CN219433804U - Raw material preheating device for expanded perlite production - Google Patents

Abstract

The utility model relates to a raw material preheating device for expanded perlite production, which comprises a preheating furnace and a predrying device, wherein the predrying device comprises an outer cylinder, an inner cylinder and a central tube which are coaxially arranged from outside to inside, a peripheral heat exchange channel is arranged between the inner cylinder and the outer cylinder, a predrying feeding port for perlite to enter the inner cylinder is arranged at the upper end of the outer cylinder, an outer cylinder air inlet communicated with a hot air outlet of the preheating furnace is arranged at the upper end of the outer cylinder, hot air enters the peripheral heat exchange channel through the outer cylinder air inlet, and an outer cylinder air outlet is arranged at the lower end of the outer cylinder; the lower end of the inner cylinder is provided with a pre-drying discharge hole and extends out of the outer cylinder through a pre-drying discharge pipe to be connected with a feed inlet of the preheating furnace, the upper end of the central pipe extends out of the upper end of the outer cylinder and is provided with a central pipe air inlet communicated with a hot air outlet of the preheating furnace, and the lower end of the central pipe extends out of the lower end of the inner cylinder and is provided with a central pipe air outlet. According to the utility model, the inner side and the outer side of the perlite are simultaneously dried and heated by using the thermal dryer, so that the residual heat in the hot air can be fully utilized.

Description

Raw material preheating device for expanded perlite production

Technical Field

The utility model relates to the technical field of expanded perlite production equipment, in particular to a raw material preheating device for expanded perlite production.

Background

The product of the volcanic vitreous baked rock after cooling and condensing is named perlite, and the perlite is named expanded perlite after crushing, grading, preheating and high-temperature roasting and instant volume expansion for 10-25 times. The expanded perlite has the multifunctional characteristics of porous interior, low heat conductivity, fire resistance, sound absorption and the like, is widely applied to the fields of building, electric power, chemical industry, gardens and the like, and has the purposes of heat insulation materials, soilless culture substrates, pesticide carriers and the like.

The production equipment of the expanded perlite mainly comprises preheating equipment, expansion equipment, separation equipment and recovery storage equipment, wherein the main body of the preheating equipment is generally a preheating furnace, hot air is utilized to preheat the perlite, the water content of the perlite is reduced, if hot air after preheating the perlite is directly discharged into the air, larger heat energy waste is formed, and the heat utilization rate is not high, so that the technical means of additionally arranging the pre-drying equipment at the front end of the preheating furnace at present is provided, the pre-drying equipment is internally provided with a perlite cavity and an annular interlayer positioned at the periphery of the perlite, and the hot air in the preheating furnace is led to the interlayer to exchange heat with the perlite, so that the effect of waste heat utilization is achieved; the pre-drying equipment can achieve the purposes of utilizing waste heat and reducing energy waste, but only the outer perlite can contact heat exchange and heat absorption is not thorough due to short heat exchange time and limited heat exchange contact area, and more heat is still wasted and the energy utilization rate is not high.

Disclosure of Invention

The utility model aims to provide a raw material preheating device for expanded perlite production, which can solve the problems of large heat waste and low energy utilization rate in the existing expanded perlite preheating process.

