CN109718597B

CN109718597B - Preparation method of filter material for roller kiln dust removal

Info

Publication number: CN109718597B
Application number: CN201910181245.1A
Authority: CN
Inventors: 杨松
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-11
Filing date: 2019-03-11
Publication date: 2022-02-01
Anticipated expiration: 2039-03-11
Also published as: CN109718597A

Abstract

The invention relates to the technical field of environmental protection, in particular to a filter material for roller kiln dust removal and a preparation method thereof. The method is characterized in that: opening a buffer tank, using pregelatinized starch as a binder and water as a diluent, spraying a prepared pregelatinized starch solution from an atomizing spray head designed at the top end of a fluidized bed body to form fog drops, enabling ceramic particles wrapped by the pregelatinized starch fog drops to spirally fall along the fluidized bed body under the action of gravity, enabling filter material particles grown by the ceramic particles wrapped by the pregelatinized starch fog drops to grow longer and larger, losing kinetic energy in collision with the wall of the fluidized bed body and a central vertebral canal and separating from tail gas in the falling process, enabling the filter material particles to fall into the buffer tank through the bottom of the fluidized bed body, enabling the filter material particles in the buffer tank to fall into a screw extruder, and gradually extruding and compacting by the resistance of a pore plate in the continuous pushing process of the screw, and extruding and molding through a die hole of the pore plate to prepare a cylindrical body with a honeycomb channel on the surface.

Description

Preparation method of filter material for roller kiln dust removal

Technical Field

The invention relates to the technical field of environmental protection, in particular to a preparation method of a filter material for roller kiln dust removal.

Background

The roller kiln is a tunnel kiln which is continuously fired by a rotating roller as a blank carrier, a combustion chamber of the roller kiln is generally designed below the roller, high-temperature flue gas in the combustion chamber heats and sinters the blank, particulate matters in the discharged flue gas are gaseous pollutants and can be intercepted and purified through a particle filter material layer, the preparation of the particle filter material by utilizing argil raw materials is undoubtedly a way with higher efficiency-cost ratio, and a device for uniformly mixing and extruding and forming required by the preparation of the particle filter material is a technical problem to be solved. The Chinese invention patent (patent application number 201811222140.8, named as a dry particle mixing device) discloses a dry particle mixing device, which is characterized by comprising a mixing bin and a stirrer arranged in the mixing bin; the stirrer consists of a stirring shaft and at least 3 stirring blades; stirring vane and (mixing) shaft junction are equipped with fan-shaped rib, and the region that every stirring vane is close to the outside edge is the bare board district, is equipped with a plurality of compounding holes along transversely and vertically on the stirring vane outside the bare board district, and it is protruding that the while distributes and be equipped with a plurality of compounding on the stirring vane outside the bare board district, and mixing hole and compounding are protruding to be regular distribution on stirring vane. The invention utilizes the light panel area on the stirring blade to drive all the particles to move, so that the particles flow on the stirring blade, the particles are continuously shunted and converged after contacting with the mixing hole and the mixing protrusion, and the mixing protrusion can also change the original movement direction of the particles, so that the movement direction of the particles is more irregular, thereby loosening the particle substances and finally achieving the ideal mixing uniformity. The Chinese invention patent (patent application No. 201810293472.9, named as a fluidized bed with ordered structure and mixed ultrafine particles) discloses a fluidized bed with ordered structure and mixed ultrafine particles, which is characterized by comprising a guide pipe arranged in the middle of an outer cylinder, a grid type baffle arranged in an annular area between the guide pipe and the outer cylinder, an air distribution plate arranged below the guide pipe and the grid type baffle, and a central jet pipe arranged in the middle of the air distribution plate and corresponding to the guide pipe. The invention can orderly organize the particle mixing of the ultrafine particle fluidized bed, strengthen the particle circulation flow in the fluidized bed, improve the gas-solid two-phase contact efficiency, well improve the fluidization of the ultrafine particles, and has stable operation and easy maintenance.

