CN109731396B

CN109731396B - Preparation roller kilns removes dust and mixes fluidized bed with filter material

Info

Publication number: CN109731396B
Application number: CN201910181987.4A
Authority: CN
Inventors: 杨松
Original assignee: Individual
Current assignee: Lin Xiangui
Priority date: 2019-03-11
Filing date: 2019-03-11
Publication date: 2021-12-24
Anticipated expiration: 2039-03-11
Also published as: CN109731396A

Abstract

The invention relates to the technical field of environmental protection, in particular to a filter material mixing fluidized bed for dust removal of a roller kiln. The method is characterized in that: comprises an atomizing spray head, a fluidized bed body, a central cone, a multi-pipe cyclone dust collector, a buffer tank, a Roots blower, a vortex air duct and a spiral conveyor; the central vertebral canal is positioned and erected at the central position of the fluidized bed body through a supporting arch, the bottom of the central vertebral canal is provided with a slag discharging port, and the side surface of the central vertebral canal is provided with a discharging port; the atomizing nozzle is designed at the top end of the fluidized bed body, and the buffer tank is designed at the bottom of the fluidized bed body; the design of multitube cyclone is connected with the discharge port of central spinal canal outside the fluidized bed, and tail gas gets into in the central spinal canal through the slag hole, carries multitube cyclone through the discharge port again and purifies, and the tail gas after the purification obtains cyclic utilization through the transport of roots's fan, mixes with the ceramic particle of auger delivery ware input again, wraps up in the vortex wind channel that carries the ceramic particle and carry fluidized bed body top.

Description

Preparation roller kilns removes dust and mixes fluidized bed with filter material

Technical Field

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

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 filter material mixing fluidized bed for preparing the dust removal of a roller kiln, which is characterized in that: comprises an atomizing spray head, a fluidized bed body, a central cone, a multi-pipe cyclone dust collector, a buffer tank, a Roots blower, a vortex air duct and a spiral conveyor.

The central vertebral canal is positioned and erected at the central position of the fluidized bed body through a supporting arch, the bottom of the central vertebral canal is provided with a slag discharging port, and the side surface of the central vertebral canal is provided with a discharging port.

The atomizing nozzle is designed at the top end of the fluidized bed body, and the buffer tank is designed at the bottom of the fluidized bed body.

The multi-tube cyclone dust collector is designed to be connected with a discharge port of a central cone pipe outside the fluidized bed body, tail gas enters the central cone pipe through a slag discharge port and is conveyed to the multi-tube cyclone dust collector through the discharge port to be purified, the purified tail gas is conveyed by a Roots blower to be recycled and then 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.

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 ceramic raw material is ceramic particles ground by a ball mill, the fineness of the ceramic raw material 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 additionally included, if filter material particles with certain strength are prepared by extrusion forming, the filter material particles are required to be uniformly mixed by an adhesive, gelatinized starch is adopted as a binder, water is adopted as a diluent, the gelatinized starch is sprayed out from an atomizing spray nozzle designed at the top end of a fluidized bed body to form fog drops, the ceramic particles are input through a vortex air duct designed at the top end of the fluidized bed body, the gelatinized starch fog drops wrap the ceramic particles and spirally fall along the fluidized bed body under the action of gravity, and in the falling process, the longer the filter material particles formed by wrapping the ceramic particles by the gelatinized starch fog drops are, and the kinetic energy is lost during collision with the wall of the fluidized bed body and a central cone to be separated from tail gas, the tail gas enters the central vertebral tube through the slag hole and is conveyed to the multi-tube cyclone dust collector through the discharge hole to be purified, the purified tail gas is recycled through the conveying of the Roots blower and then is mixed with the ceramic particles input by the spiral conveyor, and the wrapped and clamped ceramic particles are conveyed to a vortex air duct at the top end of the fluidized bed body.

