CN105757678A - Small biomass direct burning type hot-blast stove - Google Patents

Abstract

The invention relates to a small biomass direct-fired hot blast stove, which comprises a storage bin, a combustion chamber, a smoke transfer chamber and a heat exchanger. Biomass fuels such as rice straw and stalks are cut into pieces and crushed, and then preheated by flue gas in the storage bin, and then blown into the furnace by an automatic blower for combustion. The generated flue gas enters the flue gas transfer chamber through the outlet of the furnace, and after multi-return dust removal, the ash is deposited and removed from the ash falling port, and the flue gas enters the heat exchanger after ash removal. The flue gas enters the smoke pipe to exchange heat with the air outside the pipe and then is discharged, and enters the storage bin through the external smoke transfer pipe to heat the new biomass fuel, and is discharged from the outlet. The air enters the spiral air channel from the upper inlet of the combustion chamber, conducts preliminary heat exchange with the furnace, enters the heat exchanger through the air connection pipe of the smoke transfer chamber, exchanges heat with the flue gas in the smoke pipe in the heat exchanger, and passes through the air outlet discharge. The unique furnace structure, multi-return heat exchanger structure and tail gas preheating fuel can effectively reduce the exhaust gas temperature and improve the efficiency of the hot blast stove.

Description

A small biomass direct-fired hot blast stove

technical field

The invention relates to a small biomass direct-fired hot blast stove.

Background technique

At present, all kinds of biomass hot stoves burn biomass fuel rods, which need to be purchased and cannot directly use raw materials. There is a large amount of biomass straw in rural areas, and raw materials such as rice straw cannot be effectively utilized.

Greenhouse planting, drying of grain, seeds, agricultural by-products, and special aquaculture all require hot air supply. However, the above-mentioned various industries are located in rural areas and are relatively scattered, so they cannot effectively provide centralized supply.

This proposal is a small biomass direct-fired hot blast stove, which can effectively use crop raw materials, efficiently provide hot air for production and life, and solve the demand for heat sources.

Contents of the invention

The invention relates to a small biomass direct-fired hot blast stove.

The present invention is achieved like this:

Biomass fuels such as straw and stalks are initially cut into pieces and crushed, stored in the storage bin and preheated by flue gas. It falls from the outlet of the storage bin into the discharge opening of the combustion chamber, and is blown into the furnace of the combustion chamber by an automatic blower, and is fully burned on the fixed grate in the furnace. After combustion, the ash falls into the ash pit, and the generated flue gas enters the smoke transfer chamber through the furnace flue gas outlet after preliminary heat exchange with the air in the spiral channel outside the furnace wall.

There are multiple smoke chamber smoke baffles in the smoke turning chamber to divide into multi-circuit flue gas channels. After the flue gas has been turned to natural dust removal for many times in the channel, the ash is deposited by the ash discharge port and discharged by the ash removal door.

After the dust is removed, the flue gas enters the heat exchanger from the outlet of the smoke transfer chamber.

After the flue gas in the heat exchanger enters the smoke pipe and performs multi-return heat exchange with the air outside the pipe, it leaves the heat exchanger, enters the storage bin through the external smoke transfer pipe, and preheats the new biomass fuel in the bin. Exit discharge.

The air enters the spiral air channel of the combustion chamber from the upper inlet of the combustion chamber, conducts a preliminary heat exchange with the flue gas on the other side of the furnace wall, and enters the heat exchanger through the air connection pipe in the smoke transfer chamber, and in the heat exchanger and the flue gas in the flue pipe. The flue gas undergoes multi-return heat exchange and is discharged through the air outlet.

Beneficial effect:

The invention relates to a small biomass direct-fired hot air stove, which can efficiently utilize biomass raw materials such as surplus straw in rural areas, and provide heat sources for greenhouse planting, drying of grain and seeds, agricultural and sideline products, and special breeding industries. It can effectively reduce the heat loss in the furnace of the hot blast stove, improve the fuel utilization rate, reduce the loss of exhaust smoke, and reduce the emission of pollutants.

Description of drawings:

Accompanying drawing 1 is a kind of isometric view of small-scale biomass direct-fired hot blast stove.

