CN203323182U - Internal-circulation-type segmented preheating biomass warming furnace - Google Patents

Abstract

An internal circulation type segmental preheating biomass heating furnace, including an outer shell and a furnace tank, the top of the outer shell is provided with an upper end feed port, the side wall of the outer shell is provided with an upper end feed port, and the inner shell is provided with an inner shell , the outer shell and the inner shell form a sandwich, and the furnace is located in the inner shell. The base of the lower part of the outer casing and the lower part of the inner casing form a heat storage chamber, the heat storage chamber is provided with a lower air outlet, one side of the heat storage chamber is provided with a secondary air inlet, and one side of the outer casing is provided with a primary air outlet. An air inlet, and an upper air outlet is provided on the top of the inner shell and the furnace. The utility model has the advantages of an internal circulation type segmented preheating biomass heating furnace: the extended secondary air inlet channel is preheated by itself by using the downdraft high-temperature flue gas flow, and the segmental cycle preheats to make the secondary The air outlet temperature is high. Compared with the same size, the same fuel, and the unit heat dissipation, the comprehensive thermal efficiency reaches 86.37%, and the fuel saving is about 50%.

Description

An internal circulation type segmental preheating biomass heating furnace

technical field

The utility model relates to a stove, in particular to an internal circulation type segmental preheating biomass heating stove.

Background technique

In the biomass heating furnace in the prior art, the biggest disadvantage of the secondary air intake is: the preheating of the secondary air intake is insufficient, and cold wind or low-temperature air enters the inner chamber of the furnace, which reduces the temperature of the inner chamber, resulting in chemical insufficiency at the air outlet of the inner chamber. After burning completely, there is still smoke coming out of the chimney outlet. And the temperature of the outer wall is low, so the purpose of heating cannot be reached.

The reasons are as follows:

1) Although the secondary air intake also adopts the preheating design, it is too simple. The disadvantage is that the preheating path is too short, only 10cm to 30cm. The cold air enters the preheating tube cavity and does not reach 150°C, and soon enters the inner bore combustion chamber.

2) The temperature of the air chamber itself in the preheating path is not high, so it cannot be heated to a high temperature of 300°C for the secondary air.

3) There is no segmented compound preheating. The secondary air preheating is a gradual process, from low temperature to medium temperature and then to high temperature, not high temperature instantaneously.

4) The disadvantages of the chimney of the upper-firing semi-gasification furnace are: in the upper and middle part of the stove, the suction force is too large, the flow rate is too fast, and the secondary air intake goes directly to the combustion chamber. What's more serious is: the heat generated by the secondary air outlet nozzle is discharged directly into the fume cooker, the path is too short, and the combustible gas obtained by gasification is burned to further release its chemical energy, which is not fully utilized and the loss is large.

Contents of the invention

In order to solve the above-mentioned technical problems, the utility model provides an internal circulation type segmental preheating biomass heating furnace, which changes the up-suction smoking into a down-suction smoking, and uses the down-suction high-temperature flue gas flow to the secondary air inlet pipe. Sectional warm-up. The secondary air entering the combustion chamber in the inner bore becomes high temperature, and the combustion temperature can reach above 400°C. The secondary inlet air flowing through is preheated in sections, preheated to 250~350°C, and finally reaches the upper air outlet.

The technical solution adopted by the utility model is: an internal circulation type segmental preheating biomass heating furnace, including an outer shell and a furnace, the top of the outer shell is provided with an upper end feeding port, and the side wall of the outer shell is provided with an upper end feeding port , the outer shell is provided with an inner shell, the outer shell and the inner shell form a sandwich, and the furnace is located in the inner shell. The base of the lower part of the outer casing and the lower part of the inner casing form a heat storage chamber, the heat storage chamber is provided with a lower air outlet, one side of the heat storage chamber is provided with a secondary air inlet, and one side of the outer casing is provided with a primary air outlet. An air inlet, and an upper air outlet is provided on the top of the inner shell and the furnace.

A primary air inlet channel is formed between the inner casing and the outer casing.

A secondary air inlet is formed between the furnace and the inner shell.

The bottom of the furnace and the bottom of the inner casing form a primary preheating air passage, and the position of the primary preheating air passage corresponds to the secondary air inlet.

The side wall of the furnace and the side wall of the inner shell form a secondary preheating air passage.

The outer shell and the inner shell are made of steel, and the outer shell and the inner shell form a steel plate interlayer.

