CN-122015495-A - Vertical multistage disc countercurrent hydrothermal pressurized roasting system and hydrothermal pressurized roasting method

CN122015495ACN 122015495 ACN122015495 ACN 122015495ACN-122015495-A

Abstract

A vertical multistage disc countercurrent hydrothermal pressurized roasting system and a hydrothermal pressurized roasting method belong to the field of chemical process equipment. Aiming at the problems of uneven temperature distribution, uncontrollable material residence time and difficult realization of pressurized continuous operation in the existing roasting equipment, a rotating structure with alternately arranged multi-stage large disks and small disks is constructed, and the periodic spiral migration of materials in the radial direction is realized through a bidirectional scraper system. The fixed heating source and the rotary heating plate are coupled, and a dynamic disturbance heat transfer mechanism is formed by combining periodic material turning, so that the heat transfer uniformity is improved. And a countercurrent operation mode of steam from bottom to top is introduced, a reinforced hydrothermal reaction field is constructed in a pressurized environment, and the mass transfer efficiency and the reaction effect are improved. Continuous and stable operation of the device under the airtight condition is realized through the feeding and discharging pressure isolation system. The invention realizes the conversion from traditional heat treatment to multi-field coupling reaction control in the roasting process, and has the advantages of high heat transfer efficiency, good reaction uniformity, high continuity degree and the like.

Inventors

ZHOU TIEZHUANG
ZHOU TAO
SHEN YANSHUN
QIN YUNLONG
LIU HAOLAN
XIE XIAOLING
FU YANAN

Assignees

天华化工机械及自动化研究设计院有限公司
天华院(南京)智能制造有限公司

Dates

Publication Date: 20260512
Application Date: 20260323

Claims (10)

1. The vertical multistage disc countercurrent hydrothermal pressurized roasting system is characterized by comprising a three-dimensional disc roasting furnace, wherein the top of the three-dimensional disc roasting furnace is connected with a feeding tank through a feeding pipe, the top of the three-dimensional disc roasting furnace is also connected with a tail gas recovery system through a gas outlet pipe, the bottom of the three-dimensional disc roasting furnace is connected with a discharging and discharging tank through a discharging pipe, and the bottom of the three-dimensional disc roasting furnace is also connected with a steam supply system through a steam pipeline; the three-dimensional disc roasting furnace is characterized by comprising a closed cylinder, wherein a fireproof heat-insulating layer is arranged on the inner wall of the cylinder, a rotary shaft is arranged in the middle of the cylinder, the rotary shaft is driven by a transmission system to rotate, a first type disc and a second type disc which rotate by a multi-stage rotary shaft are alternately fixed on the rotary shaft from top to bottom, heating devices are respectively fixed below the first type disc and the second type disc, a first type blanking scraper for conveying materials from the outer side to the inner side is arranged above the first type disc, a first discharging channel is arranged on the inner side of the first type disc, a second type blanking scraper for conveying the materials from the inner side to the outer side is arranged above the second type disc, a second discharging channel is arranged on the outer side edge of the second type disc, spiral and broken line type composite motion tracks are formed between the discs of all stages of materials, and steam is discharged from an air outlet pipe from bottom to top.
2. The vertical multistage disc counter-current hydrothermal pressure roasting system of claim 1, wherein the steam supply system comprises a steam generating device and a flow regulating device, and the flow regulating device is used for controlling the steam quantity of the water heating steam to be conveyed from bottom to top so that a proper amount of steam is in counter-current contact with materials moving from top to bottom.
3. The vertical multistage disc counter-current hydrothermal pressure roasting system of claim 1, wherein the first and second blades on the first and second types of blanking blades are inclined at angles of plus 10-60 ° and minus 10-60 °, respectively.
4. A vertical multistage disc counter-flow hydrothermal pressure roasting system according to claim 3, wherein the radial overlap ratio of the first scraper and the second scraper is 20% -80%.
5. The vertical multistage disc countercurrent hydrothermal pressure roasting system of claim 1, wherein the heating device is one or a combination of more of an electric radiant heating pipe, an electromagnetic induction heating device or a far infrared heating device which can be regulated and controlled independently, and a thermometer for observing the heating device is further arranged on the cylinder.
6. The vertical multistage disc countercurrent hydrothermal pressure roasting system of claim 1, wherein the feeding tank is a pressurized feeding tank, the discharging tank is a slow-release discharging tank, and continuous feeding and discharging are realized between the pressurized feeding tank and the slow-release discharging tank through pressure matching.
7. The vertical multistage disc counter-current hydrothermal pressure roasting system of claim 1, wherein the first type of discs are large discs and the second type of discs are small discs.
8. A method of hydrothermal press roasting of a vertical multistage disc counter-current hydrothermal press roasting system according to any of claims 1 to 7, wherein the method comprises the steps of: (1) Feeding the material to be treated into a feeding tank under the condition of pressurization, and feeding the material into a three-dimensional disc roasting furnace along with a feeding pipe; (2) Rotating the first type disc, the second type disc, the first type blanking scraper and the second type blanking scraper, wherein the materials move on each stage of discs in a folding line type mode under the action of the scrapers on each stage of discs and move downwards in each stage of discs step by step along a spiral path; (3) The steam supply system is characterized in that the bottom of the three-dimensional disc roasting furnace is filled with hydrothermal steam, so that the steam is in countercurrent contact with the materials and then is discharged from an air outlet pipe; (4) Starting a heating device to heat each stage of discs respectively, so that the materials are heated under the coupling action of conduction and convection and undergo hydrothermal reaction; (5) The residence time and the reaction condition of the materials in each stage of discs are controlled by adjusting the rotating speed of the discs, the angle of the scraper and the steam flow; (6) After roasting, the materials are continuously discharged through a bottom discharging pipe under the condition of maintaining pressure.
9. The hydrothermal press-roasting method of a vertical multistage disc counter-current hydrothermal press-roasting system according to claim 8, wherein the disc rotation speed is 0.1 to 10 rpm.
10. The hydrothermal pressure roasting method of the vertical multistage disc countercurrent hydrothermal pressure roasting system according to claim 8, wherein the roasting process is carried out under the conditions of a pressure of 0.1-1 MPa and a temperature of 200-600 ℃, and the material retention time is 0.5-6 h.