In the prior art 1, the traditional stirring method is adopted to realize uniform mixing, but pottery clay with the fineness of 800-1200 meshes is mixed with water and then aggregated into clusters due to the acting force of hydrogen bonds, so that the pottery clay and a binder are not easy to disperse uniformly; in the prior art 2, the ordered organization of ultrafine particle fluidized bed particles strengthens the circulating flow of particles in the fluidized bed, improves the contact efficiency of gas and solid phases and well improves the fluidization of ultrafine particles.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a preparation method of a filter material for roller kiln dust removal, which is characterized by comprising the following steps: the filter material comprises, by weight, 100 parts of aggregate ceramic particles, 1-1.5 parts of binder pregelatinized starch and 30-50 parts of diluent water. The preparation method of the filter material comprises the following steps:

step one, preparing a pre-gelatinized starch solution, namely preparing 1-1.5 parts of pre-gelatinized starch and 30-50 parts of water by weight, uniformly stirring at normal temperature and standing for 10min for later use, adjusting a corresponding metering device of an atomizing nozzle and a screw conveyor, and setting according to the proportion of 100 parts of ceramic particles and 31-51.5 parts of the pre-gelatinized starch solution.

And step two, checking the running state of the screw extrusion component when the screw extrusion component is in no-load before use to ensure that the screw extruder and the machine head component run normally, simultaneously, trying to run the fluidization working state of the fluidization mixing component, starting the Roots blower, mixing the driving airflow with the ceramic particles conveyed from the screw conveyor, feeding the mixture into a fluidization bed body through a vortex air channel, and keeping the buffer tank in a closed state and running continuously to ensure that the air pressure reaches the design index.

Opening a buffer tank, using pre-gelatinized starch as a binder and water as a diluent, spraying the prepared pre-gelatinized starch solution from an atomizing spray head designed at the top end of a fluidized bed body to form droplets, enabling the ceramic particles wrapped by the pre-gelatinized starch droplets to spirally fall along the fluidized bed body under the action of gravity, enabling the filter material particles grown by the ceramic particles wrapped by the pre-gelatinized starch droplets to grow larger and larger in size in the falling process, losing kinetic energy in collision with the wall of the fluidized bed body and a central cone tube to be separated from tail gas, falling into the buffer tank through the bottom of the fluidized bed body, erecting the central cone tube at the central position of the fluidized bed body through a support arch, designing a slag discharge port at the bottom, designing a discharge port at the side, enabling the tail gas to enter the central multi-cone tube through the slag discharge port, conveying the tail gas to a cyclone dust collector through the discharge port for purification, and conveying the purified tail gas to be recycled through a Roots blower, then the mixture is mixed with ceramic particles input by a screw conveyor, and the wrapped ceramic particles are conveyed to a vortex air duct at the top end of the fluidized bed body.

And step four, after the filter material particles in the buffer tank fall into a screw extruder, gradually extruding and compacting by the resistance of the pore plate in the process of continuously pushing the screw, extruding and molding by the die hole of the pore plate to prepare a cylindrical body with a honeycomb channel on the surface, starting a speed reducer to drive a chain wheel assembly to rotate when the extrusion design length reaches 10-12 mm, driving a cutting knife which is parallel and tightly attached to the surface of the pore plate to synchronously rotate, finishing cutting work after rotating for 180 degrees, repeating the process to continuously produce the filter material particles, and emptying the filter material particles in the screw and cleaning the filter material particles in the die holes of the machine head body and the pore plate when stopping production.

The inventor finds that the local material utilization of ceramic raw materials for preparing filter material particles is undoubtedly a way with higher efficiency-cost ratio, the filter material particles are extruded and formed, honeycomb channels are formed on the surfaces of the filter material particles, the ceramic particles in the waste gas discharged by the roller kiln are mixed with water and then agglomerated and adhered to the honeycomb channels on the surfaces of the filter material particles for growth, as is well known, factors influencing the trapping efficiency of the particle layer filter mainly comprise the diameter of the filter material particles and the height of a bed layer, the growth of the filter material particles and the increase of the pressure drop when the mutual gaps are filled to improve the trapping efficiency, therefore, the filter material particles supplement the updated filter material particles while moving and falling to keep a certain pressure drop of the particle layer filter, and therefore, the purification efficiency of the particles in the waste gas discharged by the roller kiln is ensured.