The utility model has the advantages of an internal circulation type segmental preheating biomass heating furnace: the downdraft high-temperature flue gas flow is used to preheat the lengthened secondary air inlet channel by itself, and the segmental cycle preheats to make the secondary The air outlet temperature is high. Compared with the same size, the same fuel, and the unit heat dissipation, the comprehensive thermal efficiency reaches 86.37%, and the fuel saving is about 50%.

The utility model preheats the air duct for the first time and then preheats the air duct again, so that the combustion is more complete and the firepower is greater, and the combustion-supporting air after preheating reaches 250-350°C.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is a structural schematic diagram of the utility model heating furnace.

Detailed ways

As shown in Figure 1, an internal circulation type segmental preheating biomass heating furnace includes an outer casing 3 and a furnace 4, the top of the outer casing 3 is provided with an upper feed port 1, and the side wall of the outer casing 3 is provided with an upper inlet. The material port 2 and the outer shell 3 are provided with an inner shell 12 inside, the outer shell 3 and the inner shell 12 form a sandwich, and the furnace 4 is located in the inner shell 12 .

The lower base of the outer shell 3 and the lower part of the inner shell 12 form a heat storage cavity 11 , and the heat storage cavity 11 is provided with a lower air outlet 9 . A secondary air inlet 10 is provided on one side of the heat storage cavity 11 , a primary air inlet 8 is provided on one side of the outer casing 3 , and an upper air outlet 5 is provided on the top of the inner casing 12 and the furnace 4 .

A primary air inlet passage is formed between the inner casing 12 and the outer casing 3 . A secondary air inlet channel 6 is formed between the furnace 4 and the inner casing 12 .

The bottom of the furnace 4 and the bottom of the inner casing 12 form a primary preheating air duct 7 , and the position of the primary preheating air duct 7 corresponds to the secondary air inlet 10 . The side wall of the furnace 4 and the side wall of the inner casing 12 form a secondary preheating air duct 13 .

The outer casing 3 and the inner casing 12 are made of steel, and the outer casing 3 and the inner casing 12 form a steel plate interlayer.

A secondary air intake preheating method, the cold air enters the primary preheating air channel 7 from the secondary air intake port 10 for primary preheating, since the primary preheating air channel 7 has been preheated by the heat storage cavity 11, the temperature can reach above 150°C , and then to the secondary preheating air channel 13 for secondary preheating, which can be preheated to 250~350°C, forming segmental preheating, and finally reaches the upper air outlet 5.

Due to the use of downdraft smoke exhaust, the heat circulates in the heat storage cavity 11 from the furnace inner chamber to the base, and the secondary air inlet 10 is located on the side of the furnace base, so the preheating path becomes longer. The preheating air ducts 7 are connected to each other to achieve the purpose of stepwise and gradual medium temperature preheating. The hot air rises to the high temperature area and is preheated again until the upper air outlet 5.

Claims (6)

1. An internal circulation type segmented preheating biomass heating furnace, including an outer shell (3), a furnace (4), the top of the outer shell (3) is provided with an upper feed port (1), and the outer shell (3) The side wall is provided with an upper feed port (2), and the feature is that an inner shell (12) is provided inside the outer shell (3), and the outer shell (3) and the inner shell (12) form a sandwich, and the furnace (4) Located in the inner casing (12); The lower base of the outer shell (3) and the lower part of the inner shell (12) form a heat storage cavity (11), the heat storage cavity (11) is provided with a lower air outlet (9), and the heat storage cavity (11) There is a secondary air inlet (10) on one side, a primary air inlet (8) on one side of the outer shell (3), and an upper air outlet on the top of the inner shell (12) and the furnace (4) (5). 2. The internal circulation type segmental preheating biomass heating furnace according to claim 1, characterized in that, a primary air inlet channel is formed between the inner casing (12) and the outer casing (3). 3. An internal circulation type segmental preheating biomass heating furnace according to claim 1, characterized in that, a secondary air inlet duct (6 ). 4. An internal circulation type segmental preheating biomass heating furnace according to claim 1, characterized in that the bottom of the furnace (4) and the bottom of the inner casing (12) form a primary preheating air duct (7 ), the position of the primary preheating air duct (7) corresponds to the secondary air inlet (10). 5. An internal circulation type segmental preheating biomass heating furnace according to claim 1, characterized in that, the side wall of the furnace (4) and the side wall of the inner casing (12) form a secondary preheating air Road (13). 6. An internal circulation type segmental preheating biomass heating furnace according to claim 1, characterized in that, the outer shell (3) and the inner shell (12) are made of steel, and the outer shell (3), The inner casing (12) constitutes a steel plate interlayer.

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