Exhaust dust collector for biomass fuel hot air stove

Abstract

The exhaust dust collector of the biomass fuel hot blast furnace of the present invention comprises an air intake bend, an exhaust fan, a connecting bend, an ash discharge pipe, a buffer tank and a cyclone dust collector; the air intake bend and the connecting bend are both 90° bends with smooth transition and are both provided with a top pipe opening and a lower side pipe opening; the bottom air inlet of the exhaust fan is connected with the top pipe opening of the air intake bend, and the side air outlet of the exhaust fan is connected with the lower side pipe opening of the connecting bend; the top end of the ash discharge pipe is connected with the upper end side of the connecting bend and an ash discharge cover is provided at the bottom; the buffer tank is invertedly connected to the top pipe opening of the connecting bend, the inner wall of the buffer tank is provided with a screen lining, and the lower side of the buffer tank is provided with a side outlet connected to the air intake pipe of the cyclone dust collector; the top of the cyclone dust collector is provided with an exhaust pipe and the bottom is provided with an ash dropping pipe, and the air intake pipe is provided at the upper side of the cyclone dust collector.

Description

Technical Field

[0001] The invention relates to a tail gas dust collector of a biomass fuel hot blast furnace. Background Art

[0002] The biomass fuel hot air furnace mainly uses biomass such as rice husks, straw or sawdust as fuel. It is a new type of indirect hot air furnace that can be used to bake tea, bamboo shoots, tobacco leaves, bacon, etc. The combustion process of biomass fuel will produce some ash. A dust collector is connected to the tail of the hot air furnace for exhaust gas dust removal. The dust collector is a cyclone dust collector. The exhaust gas is accelerated into the cyclone dust collector by an exhaust fan. The ash in the exhaust gas is discharged from the bottom of the dust collector, and the exhaust gas separated from the ash is discharged from the top of the dust collector. However, the ash in the exhaust gas is lighter and finer, and the exhaust gas passing through the cyclone dust collector still contains a lot of ash, and the dust removal is not thorough enough. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a tail gas dust collector for a biomass fuel hot air furnace with more thorough dust removal.

[0004] In order to solve the above technical problems, the exhaust dust collector of the biomass fuel hot blast furnace of the present invention includes an air intake bend, an exhaust fan, a connecting bend, an ash discharge pipe, a buffer tank and a cyclone dust collector; the air intake bend and the connecting bend are both 90° bends with smooth transition and are both provided with a top pipe opening and a lower side pipe opening; the bottom air inlet of the exhaust fan is connected with the top pipe opening of the air intake bend, and the side air outlet of the exhaust fan is connected with the lower side pipe opening of the connecting bend; the top of the ash discharge pipe is connected with the upper end side of the connecting bend and an ash discharge cover is provided at the bottom; the buffer tank is invertedly connected to the top pipe opening of the connecting bend, the inner wall of the buffer tank is provided with a screen lining, and the lower side of the buffer tank is provided with a side outlet connected to the air intake pipe of the cyclone dust collector; the cyclone dust collector is provided with an exhaust pipe at the top and an ash dropping pipe at the bottom, and the air intake pipe is provided at the upper side of the cyclone dust collector.

[0005] An air duct is vertically arranged in the buffer tank, the bottom end of the air duct is sealed and connected to the bottom tank opening of the buffer tank, the top end of the air duct faces the top wall of the buffer tank, and the connecting elbow is connected to the buffer tank through the air duct.

[0006] The top wall of the buffer tank is connected with a conical ceiling, and the bottom cone tip of the conical ceiling faces the top pipe opening of the air duct.

[0007] The screen lining of the inner wall of the buffer tank is provided with multiple layers of screens.

[0008] A wind screen is arranged in the communicating port between the top end of the ash discharge pipe and the connecting elbow pipe.

[0009] By adopting the structure of the present invention, a buffer tank is connected between the exhaust fan and the cyclone dust collector, and a screen lining is provided in the buffer tank, so that the ash and water vapor in the exhaust gas can be buffered and gathered, and the particle size of the ash can be increased. Ashes with larger particle sizes fall into the cyclone dust collector and can be separated more effectively, thereby making the dust removal more thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] In the figure: 1-air intake elbow, 2-exhaust fan, 3-buffer tank, 4-draft duct, 5-wind screen, 6-connecting elbow, 7-ash discharge pipe, 8-exhaust pipe, 9-air intake pipe, 10-dust removal chamber, 11-ash discharge pipe. DETAILED DESCRIPTION

[0012] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] like Figure 1 As shown, the tail gas dust collector of the biomass fuel hot blast furnace of the present invention includes an air intake elbow, an exhaust fan, a connecting elbow, an ash discharge pipe, a buffer tank and a cyclone dust collector.

[0014] The air intake elbow and the connecting elbow are both 90° elbows with smooth transition and are both provided with a top pipe opening and a lower side pipe opening. The direction of the top pipe opening is perpendicular to the direction of the lower side pipe opening. The air intake elbow and the connecting elbow are both used to guide the air flow to change the flow direction and facilitate the connection between various components. The bottom pipe opening of the air intake elbow is used to connect the exhaust outlet of the hot air furnace.

[0015] The bottom air inlet of the exhaust fan is connected to the top pipe opening of the air inlet elbow, and the side air outlet of the exhaust fan is connected to the lower side pipe opening of the connecting elbow. The exhaust fan is a centrifugal fan, and the bottom air inlet of the exhaust fan is set at the bottom center of the exhaust fan. The exhaust fan is used to draw out the exhaust gas from the hot air furnace and blow it out faster.

