel is one of the following: a rotary channel, a belt channel, a spiral conveying channel, or a propulsion channel.

5. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The multiple heating zones have independent temperature setting and power control capabilities.

6. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The atmosphere control module includes an inert gas introduction unit or a low-oxygen gas circulation unit.

7. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The atmosphere control module can maintain the oxygen partial pressure in the heat treatment section below a predetermined ratio; the predetermined ratio of the oxygen partial pressure is below 15%.

8. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The sensing module includes one or a combination of an infrared spectroscopy sensor, a gas concentration sensor, or a material reaction state sensor.

9. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The control unit includes an amorphization endpoint determination module.

10. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The control unit determines the activation endpoint based on the amorphous phase ratio or spectral characteristics of the material, and is used to control the activation endpoint of the material.

11. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The output of at least some heating sections is adjusted according to the material moisture content signal.

12. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, It is equipped with a preheating zone to preheat raw materials using waste heat from exhaust gas.

13. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The control unit adjusts the heating power of the downstream section according to the degree of amorphous phase formation.

14. A continuous heat treatment and activation apparatus for sludge as described in claim 1, wherein, The device is mounted on a modular or movable base.

15. A method for continuous heat treatment and activation control of sludge, applied to the apparatus of claim 1, comprising: Continuous input of sludge raw materials; The sludge is passed sequentially through multiple heating zones; Real-time measurement of process temperature and material reaction status signals; The activation process is determined based on the signal; the heating output and atmosphere conditions of each section are dynamically adjusted; and the heating output is reduced or terminated when the activation endpoint is determined to be reached.

16. A continuous heat treatment and activation control method for sludge as described in claim 15, wherein, The determination criteria include changes in spectral characteristics.

17. A continuous heat treatment and activation control method for sludge as described in claim 15, wherein the control unit dynamically adjusts the conveying speed according to the material residence time.

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