The utility model provides the following technical scheme: the raw material preheating device for producing the expanded perlite comprises a preheating furnace and a pre-dryer arranged at the front end of the preheating furnace and used for feeding the preheating furnace, wherein the pre-dryer comprises an outer cylinder, an inner cylinder and a central tube which are coaxially arranged from outside to inside, the upper end and the lower end of the outer cylinder are closed, the inner cylinder is fixed inside the outer cylinder, a peripheral heat exchange channel is arranged between the inner cylinder and the outer cylinder, a pre-drying feed inlet for the perlite to enter the inner cylinder and an outer cylinder air inlet communicated with a hot air outlet of the preheating furnace are arranged at the upper end of the outer cylinder, the outer cylinder air inlet is used for the hot air to enter the peripheral heat exchange channel, and an outer cylinder air outlet is arranged at the lower end of the outer cylinder; the lower end of the inner cylinder is provided with a pre-drying discharge hole and extends out of the outer cylinder through a pre-drying discharge pipe to be connected with a feed inlet of the preheating furnace, the upper end of the central pipe extends out of the upper end of the outer cylinder and is provided with a central pipe air inlet communicated with a hot air outlet of the preheating furnace, the lower end of the central pipe extends out of the lower end of the inner cylinder and is provided with a central pipe air outlet, a central spiral blade is fixed in the central pipe, and a peripheral spiral blade positioned in a peripheral heat exchange channel is fixed on the inner wall of the outer cylinder.

Further, a raw material preheating device for expanded perlite production still includes drive rotary mechanism, and upper and lower both ends of center tube are connected with urceolus, inner tube rotation respectively through the bearing, and drive rotary mechanism is located the urceolus outside, including driving motor and driving gear, and driving gear sets up in driving motor's output, and the center tube upper end outside sets up the driven ring gear with driving gear meshing transmission, and the center tube outer wall sets up and is used for stirring the agitator to the perlite, and the center tube upper end sets up rotary joint.

Further, the preheating furnace comprises a perlite cylinder and a preheating cylinder positioned at the outer side of the perlite cylinder, a preheating annulus is arranged between the preheating cylinder and the perlite cylinder, a preheating air inlet and a hot air outlet are respectively arranged at two ends of the preheating cylinder, a preheating furnace feed inlet is positioned on the perlite cylinder, a preheating furnace discharge outlet is arranged on the perlite cylinder, a discharge pipe extending out of the preheating cylinder is arranged at the outer side of the preheating furnace discharge outlet, spiral conveying blades are arranged inside the perlite cylinder, a conveying motor for driving the spiral conveying blades to rotate is arranged outside the preheating furnace, and an insulating layer is arranged outside the preheating cylinder.

The beneficial effects are that: when the utility model is used for preheating perlite, hot air generated in the process of preheating perlite in the preheating furnace is discharged out of the hot air outlet and then enters the pre-dryer for recycling, and the perlite which is not preheated is pre-dried: the method comprises the steps that the pearls enter an inner barrel through a pre-drying feed inlet, hot air enters a central pipe and a peripheral heat exchange channel through a central pipe air inlet and an outer barrel air inlet respectively, heat exchange is carried out on the pearls on the inner side and the outer side, heat is released to dry the pearls, and the dried pearls enter a preheating furnace through a pre-drying discharge pipe to be preheated. After the driving rotary mechanism is started, the driving motor and the driving gear drive the central tube to rotate, so that the stirrer turns over perlite, on one hand, perlite turns over and stirs evenly and is fully mixed to promote the pre-drying effect, and on the other hand, perlite adhesion blocking is prevented from affecting the discharging of the pre-dryer.

Drawings

FIG. 1 is a schematic view showing the overall structure of a specific example 1 of a raw material preheating apparatus for expanded perlite production of the present utility model;

FIG. 2 is an enlarged detail view at A in FIG. 1;

reference numeral 1-a preheating furnace; 2-perlite barrels; 21-a feed inlet of the preheating furnace; 22-a discharge hole of the preheating furnace; 3-preheating the cylinder; 31-preheating an air inlet; 32-a hot air outlet; 4-spiral conveying blades; 5-a conveying motor; 6-a pre-dryer; 7-an outer cylinder; 71-predrying feed inlet; 72-an air inlet of the outer cylinder; 73-an outer cylinder air outlet; 8-an inner cylinder; 81-a pre-drying discharge port; 9-a central tube; 91-a central tube air inlet; 92-a central tube air outlet; 10-center helical blade; 11-peripheral helical blades; 12-a stirrer; 13-a rotary joint; 14-driving a motor; 15-a drive gear; 16-driven gear ring.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