Description

Vertical multistage disc countercurrent hydrothermal pressurized roasting system and hydrothermal pressurized roasting method Technical Field The invention belongs to the technical field of chemical industry, and particularly relates to a vertical multistage disc countercurrent hydrothermal pressurized roasting system and a hydrothermal pressurized roasting method thereof. Background The roasting process is widely applied to the fields of chemical industry, metallurgy, catalytic material preparation and the like, and the existing industrial devices mostly adopt equipment such as a rotary roasting furnace and the like, and realize material conveying and heating through rotation of a cylinder. The equipment adjusts the motion state of materials depending on the inclination angle and the rotation speed, the residence time and the distribution of the equipment are difficult to control accurately, and the problems of insufficient reaction or local overheating and the like are easily caused. Meanwhile, in the traditional roasting process, the contact between materials and gas is uneven, the heat transfer and mass transfer efficiency is limited, the temperature field is unevenly distributed, and the quality stability of the product is affected. In addition, the existing equipment is mostly operated under normal pressure, and the continuous feeding and discharging of the pressurized roasting are difficult to realize, so that the hydrothermal reaction reinforcement and the industrialized application are restricted. Therefore, there is a need to develop a new roasting process and equipment that can achieve a controlled residence time, uniform heat transfer, and continuous pressurized operation. Disclosure of Invention Aiming at the defects of the existing roasting equipment in the aspects of heat transfer efficiency, material residence time control, continuous operation under pressurization and the like, the invention provides a vertical multistage disc countercurrent hydrothermal pressurized roasting process and a device thereof, and the multi-field strengthening and accurate regulation and control of the roasting process are realized through structural innovation and process coupling. The technical scheme provided by the invention is as follows: The vertical multistage disc counter-flow hydrothermal pressurized roasting system comprises a vertical disc roasting furnace, wherein the top of the vertical disc roasting furnace is connected with a feeding tank through a feeding pipe, the top of the vertical disc roasting furnace is connected with a tail gas recovery system through a gas outlet pipe, the bottom of the vertical disc roasting furnace is connected with a blanking discharging tank through a discharging pipe, the bottom of the vertical disc roasting furnace is connected with a steam supply system through a steam pipeline, the inner wall of the vertical disc roasting furnace comprises a sealed cylinder body, a fireproof heat-insulating layer is arranged on the inner wall of the cylinder body, a rotary shaft 47 is arranged in the middle of the cylinder body, the rotary shaft 47 rotates under the driving of a transmission system, a first type of discs and a second type of discs which rotate through multistage rotary shafts are alternately fixed from top to bottom, heating devices are respectively fixed below the first type of discs and the second type of discs, a first type of blanking scraper for conveying materials from the outer side to the inner side is arranged above the first type of discs, a first discharging channel is arranged above the first type of discs, a second type of blanking scraper for conveying materials from the inner side to the outer side is arranged at the edge of the second discs, a second discharging channel is arranged between the second discs, and each stage of spiral type of material discharging channel and each stage of the second discs form a spiral type discharging track from the outer side to the outer side on the discs. Further, the steam supply system comprises a steam generating device and a flow regulating device, wherein the flow regulating device is used for controlling the steam quantity of the water heating steam conveyed from bottom to top, so that a proper amount of steam and materials moving from top to bottom form countercurrent contact. Further, the inclination angles of the first scraper and the second scraper on the first type blanking scraper and the second type blanking scraper are respectively plus 10-60 degrees and minus 10-60 degrees. Further, the radial overlapping rate of the first scraper and the second scraper is 20% -80%. Further, the heating device is one or a combination of more of an electric radiant heating pipe, an electromagnetic induction heating device or a far infrared heating device which can be regulated and controlled independently, and the cylinder body is also provided with a thermometer for observing the heating device. Furthermore, the feed