Split type hot blast stove

Abstract

The utility model relates to tea making equipment technical field, concretely relates to a split type hot -blast furnace. Including main hot -blast furnace and split heat exchange body, the cavity for fuel combustion and flue gas operation in main heat exchange body is first cavity, the cavity for heat exchange air operation between main heat exchange body and main hot -blast furnace shell in main heat exchange body in main hot -blast furnace is second cavity, first cavity and second cavity stagger and adjacent arrangement. Be equipped with third cavity and fourth cavity in split heat exchange body, wherein, the cavity for flue gas operation is third cavity, the cavity for heat exchange air operation is fourth cavity, third cavity and fourth cavity stagger and adjacent arrangement, first cavity and third cavity are communicated, second cavity and fourth cavity are communicated, one end of the passage formed by second cavity and fourth cavity is equipped with the air -blower, the other end of the passage formed by second cavity and fourth cavity is hot -blast export, one end of the passage formed by first cavity and third cavity is equipped with the smoke -inducing machine, the other end of the passage formed by first cavity and third cavity is the combustion chamber furnace mouth. The utility model discloses through design split heat exchange body of split type, preheats the air of input main hot -blast furnace, effectively utilizes the waste heat of flue gas of main hot -blast furnace combustion discharge, is favorable to energy -conserving, emission reduction.

Description

Technical Field

[0001] This utility model relates to the field of tea-making equipment technology, specifically to a split-type hot air furnace. Background Technology

[0002] Hot air furnaces are mainly used in tea-making processes to provide high-temperature gases for processes such as fixation and drying. For example, the adjustable hot air furnace authorized by Chinese Patent No. CN110617623B on September 17, 2024, includes a furnace body, a heat exchange core, a combustion fan, and a high-pressure fan. The furnace bottom is equipped with a combustion air duct with a combustion air outlet. The furnace body has first and second air ducts, and the furnace body has third and fourth air ducts for primary and secondary heat exchange, generating low-temperature hot air and medium-temperature hot air. The heat exchange core performs quaternary heat exchange to generate high-temperature hot air. The furnace top is equipped with a fifth air duct that utilizes the waste heat of flue gas for heat exchange. At the same time, a warm air outlet and a low-temperature hot air outlet are provided, and medium-temperature hot air valves and low-temperature hot air valves with linked and opposite opening and closing states are installed respectively.

[0003] It is evident that the high-temperature flue gas generated inside the furnace is discharged after heat exchange within a relatively small volume and a correspondingly short path, resulting in low heat utilization. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is: A split-type hot blast stove is provided, which uses a split heat exchanger to recover and reuse the flue gas after several heat exchanges in the main furnace, and preheats the cold air entering the main hot blast stove that needs to be heated. To achieve the above objectives, this utility model provides the following technical solution: a split-type hot blast stove. The system includes a main hot blast stove and separate heat exchangers. The main hot blast stove contains a main heat exchanger. Within the main heat exchanger, a first chamber is used for fuel combustion and flue gas circulation. A second chamber is used for heat exchange air circulation within the main heat exchanger and between the main hot blast stove shell and the main heat exchanger. The first and second chambers are arranged alternately and adjacently. The separate heat exchangers contain a third and a fourth chamber, also arranged alternately and adjacently. The third chamber is a tubular flue, and the fourth chamber is a heat exchange channel. The first and third chambers are connected, and the second and fourth chambers are connected. A blower is installed at the end of the fourth cavity away from the second cavity in the channel formed by the second cavity and the fourth cavity, and a hot air outlet is provided at the end of the second cavity away from the fourth cavity in the channel formed by the second cavity and the fourth cavity. The channel formed by the first cavity and the third cavity has a smoke induced motor installed at the end of the third cavity away from the first cavity, and a combustion chamber opening is provided at the end of the channel formed by the first cavity away from the third cavity.