The inventor finds that the filter material particles comprise 100 parts of aggregate ceramic particles, 1-1.5 parts of binder pregelatinized starch and 30-50 parts of diluent water in parts by weight. The ceramic raw material is ceramic particles ground by a ball mill, the fineness of the ceramic particles reaches 800-1200 meshes, the main components are silicon dioxide and aluminum oxide, and impurities such as ferric oxide, calcium oxide, magnesium oxide, water, organic matters and the like are added, if the filter material particles with certain strength are prepared by extrusion molding, the filter material particles must be uniformly mixed by using an adhesive, and the uniform mixing is difficult to realize by using a mechanical stirring method because the specific surface area of the ceramic particles is large, the solution is difficult to infiltrate the surfaces of the ceramic particles, and if a large amount of diluent is added, the subsequent preparation of filter material particles requires a drying process, so the method does not meet the aims of energy conservation and cost saving, therefore, the scheme adopts the pre-gelatinized starch as the binder and water as the diluent to prepare the pre-gelatinized starch solution firstly, then atomized into mist liquid drops which are mixed with the ceramic particles in the gas flow, thereby greatly increasing the interphase contact and mass transfer efficiency of liquid and solid phases.

The inventor finds that 1-1.5 parts of pregelatinized starch and 30-50 parts of water are prepared into a pregelatinized starch solution by weight, the obtained pregelatinized starch solution is sprayed out from an atomizing spray head designed at the top end of a fluidized bed body to form fog drops, ceramic particles are input through a vortex air duct designed at the top end of the fluidized bed body, the ceramic particles wrapped by the pregelatinized starch fog drops fall spirally along the fluidized bed body under the action of gravity, in the falling process, filter material particles grown by wrapping the ceramic particles by the pregelatinized starch fog drops grow longer and larger, lose kinetic energy and are separated from tail gas in collision with the wall of the fluidized bed and a central vertebral canal, the tail gas falls into a buffer tank through the bottom of the fluidized bed body, the central vertebral canal is erected at the central position of the fluidized bed body through a supporting arch, a slag discharge port is designed at the bottom, a discharge port is designed at the side surface, the tail gas enters the central vertebral canal through the slag discharge port and is conveyed to a multi-tube cyclone dust collector for purification, the purified tail gas is conveyed by the Roots blower to be recycled, then is mixed with the ceramic particles input by the screw conveyor, and the wrapped ceramic particles are conveyed to the vortex air duct at the top end of the fluidized bed body.

The inventor finds that the central cone pipe in the fluidized bed body design can effectively increase the collision probability of filter material particles in the falling process, so that the filter material particles can lose kinetic energy more quickly, and the separation from tail gas is realized, in other words, the efficiency of the filter material particles for capturing ceramic particles and the mixing uniformity of pregelatinized starch and the ceramic particles are increased.

The inventor finds that the tail gas recycled is used as a process medium for finishing the conveying, mixing and separating of the filter material particles, and the tail gas is circularly and repeatedly operated in the fluidized bed, so that the preparation process of the filter material particles is effectively realized, and the environmental pollution caused by the emission of gaseous pollutants is avoided.

The inventor finds that after the filter material particles in the buffer tank fall into the screw extruder, the filter material particles are gradually extruded and compacted by the resistance of the pore plate in the process of continuously pushing the screw, a cylindrical body with a honeycomb channel on the surface is manufactured after extrusion molding through the pore plate, when the extrusion design length reaches 10-12 mm, the speed reducer is started to drive the chain wheel assembly to rotate, the cutting knife which is parallel and tightly attached to the pore plate surface is driven to synchronously rotate, cutting work is completed after the rotation is carried out for 180 degrees, the filter material particles are continuously produced by repeating the process, and the filter material particles in the screw must be emptied and the filter material particles in the head body and the pore plate are cleaned to remain when the production is stopped.

