Novel powder circulating gas generator

Abstract

The utility model relates to a novel powder circulating gas generator. The defects that an existing gas generator is prone to dust accumulation, inconvenient to maintain and long in maintenance time are overcome. The novel powder circulating gas generator comprises a preheating combustion chamber, a cyclone gas-solid separator and a material returning device, an opening is formed in the outer side wall of the lower portion of the material returning device, a drawer type movable air bellow is inserted into the opening, a main body of the drawer type movable air bellow is a flat box body, an air door is connected outside the flat box body, a partition plate is arranged in the flat box body, and the partition plate is connected with the cyclone gas-solid separator. The longitudinal vertical section of the partition plate is in an L shape, the partition plate divides the flat box body into a loosening air chamber and a material returning air chamber, the top of the loosening air chamber and the top of the material returning air chamber are respectively provided with an air cap, the air door is provided with air pipe connectors which are respectively communicated with the loosening air chamber and the material returning air chamber, and the air pipe connectors are respectively connected with a matched compressed air pipe through hoses. The utility model is not easy to accumulate dust, convenient to overhaul, short in time and suitable for various industrial and domestic boilers such as power plant boilers, central heating boilers and the like.

Description

Technical Field

[0001] The utility model relates to a novel powder circulating gas generator. Background Art

[0002] The circulating fluidized bed type gas generator of a pulverized coal boiler has the advantages of a wide fuel adaptability range, less nitrogen oxide generation, high combustion efficiency, a large load regulation ratio, etc., and this technology has been industrially applied in the field of pulverized coal boilers.

[0003] The return feeder is an important component structure of the circulating fluidized bed type gas generator of a pulverized coal boiler. In the prior art (such as CN111102553A), the return air is usually provided by a return air blower, with high power consumption and low air pressure; the volume of the return feeder is small, and personnel cannot enter the interior of the return feeder to check the damage of the air caps; there are many openings on the outer shell of the return feeder, including a return air damper and a loosening air damper; the return air and the loosening air are respectively provided through a return air duct and a loosening air duct, and the air caps are directly welded to the air ducts. Secondly, there are many air ducts and air caps, and they need to receive air in sequence according to the distance from the air inlet. The above structure causes vortices at the root of the fluidization air duct, and the air pressure obtained by the air ducts and air caps at a long distance is small, resulting in poor and uneven fluidization in the air chamber. The main manifestations are ash accumulation and ash caking at the air duct under the air cap, burying the air duct; poor fluidization in the air chamber, affecting the return flow, and easy chronic coking at the air chamber and the air damper during operation, resulting in a return flow fluctuation phenomenon, and finally leading to the interruption of the return flow, seriously endangering the safe operation of the boiler and environmental protection and emission reduction. Finally, each return feeder has a return air damper and a loosening air damper on its outer shell, resulting in increased heat loss, an overly complex compressed air pipeline, and a large amount of work for shutdown maintenance. During maintenance, the boiler needs to be shut down and wait for the boiler to cool down completely before maintenance, and the maintenance time is long. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the above defects of the prior art and provide a novel powder circulating gas generator that is not easy to accumulate ash, convenient for maintenance, and short in maintenance time.

[0005] To solve the above technical problems, the present novel powder circulating gas generator includes a preheating combustion chamber, a cyclone gas-solid separator, and a return feeder, which are connected in series in sequence. The preheating combustion chamber is cylindrical, and a side pipe is provided at its top and communicates with the inlet of the cyclone gas-solid separator through this side pipe. The gas outlet at the top of the cyclone gas-solid separator leads to the bottom of the furnace of the matching boiler. The bottom of the cyclone gas-solid separator communicates with the lower part of the preheating combustion chamber through the return feeder. It is characterized in that: an opening is provided on the outer side wall of the lower part of the return feeder, and a drawer-type movable air box is inserted into the opening. The main body of the drawer-type movable air box is a flat box body. A damper is connected to the outside of the flat box body. A partition is provided inside the flat box body. The longitudinal vertical section of the partition is in an L shape. The partition divides the flat box body into a loosening air chamber and a return air chamber. The loosening air chamber is located on the upper outer side of the return air chamber. Air caps are respectively provided at the top of the loosening air chamber and the top of the return air chamber. And air pipe interfaces communicating with the loosening air chamber and the return air chamber respectively are provided on the damper. The above air pipe interfaces are respectively connected to the matching compressed air pipe through hoses. The damper is fixed to the outer side wall of the return feeder by screws or bolts.

[0006] With such a design, there is no pipeline between each air cap, and it is not easy to accumulate ash and cake. Even if ash accumulation and caking occur, after the furnace is stopped and the temperature is slightly reduced, the screws or bolts between the damper and the outer side wall of the return feeder are removed, and the drawer-type movable air box can be pulled out of the present novel powder circulating gas generator as a whole, quickly cooling down, quickly removing the caked ash, and then quickly restoring it and quickly igniting and putting it into production.

[0007] As an optimization, an upright small air chamber is provided on the loosening air chamber. The bottom of the upright small air chamber communicates with the loosening air chamber. A plurality of air caps are provided on its inner side wall. Heat-insulating rock wool is provided between the upright small air chamber and the damper. With such a design, the loosening effect is good, it is not easy to coke, and the heat-insulating and heat-preserving effect is good.