[0005] In this design, the hot flue gas generated after combustion in the main hot blast stove undergoes several heat exchanges within the main furnace. The exhaust flue gas then enters the third chamber through the first chamber, where it exchanges heat with the cold air blown into the fourth chamber by the blower, fully absorbing the residual heat of the flue gas and preheating the cold air. After the cold air is preheated and its temperature rises, it is introduced into the second chamber of the main hot blast stove through a connecting bend pipe for further heat exchange. This effectively increases the space and pathway for heat exchange, which is beneficial for energy saving and emission reduction.

[0006] Optionally, a connecting channel is provided on the side of the middle part of the main heat exchanger, and the first cavity and the third cavity are connected through the connecting channel.

[0007] Optionally, the side of the middle part of the main heat exchanger is provided with a lower ash removal port extending to the outer wall of the main hot air furnace.

[0008] Both the first and second chambers are cylindrical. A smoke outlet and a normally closed cleaning port are located on opposite sides of the lower part of the first chamber. The smoke outlet connects the first and third chambers, while the normally closed cleaning port is used for cleaning operations during inspection or maintenance. The main function of this design is to increase heat exchange efficiency by increasing the surface area of ​​the metal partition between the first and third chambers.

[0009] Optionally, the top of the main heat exchanger is provided with an elliptical end cap, which can effectively prevent cracking and burn-out of the top plate, and increase the heat exchange area.

[0010] Optionally, a U-shaped annular connecting plate is provided at the connection between the main heat exchanger and the heat exchange channel and / or the flue.

[0011] The U-shaped annular connecting plate allows for smoother flow of flue gas from the combustion chamber into the flue, and also ensures smoother airflow within the heat exchange channel. It also increases the heat exchange area and improves heat exchange efficiency.

[0012] Optionally, an arc-shaped connection can be used at the junction of the bottom of the main heat exchanger and the base plate to solve the problem of easy deformation and cracking in this area.

[0013] The beneficial technical effects of this utility model are as follows: by designing a split heat exchanger, the air input to the main hot blast stove is preheated, effectively utilizing the waste heat of the flue gas discharged from the main hot blast stove, which is conducive to energy saving and emission reduction; through the specially designed heat exchange channel and flue, the heat exchange area at the main hot blast stove is greatly increased while maintaining sufficient space in the combustion chamber of the main hot blast stove, effectively increasing the heat exchange efficiency; at the same time, for the locations where deformation and cracking are prone to occur in other furnace types, a specially designed structure is adopted to avoid the problem of deformation and cracking, thereby improving the stability and service life of the hot air. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an enlarged structural diagram of the U-shaped annular connecting plate in this utility model.

[0015] Attached reference numerals: 1-Main hot air furnace body, 2-Separate heat exchanger, 3-First cavity, 4-Second cavity, 5-Third cavity, 6-Fourth cavity, 7-Main heat exchanger, 8-Combustion chamber, 9-Blower, 10-Hot air outlet, 11-Flue induced draft fan, 12-Combustion chamber furnace opening, 13-Heat exchange channel, 14-Flue, 15-Elliptical end cap, 16-U-shaped connecting plate, 17-Lower ash removal port, 18-Upper ash removal port, 19-Arc-shaped connecting plate, 20-Connecting pipe, 21-Connecting bend, 22-Separate heat exchanger ash removal door, 23-Main heat exchanger bottom plate. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0017] Reference Figure 1 , 2 As shown, a split-type hot air furnace includes a main hot air furnace body 1 and a split heat exchanger body 2. The main hot air furnace body 1 is provided with a main heat exchanger body 7. The cavity inside the main heat exchanger body 1 for fuel combustion and flue gas circulation is a first cavity 3. The cavity for heat exchange air circulation is arranged between the upper cover, outer shell (insulation layer) of the main hot air furnace body 1 and the main heat exchanger body 7, and is arranged alternately and adjacently with the first cavity 3 inside the main heat exchanger body 7. The split heat exchanger body 2 is provided with a third cavity 5 and a fourth cavity 6 arranged alternately and adjacently. The first cavity 3 and the third cavity 5 are connected to form a flue gas circulation channel, and the second cavity 4 and the fourth cavity 6 are connected to form a heat exchange air circulation channel. A blower 9 is installed at one end of the heat exchange air passage in the fourth chamber; a hot air outlet 10 is located at one end of the heat exchange air passage in the second chamber. The flue gas passage is formed by the first cavity 3 and the third cavity 5. A flue gas induced draft fan 11 is installed at one end of the flue gas passage in the third cavity, and the flue gas passage at one end of the first cavity is the combustion chamber opening 12 for the burner to enter the furnace body.