Compared with the prior art, the invention at least has the following advantages: firstly, the collision probability of filter material particles in the falling process can be effectively increased by designing the central cone tube in the fluidized bed, so that the filter material particles can lose kinetic energy more quickly, and the separation from tail gas is realized, in other words, the efficiency of collecting the ceramic particles by the filter material particles and the mixing uniformity of pregelatinized starch and the ceramic particles are increased; secondly, the tail gas which is recycled is used as a process medium for finishing the conveying, mixing and separating of the filter material particles, and the tail gas is circularly and repeatedly operated in a fluidized bed, so that the preparation process of the filter material particles is effectively realized, and the environmental pollution caused by the emission of gaseous pollutants is avoided; thirdly, the filter material particles are prepared by using local materials and ceramic raw materials, so that the cost is saved and the automatic continuous production is realized; fourthly, by adopting the pre-gelatinized starch as a binder and water as a diluent, firstly preparing a pre-gelatinized starch solution, then atomizing the pre-gelatinized starch solution into mist liquid drops, and mixing the mist liquid drops with the ceramic particles in the air flow, the interphase contact and mass transfer efficiency of liquid and solid phases is greatly increased, the energy is saved, and the cost is saved.

Drawings

FIG. 1 is a schematic structural view of a preparation method of a filter material for dust removal of a roller kiln.

FIG. 2 is a schematic diagram of a partially enlarged structure A of the preparation method of the filter material for dust removal of the roller kiln.

FIG. 3 is a schematic diagram of a structure in the direction B of the method for preparing the filter material for dust removal of the roller kiln.

FIG. 4 is a schematic diagram of a partially enlarged structure C of the filter material for dust removal in a roller kiln according to the present invention.

FIG. 5 is a schematic diagram of a partial enlarged structure D of the method for preparing the filter material for dust removal of the roller kiln.

I-fluidized mixing assembly and II-screw extrusion assembly

1-atomizing nozzle 2-fluidized bed body 3-central vertebral canal 4-discharge port

5-multi-pipe cyclone dust collector 6-buffer tank 7-Roots blower 8-vortex air duct

9-slag hole 10-supporting arch 11-screw conveyer 12-screw extruder

13-head assembly 14-speed reducer 15-head body 16-orifice plate 17-chain wheel assembly

18-cutting knife 19-die hole.

Detailed Description

The invention is further described with reference to the following detailed description of embodiments and drawings.

As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the preparation method of the filter material for roller kiln dust removal is characterized in that: the filter material comprises, by weight, 100 parts of aggregate ceramic particles, 1-1.5 parts of binder pregelatinized starch and 30-50 parts of diluent water. The preparation method of the filter material comprises the following steps:

step one, preparing a pre-gelatinized starch solution, namely preparing 1-1.5 parts of pre-gelatinized starch and 30-50 parts of water by weight, uniformly stirring at normal temperature and standing for 10min for later use, adjusting corresponding metering devices of an atomizing spray head 1 and a screw conveyor 11, and setting according to the ratio of 100 parts of ceramic particles to 31-51.5 parts of the pre-gelatinized starch solution.

And step two, checking the running state of the screw extrusion component II in no-load before use to ensure that the screw extruder 12 and the machine head component 13 run normally, simultaneously, running the fluidization working state of the fluidization mixing component I in a trial mode, starting the Roots blower 7, mixing the driving airflow with the ceramic particles conveyed from the screw conveyor 11, conveying the mixture into the fluidized bed body 2 through the vortex air duct 8, at the moment, enabling the buffer tank 6 to be in a closed state, and continuously running to ensure that the air pressure reaches the design index.

Step three, opening a buffer tank 6, using pregelatinized starch as a binder and water as a diluent, spraying from an atomizing nozzle 1 designed at the top end of a fluidized bed body 2 to form fog drops, enabling ceramic particles wrapped by the pregelatinized starch fog drops to spirally fall along the fluidized bed body 2 under the action of gravity, enabling filter material particles grown by the ceramic particles wrapped by the pregelatinized starch fog drops to grow longer and larger, losing kinetic energy in collision with the wall of the fluidized bed body 2 and a central cone 3 and separating the filter material particles from tail gas, enabling the tail gas to fall into the buffer tank 6 through the bottom of the fluidized bed body 2, enabling the central cone 3 to be erected at the central position of the fluidized bed body 2 through a supporting arch 10, designing a slag discharge port 9 at the bottom and a discharge port 4 at the side, enabling the tail gas to enter the central cone 3 through the slag discharge port 9 and then be conveyed to a multi-tube cyclone dust collector 5 through the discharge port 4 for purification, and enabling the purified tail gas to be recycled through conveying of a Roots blower 7, then mixed with the ceramic particles input by the screw conveyor 11, and the wrapped ceramic particles are conveyed to the vortex air duct 8 at the top end of the fluidized bed body 2.