[0008] The present novel powder circulating gas generator operates more smoothly, is not easy to accumulate ash, is convenient for maintenance, and takes a short time. After the matching boiler is overhauled, production can be quickly restored. It is suitable for various industrial and domestic boilers such as power plant boilers and central heating boilers. Description of the Drawings

[0009] The following further describes the present novel powder circulating gas generator in conjunction with the drawings:

[0010] Figure 1 is a schematic side view structure diagram of the drawer-type movable air box in the present novel powder circulating gas generator (screws are omitted);

[0011] Figure 2 is Figure 1 a schematic top view structure diagram of the drawer-type movable air box shown (screws are omitted);

[0012] Figure 3 is Figure 1Left view structural schematic diagram of the shown air damper (screws omitted);

[0013] Figure 4 is the structural schematic diagram of the present new type of powder circulating gas generator;

[0014] Figure 5 is Figure 4 Cross-sectional structural schematic diagram of the shown material returner (cut along the vertical bisecting plane);

[0015] Figure 6 is Figure 5 Cross-sectional structural schematic diagram of the shown material returner in the drawn-out state.

[0016] In the figure: 1 is the preheating combustion chamber, 2 is the cyclone gas-solid separator, 3 is the material returner, 4 is the side pipe, 5 is the opening, 6 is the drawer-type movable air box, 7 is the air damper, 8 is the partition plate, 9 is the loosening air chamber, 10 is the material return air chamber, 11 is the air cap, 12 is the air pipe interface, 13 is the through hole for inserting screws, 14 is the vertical small air chamber, 15 is the heat-insulating rock wool, 16 is the dredging pipe. Specific embodiments

[0017] Embodiment 1: As Figures 1-6 shown, the present new type of powder circulating gas generator includes a preheating combustion chamber 1, a cyclone gas-solid separator 2 and a material returner 3, which are connected in series in sequence. The preheating combustion chamber 1 is cylindrical, and a side pipe 4 is provided at its top and is communicated with the inlet of the cyclone gas-solid separator 2 through the side pipe 4. The top gas outlet of the cyclone gas-solid separator 2 leads to the bottom of the furnace of a matching boiler (not shown in the figure). The bottom of the cyclone gas-solid separator 2 is communicated with the lower part of the preheating combustion chamber 1 through the material returner 3. It is characterized in that: an opening 5 is provided on the outer side wall of the lower part of the material returner 3, and a drawer-type movable air box 6 is inserted into the opening. The main body of the drawer-type movable air box 6 is a flat box body. A flat box body is externally connected with an air damper 7. A partition plate 8 is provided inside the flat box body. The longitudinal vertical section of the partition plate 8 is in an L shape. The partition plate 8 divides the flat box body into a loosening air chamber 9 and a material return air chamber 10. The loosening air chamber 9 is located at the outer upper side of the material return air chamber 10. Air caps 11 are respectively provided at the top of the loosening air chamber 9 and the top of the material return air chamber 10. And air pipe interfaces 12 communicated with the loosening air chamber 9 and the material return air chamber 10 respectively are provided on the air damper 7. The above-mentioned air pipe interfaces 12 are respectively connected with a matching compressed air pipe (not shown in the figure) through a hose (not shown in the figure). The air damper 7 is fixed with the outer side wall of the material returner 3 by screws or bolts.

[0018] An upright small air chamber 14 is provided on the loosening air chamber 9. The bottom of the upright small air chamber 14 is communicated with the loosening air chamber 9. A plurality of air caps 11 are provided on its inner side wall. Heat-insulating rock wool 15 is provided between the upright small air chamber 14 and the air damper 7.

[0019] A dredging pipe 16 is also provided at the bottom of the material returner 3. The dredging pipe 16 is directly opposite to the bottom of the cyclone gas-solid separator 2 above it. The drawer-type movable air box 6 is inserted into the material returner 3 from the opening, and the nozzle of the dredging pipe 16 can be blocked. When ash accumulation and caking occur, the drawer-type movable air box 6 is pulled out, and a steel bar or a bamboo pole can be inserted into the dredging pipe 16 from bottom to top to poke the ash accumulation in the cyclone gas-solid separator 2 above it.

Claims

1. A novel powder circulating gas generator, comprising a preheating combustion chamber, a cyclone gas-solid separator and a return feeder, which are connected in series in sequence. The preheating combustion chamber is cylindrical, and a side pipe is provided at its top and communicates with the inlet of the cyclone gas-solid separator through this side pipe. The top gas outlet of the cyclone gas-solid separator leads to the bottom of the furnace of the matching boiler. The bottom of the cyclone gas-solid separator communicates with the lower part of the preheating combustion chamber through the return feeder, and is characterized in that: An opening is provided on the outer side wall of the lower part of the material returner, and a drawer-type movable air box is inserted into the opening. The main body of the drawer-type movable air box is a flat box body. A damper is connected to the outside of the flat box body. A partition is provided in the flat box body, and the longitudinal vertical section of the partition is in an L shape. The partition divides the flat box body into a loosening air chamber and a material return air chamber. The loosening air chamber is located on the upper outer side of the material return air chamber. Air caps are respectively provided at the tops of the loosening air chamber and the material return air chamber. And air duct interfaces respectively communicating with the loosening air chamber and the material return air chamber are provided on the damper. The above-mentioned air duct interfaces are respectively connected to the matching compressed air pipes through hoses. The damper is fixed to the outer side wall of the material returner by screws or bolts.

2. The novel powder circulating gas generator according to claim 1, wherein: An upright small air chamber is provided on the loosening air chamber. The bottom of the upright small air chamber is connected to the loosening air chamber. A plurality of air caps are provided on its inner side wall. Heat-insulating rock wool is provided between the upright small air chamber and the damper.

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