SU1176163A1 - Overflow device for multizone fluidized bed furnace - Google Patents

Abstract

1. A SHIPPING DEVICE FOR A MULTI-ZONE BOOTH LAYER HEATER, containing a pipe for material supply with a nozzle at the outlet installed outside the furnace body and a rotary flat valve behind the nozzle,. characterized in that, in order to increase its performance by eliminating the conditions for the formation of the ards in the nozzle and the sintering of bulk material in the overflow device, the flat valve is equipped with wedges with pointed upper edges installed on its upper surface, and the nozzle is made with a working bevel end, while the flat valve is installed obliquely at an angle of bevel end of the nozzle. 2. The device pop, 1, differs from the fact that the working end of the nozzle is angled 25-55. 3. The device according to claim 1, which means that the dividers (L are set at an angle to each other with upper pointed edges diametrically opposite in different directions.

Description

but

 The invention relates to engineering. drying and roasting of bulk materials, in particular, to the overflow devices of multi-zone KS furnaces, and can be used in apparatuses for drying and roasting materials in a suspended state. The purpose of the invention is to increase the device performance by eliminating the conditions for the formation of bundles in the nozzle and the sintering of bulk material in the overflow device. Figure 1 shows the device, a general view; FIG. 2 is a view A of FIG. figure 3 - valve in axonometry. The overflow device for a multi-bed fluidized bed furnace contains an inlet pipe 1, a nozzle 2, a valve 3, a valve box 4, a pipe. The outlet pipe 1 is made of ordinary steel and the upper part is rigidly fixed to the casing of the gas distribution valve 6 Bbmie 7, supporting the upper fluidized bed of the material being processed. The inlet pipe 1 has a bend and ends at the bottom with a flange to which the nozzle 2 and valve box 4 are attached. The nozzle 2 is made of welded or cast steel sheet steel. The lower part of the nozzle is angled 25-55. The lower part of the nozzle angled 25-55 ° serves as a saddle of the rotary flat valve 3 with the lever 8. The flat valve 3 is made in the form of a disk from steel and on the working surface adjacent to the nozzle contains dividers 9 with a sharp edge. The dividers 9 can be made of sheet steel and attached (for example, by welding) to the flat valve 3 or cast together with it. The sharp edges of the dividers 9 are directed towards the material discharged from the nozzle. The flat valve 3 with the splitters 9 is fixed on the turn of the nominal 8 with the axle. The pivot lever 8 of the valve 3 is made curved with an inclination downward at the end of the valve disc on the side of the pivot arm 8 lever. Thus, the lever 8 with the valve disc 3 is inclined with respect to the horizontal section. a lever at a bevel angle of the lower part of the nozzle 2, equal to 25-55®: the valve is rotated due to the lever axis. a 8 fixed in the tides 10 (or cheeks) on the valve box 4. The valve box 4 with the tides 10 (cheeks) is made of pipes and sheet steel by welding or cast. The outlet pipe 5 is connected to the lower part of the valve box, 4. The inclination of the valve 3 with respect to the horizontal section of the lever 8 in the closed state contributes to a tight fit of the valve disc to the contact surface of the bevel of the nozzle 2 due to lapping at the time of closing. Experience has shown that the angle of inclination of the valve (the bevel angle of the lower part of the nozzle 2) is directly proportional to the angle of repose of the bulk material being transferred. The magnitude of the bevel angle and inclination of the valve disc 3 is set on the laboratory model to determine the design parameters of the overflow device, based on the condition of increasing productivity by achieving reliability when starting the overflow device into operation and stability in the operation of the fluidized bed furnace under conditions of gas backflow and material. Making the nozzle 2 bevel angle less than 25 creates more favorable conditions for the formation of 2 caps in the nozzle and material sticking, especially in extreme conditions, when the flow velocity of the countercurrent gas reaches the first critical (c) pulsating pressure. Increasing the bevel angle more than 55 is impractical due to excessive reduction. the magnitude of the counter pressure of the dense layer of the countercurrent gas flow, which is directly proportional to the height of the dense layer, namely 4p fry, where 4p is the magnitude of the counterpressure of the dense material column in the overflow device; B height of dense layer; y is the density of the bulk material; - porosity of a dense moving layer. The device works as follows. The material from the upper zone of the fluidized bed passes through the inlet pipe 1 of the overflow device to the nozzle 2, covered with a valve 3, driven by a rotating lever through the actuator of the automatic system for adjusting the height of the fluidized bed. When the valve is opened at a certain angle, the dividers 9 loosen the tight

3I

a layer of granular material in the nozzle 2 and granular material flows from the nozzle 2, through the valve box 4 and the outlet pipe 5 enters the fluidized bed of the lower zone. The presence of sharp edges on the dissector 9 reduces the resistance to the material being exhausted. Due to the fact that the upper grille and fluidized bed create aerodynamic resistance to the upward flow of gases, gases from the lower zone of the fluidized bed rush through the scraper from bottom to top and slow down the movement of bulk material from top to bottom. In addition (due to pressure fluctuations of the gas flow in the operating mode, conditions arise for the formation of the arbors in the nozzle, the material freezes and stops its transfer from zone to zone. When the furnace goes to idle or when the furnace stops hot, the transfer of the mother stops

ala by closing the valve of the transfer device. However, due to the presence of backlash in the articulated horizontally mounted valve and actuator, leaks occur on the valve plate against the lower edge of the nozzle. This leads to the filtration of the dusty stream through a dense layer of bulk material in the nozzle and inlet pipe and sintering of the material. The presence of the splitters on the flat valve plate and the tight fit of the valve plate to the lower edge of the nozzle due to its skewness and valve installation at an angle of 25-55 provides an increase in flowability, the maximum flow rate of the material from the nozzle in the folded aerodynamic conditions work The effect of combining these two factors increases

transfer device performance.

FIG. 2

Fa.H.

Claims (3)

I. TRANSMISSION DEVICE FOR A MULTI-ZONE FURNACE LAYER FURNACE, containing a pipe for supplying material with an outlet nozzle installed outside the furnace body and a rotary flat valve located behind the nozzle,. characterized in that, in order to increase its productivity by eliminating the conditions for the formation of vaults in the nozzle and sintering of bulk material in the transfer device, the flat valve is equipped with wedges with pointed upper edges mounted on its upper surface, and the nozzle is made with a bevel of the working end while the flat valve is installed obliquely at an angle of inclination of the nozzle end face. 2. Device pop. 1, characterized in that the working end of the nozzle is beveled at an angle of 25-55 °. 3. The device according to claim 1, with the proviso that the dividers b are mounted at an angle to each other IV with their upper pointed edges diametrically opposite to each other. S> 1176163 2