The utility model relates to a raw material preheating device for expanded perlite production, which comprises:

as shown in fig. 1, the raw material preheating device for expanded perlite production comprises a preheating furnace 1 and a pre-dryer 6 positioned at the front end of the preheating furnace 1, wherein the preheating furnace 1 comprises a perlite cylinder 2 positioned at the inner side and a preheating cylinder 3 positioned at the outer side of the perlite cylinder 2, an insulating layer is arranged at the outer side of the preheating cylinder 3, a preheating furnace feed inlet 21 and a preheating furnace discharge outlet 22 are respectively arranged at two ends of the perlite cylinder 2, and a discharge pipe extending out of the preheating cylinder is arranged at the outer side of the preheating furnace discharge outlet 22. A preheating annulus for supplying hot air and heating perlite is formed between the perlite cylinder 2 and the preheating cylinder 3, and a preheating air inlet 31 for supplying hot air and a hot air outlet 32 for discharging hot air are respectively formed at two ends of the preheating cylinder 3. The perlite cylinder 2 is internally provided with a spiral conveying blade 4 for conveying perlite to move, and the preheating furnace 1 is externally provided with a conveying motor 5 for driving the spiral conveying blade 4 to rotate. When in use, hot air is supplied into the preheating ring from an external hot air source, exchanges heat with perlite in the perlite cylinder 2 for preheating, and the hot air after heat exchange flows from the hot air outlet 32 to the pre-dryer 6.

The pre-dryer 6 uses hot air heat to pre-dry perlite at the front end of the preheating furnace 1, as shown in fig. 2, the pre-dryer 6 comprises an outer cylinder 7, an inner cylinder 8 and a central tube 9 which are coaxially arranged from outside to inside, the upper end and the lower end of the outer cylinder 7 are all closed, the upper end of the inner cylinder 8 is fixedly connected with the upper end of the outer cylinder 7, a peripheral heat exchange channel is arranged between the outer cylinder 7 and the inner cylinder 8, an outer cylinder air inlet 72 and an outer cylinder air outlet 73 are respectively arranged at the upper end and the lower end of the outer cylinder 7, the outer cylinder air inlet 72 and the outer cylinder air outlet 73 are both communicated with the peripheral heat exchange channel, and the outer cylinder air inlet 72 is communicated with the hot air outlet 32 of the preheating furnace. The upper end of the outer cylinder 7 is also provided with a pre-drying feed inlet 71 corresponding to the position of the inner cylinder 8 and used for feeding materials into the inner cylinder 8, the lower end of the inner cylinder 8 is provided with a pre-drying discharge outlet 81 and extends out of the outer cylinder through a pre-drying discharge pipe to be connected with the feed inlet 21 of the preheating furnace, and perlite enters the preheating furnace 1 through the pre-drying discharge pipe for preheating after being pre-dried.

The upper end of the central tube 9 extends out of the outer cylinder 7, the lower end extends out of the inner cylinder 8, the upper end and the lower end of the central tube 9 are respectively connected with the lower end of the inner cylinder 8 and the upper end of the outer cylinder 7 in a rotating way through bearings, a central tube air inlet 91 and a central tube air outlet 92 are respectively arranged at the upper end and the lower end of the central tube 9, a rotary joint 13 is arranged at the upper end of the central tube 9 and is communicated with a hot air outlet 32 of a preheating furnace through the rotary joint 13, peripheral helical blades 11 are arranged in the inner wall 7 of the outer cylinder, and central helical blades 10 are fixed in the central tube 9, so that helical and meandering helical air channels are formed between the outer cylinder and the inner cylinder and in the central tube, and the retention time and the passing path of hot air are prolonged, so that the hot air exchanges heat with perlite fully.