Accompanying drawing 2 is combustion chamber spiral air channel and air flow direction diagram.

Accompanying drawing 3 is a sectional view of the combustion chamber.

Accompanying drawing 4 is the cross-sectional view of the smoke transfer chamber.

Accompanying drawing 5 is a sectional view of the front heat exchanger.

Accompanying drawing 6 is a sectional view of the rear heat exchanger

Among them: storage bin (1), combustion chamber (2), smoke transfer chamber (3), heat exchanger (4), smoke transfer pipe (5), air inlet (6), air outlet (7), flue gas total Exit (8), combustion chamber air passage (21), combustion chamber ash pit (22), fixed grate (23), feeding device (24), furnace (25), smoke baffle plate (31), Ash outlet (32), ash removal door (33), flue gas outlet of the smoke transfer chamber (34), air connecting pipe (35), heat exchanger smoke baffle (41), smoke pipe (42), heat exchanger Air outlet (43), heat exchanger flue gas inlet (44), heat exchanger flue gas outlet (45),

Air circulation path (a), flue gas circulation path (b).

detailed description:

Example 1:

A small biomass direct-fired hot blast stove, which includes a storage bin (1) and a hot blast stove body, characterized in that the hot blast stove body consists of a combustion chamber (2), a smoke transfer chamber (3), a heat exchanger (4 ) composition; the heat exchanger (4) is connected to the storage bin (1) through the smoke transfer pipe (5); the air inlet (6) is located in the combustion chamber, the air outlet (7) is located in the heat exchanger (4), and the flue gas The main outlet (8) is located on the storage bin (1).

Example 2:

The combustion chamber according to Embodiment 1 is composed of a furnace (25) and a spiral air channel (21) surrounding it; the furnace is composed of an ash pit (22), a fixed fire grate (23), and an automatic blower (24) ; The furnace flue gas outlet (26) is located above the furnace.

Example 3:

According to Embodiment 1, the smoke transfer chamber is divided into multi-circuit flue gas passages by a plurality of smoke transfer chamber smoke baffles (31). The ash door (33) and the flue gas outlet (34) of the smoke transfer chamber are located at the lower part of the smoke transfer chamber; the lower part of the combustion chamber is provided with an air connection pipe (35).

Example 4:

According to Embodiment 1, the heat exchanger is divided into multi-circuit air passages by multiple heat exchanger smoke baffles (41), and the smoke pipes (42) form the flue gas passage; the heat exchanger flue gas inlet (44) is located at the heat exchange Below the heat exchanger, the flue gas outlet (45) of the heat exchanger is located above, and the air outlet (43) of the heat exchanger is located at the end of the upper air channel.

Claims (4)

1. a small-sized biomass direct combustion hotblast stove, it includes storage bin (1) and air stove body, it is characterized in that: air stove body by combustor (2), turn smoke-box (3), heat exchanger (4) forms；By turning smoke pipe (5), heat exchanger (4) is connected with storage bin (1)；Air intake (6) is positioned at combustor, and air outlet slit (7) is positioned at heat exchanger (4), and flue gas general export (8) is positioned on storage bin (1).

2. the combustor according to claim 1 volute type air passage (21) by burner hearth (25) with around surrounding forms；Burner hearth is made up of ashcan (22), fixed grate (23), automatic blowing machine (24)；Burner hearth exhanst gas outlet (26) is positioned at above burner hearth.

3. turning smoke-box according to claim 1 to be turned smoke-box smoke barrier (31) by polylith and be separated into multiloop exhaust gases passes, underlying smoke barrier has ash port (32), and sidewall arranges ash door (33), turns smoke-box exhanst gas outlet (34) and is positioned at and turns smoke-box bottom；Combustor rear lower is provided with air connecting tube (35).

4. heat exchanger is divided into multiloop air duct by polylith heat exchanger smoke barrier (41) according to claim 1, smoke pipe (42) composition exhaust gases passes；Heat exchanger smoke inlet (44) is positioned at below heat exchanger, and heat exchanger exhanst gas outlet (45) is above, and heat exchanger air outlet slit (43) is positioned at upper air channel end.