[0016] The top of the ash discharge pipe is connected to the upper side of the connecting elbow and an ash discharge cover is provided at the bottom. The ash discharge pipe is used to collect and discharge the ash in the connecting elbow. The ash discharge pipe is connected to the upper side of the connecting elbow, and the length direction of the ash discharge pipe is more consistent with the airflow direction at the upper end of the connecting elbow, which can reduce the ash in the ash discharge pipe being sucked away by the airflow. The ash in the ash discharge pipe can be discharged by opening the ash discharge cover regularly.

[0017] The buffer tank is connected upside down to the top pipe opening of the connecting elbow. The inner wall of the buffer tank is provided with a screen lining. The lower side of the buffer tank is provided with a side outlet connected to the air inlet pipe of the cyclone dust collector. The screen lining in the buffer tank can absorb ash, water vapor and oil smoke in the exhaust gas, causing the ash to gather, increase the particle size, and finally fall automatically, and finally be discharged from the side outlet and enter the cyclone dust collector.

[0018] The cyclone dust collector is provided with an exhaust pipe at the top and an ash-falling pipe at the bottom, and the air inlet pipe is provided at the upper side of the cyclone dust collector. The dust removal chamber in the middle of the cyclone includes a cylindrical portion at the top and a conical portion in the middle. The air inlet pipe is tangentially connected to the inner wall of the top of the cylindrical portion of the dust removal chamber. The top of the exhaust pipe is a curved pipe facing the side, and the bottom end of the exhaust pipe extends into the center of the bottom end of the cylindrical portion of the dust removal chamber. The ash-falling pipe is connected to the bottom end of the conical portion of the dust removal chamber, and a bottom cover is provided at the bottom end of the ash-falling pipe. The tail gas is blown downward in a spiral in the dust removal chamber, and the gas in the tail gas is discharged from the exhaust pipe, while the ash in the tail gas falls into the ash-falling pipe due to gravity. Sealing the bottom end of the ash-falling pipe with a bottom cover can reduce the exhaust gas from being discharged from the ash-falling pipe, and the ash is accumulated in the ash-falling pipe and discharged regularly. Since the ash increases in particle size in the buffer tank, the dust removal in the cyclone dust collector is more thorough.

[0019] like Figure 1 As shown, an air duct is vertically arranged in the buffer tank, the bottom end of the air duct is sealed and connected to the bottom tank opening of the buffer tank, the top end of the air duct faces the top wall of the buffer tank, and the connecting elbow is connected to the buffer tank through the air duct. The outer diameter of the air duct is one-third to two-thirds of the bottom tank opening of the buffer tank. The air duct guides the airflow of the connecting elbow to the tank top and blows it into the screen lining to prevent the exhaust gas from being discharged directly from the side outlet of the buffer tank, thereby improving the adsorption and aggregation effect of the screen lining in the buffer tank on ash.

[0020] like Figure 1 As shown, the top wall of the buffer tank is connected to a conical ceiling, and the bottom cone tip of the conical ceiling is facing the top pipe opening of the induced draft duct. The conical ceiling is set inside the screen lining, and the surface of the conical ceiling is covered by the screen lining. The conical ceiling can not only increase the contact area of ​​the top wall of the buffer tank and absorb more ash, but also guide the flow of exhaust gas to the surroundings, so that the exhaust gas is blown more toward the screen lining at the side wall of the buffer tank, thereby improving the utilization rate of the screen lining and the absorption rate of ash.

[0021] like Figure 1 As shown, the screen lining of the inner wall of the buffer tank is provided with multiple layers of screens, which more fully absorbs the ash in the exhaust gas, provides a greater buffer for the ash, and increases the aggregation of the ash in the buffer.

[0022] like Figure 1 As shown, a windshield screen is provided in the connecting port between the top of the ash discharge pipe and the connecting elbow. The windshield screen can reduce the airflow blowing into the ash discharge pipe, reduce the ashes in the ash discharge pipe from being blown away, and the ashes can fall into the ash discharge pipe through the screen holes of the windshield screen, thereby improving the collection effect of the ash discharge pipe on the ashes in the connecting elbow.

Claims

1. A tail gas dust collector for a biomass fuel hot blast furnace, characterized in that: It includes air intake elbow, exhaust fan, connecting elbow, ash discharge pipe, buffer tank and cyclone dust collector; The air intake elbow and the connecting elbow are both 90° elbows with smooth transition and are both provided with a top pipe opening and a lower side pipe opening; The bottom air inlet of the exhaust fan is connected to the top pipe opening of the air inlet elbow, and the side air outlet of the exhaust fan is connected to the lower side pipe opening of the connecting elbow; The top end of the ash discharge pipe is connected to the upper end side of the connecting elbow and the bottom end is provided with an ash discharge cover; The buffer tank is invertedly connected to the top pipe opening of the connecting elbow, the inner wall of the buffer tank is provided with a screen lining, and the lower side of the buffer tank is provided with a side outlet connected to the air inlet pipe of the cyclone dust collector; The cyclone dust collector is provided with an exhaust pipe at the top and a dust dropping pipe at the bottom, and the air inlet pipe is provided at the upper side of the cyclone dust collector; An air duct is vertically arranged in the buffer tank, the bottom end of the air duct is sealed and connected to the bottom tank opening of the buffer tank, the top end of the air duct faces the top wall of the buffer tank, and the connecting elbow is connected to the buffer tank through the air duct; The top wall of the buffer tank is connected to a conical ceiling, and the bottom tip of the conical ceiling faces the top end of the air duct. The screen lining of the inner wall of the buffer tank is provided with multiple layers of screens; A wind screen is arranged in the communicating port between the top end of the ash discharge pipe and the connecting elbow pipe.

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