The utility model also comprises a driving mechanism for driving the central tube 9 to rotate, the driving mechanism is arranged outside the outer cylinder 7 and comprises a driving motor 14 and a driving gear 15 positioned at the output end of the driving motor 14, a driven gear ring 16 meshed with the driving gear 15 is arranged outside the upper end of the central tube 9, after the driving motor 14 is started, the driving gear 15 drives the central tube 9 to rotate, a stirrer 12 for stirring perlite is also arranged outside the central tube 9, and the stirrer can uniformly mix perlite when rotating, so that each part is heated uniformly, the drying efficiency is improved, and the influence of blockage caused by perlite adhesion on discharging can be prevented.

According to the pre-dryer adopted by the utility model, the outer side and the inner side of the perlite are subjected to heat exchange synchronously through the central pipe and the peripheral heat exchange channels, so that the heat exchange contact area is increased, the condition that only outer perlite is heated is avoided, hot air passes through the central pipe and the peripheral heat exchange channels in a spiral path, the residence time is long, the perlite exchanges heat more fully, the residual heat of the hot air can be fully utilized, and the heat utilization efficiency is improved, so that the problems of high heat waste and low energy utilization rate in the existing expanded perlite preheating process can be solved.

The above is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (3)

1. The raw material preheating device for producing the expanded perlite comprises a preheating furnace and a pre-dryer arranged at the front end of the preheating furnace and used for feeding the preheating furnace, and is characterized in that the pre-dryer comprises an outer cylinder, an inner cylinder and a central tube which are coaxially arranged from outside to inside, the upper end and the lower end of the outer cylinder are closed, the inner cylinder is fixed inside the outer cylinder, a peripheral heat exchange channel is arranged between the inner cylinder and the outer cylinder, a pre-drying feed inlet for the perlite to enter the inner cylinder and an outer cylinder air inlet communicated with a hot air outlet of the preheating furnace are arranged at the upper end of the outer cylinder, hot air enters the peripheral heat exchange channel through the outer cylinder air inlet, and an outer cylinder air outlet is arranged at the lower end of the outer cylinder; the lower end of the inner cylinder is provided with a pre-drying discharge hole and extends out of the outer cylinder through a pre-drying discharge pipe to be connected with a feed inlet of the preheating furnace, the upper end of the central pipe extends out of the upper end of the outer cylinder and is provided with a central pipe air inlet communicated with a hot air outlet of the preheating furnace, the lower end of the central pipe extends out of the lower end of the inner cylinder and is provided with a central pipe air outlet, a central spiral blade is fixed in the central pipe, and a peripheral spiral blade positioned in a peripheral heat exchange channel is fixed on the inner wall of the outer cylinder.

2. The raw material preheating device for expanded perlite production according to claim 1, further comprising a driving rotation mechanism, wherein the upper end and the lower end of the central tube are respectively connected with the outer tube and the inner tube in a rotating way through bearings, the driving rotation mechanism is positioned outside the outer tube and comprises a driving motor and a driving gear, the driving gear is arranged at the output end of the driving motor, a driven gear ring which is meshed with the driving gear for transmission is arranged at the outer side of the upper end of the central tube, a stirrer for stirring perlite is arranged at the outer wall of the central tube, and a rotary joint is arranged at the upper end of the central tube.

3. The raw material preheating device for expanded perlite production according to claim 1, wherein the preheating furnace comprises a perlite cylinder and a preheating cylinder positioned at the outer side of the perlite cylinder, a preheating annulus is arranged between the preheating cylinder and the perlite cylinder, a preheating air inlet and a hot air outlet are respectively arranged at two ends of the preheating cylinder, a preheating furnace feed inlet is positioned on the perlite cylinder, a preheating furnace discharge outlet is arranged on the perlite cylinder, a discharge pipe extending out of the preheating cylinder is arranged at the outer side of the preheating furnace discharge outlet, a spiral conveying blade is arranged inside the perlite cylinder, a conveying motor for driving the spiral conveying blade to rotate is arranged outside the preheating furnace, and a heat preservation layer is arranged outside the preheating cylinder.