The inventor finds that the central cone pipe in the fluidized bed fluid design can effectively increase the collision probability of the 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 uniformity of the mixing of gelatinized 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.

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 ceramic particles by the filter material particles and the mixing uniformity of gelatinized starch and 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.

Drawings

FIG. 1 is a schematic structural view of a mixed fluidized bed for preparing filter material for dust removal of a roller kiln.

FIG. 2 is a schematic diagram of a partially enlarged structure A of a mixed fluidized bed for preparing filter materials for dust removal of a roller kiln.

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-a slag tap 10-a support arch 11-a screw conveyor.

Detailed Description

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

As shown in fig. 1 and 2, the preparation of the filter material mixing fluidized bed for roller kiln dust removal is characterized in that: comprises an atomizing nozzle 1, a fluidized bed body 2, a central cone 3, a multi-pipe cyclone dust collector 5, a buffer tank 6, a Roots blower 7, a vortex air duct 8 and a spiral conveyor 11.

The central vertebral canal 3 is positioned and erected at the center of the fluidized bed body 2 through a supporting arch 10, the bottom of the central vertebral canal is provided with a slag tap 9, and the side surface of the central vertebral canal is provided with a discharge port 4.

The atomizing spray head 1 is designed at the top end of the fluidized bed body 2, and the buffer tank 6 is designed at the bottom of the fluidized bed body 2.

The multi-tube cyclone dust collector 5 is designed outside the fluidized bed body 2 and is connected with a discharge port of the central cone 3, tail gas enters the central cone 2 through a slag discharge port 9 and is conveyed to the multi-tube cyclone dust collector 5 through the discharge port 4 for purification, the purified tail gas is recycled through the conveying of the Roots blower 7, and is mixed with ceramic particles input by the spiral conveyor 11, and the wrapped and clamped ceramic particles are conveyed to a vortex air duct 8 at the top end of the fluidized bed body 2.

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. The utility model provides a preparation roller kilns is filter material mixed fluidized bed for dust removal which characterized by: comprises an atomizing spray head, a fluidized bed body, a central cone, a multi-pipe cyclone dust collector, a buffer tank, a Roots blower, a vortex air duct and a spiral conveyor; the central cone pipe is erected at the central position of the fluidized bed body through the supporting arch positioning frame, the bottom of the central cone pipe is provided with a slag tap, the side surface of the central cone pipe is provided with a discharge port, and the central cone pipe can effectively increase the collision probability of filter material particles in the falling process of the filter material particles in the fluidized bed body, so that the filter material particles can lose kinetic energy more quickly, the separation from tail gas is realized, and the efficiency of collecting the ceramic particles by the filter material particles and the mixing uniformity of gelatinized starch and the ceramic particles are increased; the atomizing nozzle is designed at the top end of the fluidized bed body, and the buffer tank is designed at the bottom of the fluidized bed body; the multi-tube cyclone dust collector is designed to be connected with a discharge port of a central cone pipe outside a fluidized bed, tail gas enters the central cone pipe through a slag discharge port and is conveyed to the multi-tube cyclone dust collector for purification through the discharge port, the purified tail gas is conveyed by a Roots blower for recycling and is mixed with ceramic particles input by a screw conveyor, the wrapped ceramic particles are conveyed to a vortex air duct at the top end of the fluidized bed body, gelatinized starch is adopted as a binder, water is adopted as a diluent and is sprayed out from an atomizing spray head designed at the top end of the fluidized bed body to form fog drops, the ceramic particles are input through the vortex air duct designed at the top end of the fluidized bed body, the gelatinized starch fog drops wrap the ceramic particles and spirally fall along the fluidized bed body under the action of gravity, and in the falling process, the longer the larger the filter material particles formed by the gelatinized starch fog drops wrapping the ceramic particles grow are, and lose kinetic energy in collision with the fluidized bed body wall and the central cone pipe to be separated from the tail gas, falls into a buffer tank through the bottom of the fluidized bed body.