Step four, after the filter material particles in the buffer tank 6 fall into the screw extruder 12, in the process of continuously pushing the screw, the filter material particles are gradually extruded and compacted by the resistance of the pore plate 16, a cylindrical body with a honeycomb channel on the surface is manufactured after being extruded and molded by the die hole 19 of the pore plate 16, when the extrusion design length reaches 10-12 mm, the speed reducer 14 is started to drive the chain wheel assembly 17 to rotate, the cutting knife 18 which is in parallel and clings to the surface of the pore plate 16 is driven to synchronously rotate, the cutting work is completed after the rotation is carried out for 180 degrees, the process is repeated to continuously produce the filter material particles, and the filter material particles in the screw must be emptied and the filter material particles in the machine head body 15 and the die hole 19 of the pore plate 16 must be cleaned when the production is stopped.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A preparation method of a filter material for roller kiln dust removal is characterized by comprising the following steps: the filter material comprises, by weight, 100 parts of aggregate ceramic particles, 1-1.5 parts of binder pregelatinized starch and 30-50 parts of diluent water; the preparation method of the filter material comprises the following steps: preparing a pre-gelatinized starch solution, namely preparing 1-1.5 parts of pre-gelatinized starch and 30-50 parts of water by weight, uniformly stirring at normal temperature and standing for 10min for later use, adjusting a corresponding metering device of an atomizing nozzle and a screw conveyor, and setting according to the proportion of 100 parts of ceramic particles and 31-51.5 parts of the pre-gelatinized starch solution; checking the running state of the screw extrusion component when the screw extrusion component is in no-load before use to ensure that the screw extruder and the machine head component run normally, simultaneously running the fluidization mixing component in a trial run fluidization working state, starting the Roots blower, mixing a driving airflow with the ceramic particles conveyed from the screw conveyor, and sending the mixture into a fluidization bed body through a vortex air duct, wherein at the moment, the buffer tank is in a closed state, and the continuous running ensures that the air pressure reaches a design index; step three, opening a buffer tank, using pregelatinized starch as a binder and water as a diluent, spraying the prepared pregelatinized starch solution from an atomizing spray head designed at the top end of a fluidized bed body to form fog drops, enabling ceramic particles wrapped by the pregelatinized starch fog drops to spirally fall along the fluidized bed body under the action of gravity, enabling filter material particles grown by wrapping the ceramic particles by the pregelatinized starch fog drops to grow larger and larger, losing kinetic energy in collision with the wall of the fluidized bed body and a central cone tube to be separated from tail gas in the falling process, enabling the filter material particles to effectively increase the collision probability in the falling process of the particle filter material by the central cone tube designed in the fluidized bed body, enabling the filter material particles to lose the kinetic energy more quickly, further realizing the separation from the tail gas, increasing the efficiency of the filter material particles for capturing the ceramic particles and the uniformity of the pregelatinized starch and the ceramic particles, and erecting the central cone tube at the central position of the fluidized bed body through a supporting arch positioning frame, a slag tap is designed at the bottom, a discharge port is designed at the side surface, tail gas enters the central cone tube through the slag tap and is conveyed to the multi-tube cyclone dust collector through the discharge port to be purified, the purified tail gas is conveyed by the Roots blower to be recycled, and is mixed with ceramic particles input by the screw conveyor, and the wrapped ceramic particles are conveyed to a vortex air duct at the top end of the fluidized bed body; and step four, after the filter material particles in the buffer tank fall into a screw extruder, gradually extruding and compacting by the resistance of the pore plate in the process of continuously pushing the screw, extruding and molding by the die hole of the pore plate to prepare a cylindrical body with a honeycomb channel on the surface, starting a speed reducer to drive a chain wheel assembly to rotate when the extrusion design length reaches 10-12 mm, driving a cutting knife which is parallel and tightly attached to the surface of the pore plate to synchronously rotate, finishing cutting work after rotating for 180 degrees, repeating the process to continuously produce the filter material particles, and emptying the filter material particles in the screw and cleaning the filter material particles in the die holes of the machine head body and the pore plate when stopping production.