[0018] The top side of the main heat exchanger 7 extends downward to form a flue 14. Several upper ash cleaning ports 18 are connected to the upper side of the flue 14. The upper ash cleaning ports 18 are normally closed and are only opened during ash cleaning or maintenance. Four lower ash cleaning ports 17 are connected to the lower side of the flue 14. One of the ash cleaning ports serves as the flue outlet of the main hot air furnace body 1 and is connected to a connecting pipe 20, which connects the first cavity 3 of the main hot air furnace body 1 to the third cavity 5 in the split heat exchanger 2. The other three ash cleaning ports 17 are normally closed and are only opened during ash cleaning or maintenance. The flue gas from the combustion of particulate fuel in the combustion chamber 8 of the main hot air furnace body 1 exchanges heat with the heat exchange air in the heat exchange channel 13 of the second chamber 4 after passing through the side wall of the combustion chamber, the elliptical head 15 of the main heat exchanger, and the side wall of the flue 14. Then, it is introduced into the tubular flue in the third chamber 5 of the split heat exchanger 2 through the connecting pipe 20, and continues to exchange heat with the heat exchange air in the fourth chamber 6. Finally, it is discharged by the smoke induced draft fan 11.

[0019] At the inlet end of the top of the fourth chamber 6 in the split heat exchanger 2, there is a blower 9 that introduces heat exchange air into the fourth chamber 6. After heat exchange with the flue gas in the third chamber 5, the preheated heat exchange air in the fourth chamber 6 of the split heat exchanger 2 is introduced into the second chamber 4 of the main hot air furnace 1 through the outlet end of the fourth chamber 6 of the split heat exchanger 2. It continues to exchange heat with the flue gas in the first chamber 3, and finally exits through the hot air outlet 10 of the main hot air furnace 1 to the part of the tea processing flow that requires high-temperature air.

[0020] Several cleaning ports 22 are provided on the side wall of the third chamber in the split heat exchanger that supplies flue gas. These ports are normally closed and are only opened during maintenance and cleaning.

[0021] The main heat exchanger 7 is equipped with an elliptical end cap 15 at the top, which can effectively prevent cracking and burn-out of the top plate, and increase the effective heat exchange area.

[0022] A U-shaped connecting plate 16 is provided at the upper part of the heat exchange passage adjacent to the combustion chamber 8 and the flue 14 in the main heat exchanger 7. The U-shaped connecting plate 16 can reduce the resistance and make the flow smoother when the flue gas in the first cavity 3 enters the flue 14 from the combustion chamber 8, and when the heat exchange air in the heat exchange passage 13 in the second cavity 4 turns at this point. At the same time, it increases the heat exchange area and improves the heat exchange efficiency.

[0023] At the connection between the main heat exchanger 7 and the main heat exchanger base plate 23, the joint is prone to deformation and cracking due to thermal expansion and contraction at high temperatures. In this example, an arc-shaped connecting plate 19 is used here to avoid the problem of deformation and cracking.

[0024] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A split-type hot air furnace, characterized in that: The system includes a main hot blast stove and a separate heat exchanger. The main hot blast stove contains a main heat exchanger. The first chamber within the main heat exchanger is used for fuel combustion and flue gas circulation. The second chamber within the main heat exchanger and between the main hot blast stove shell and the main heat exchanger is used for heat exchange air circulation. The first and second chambers are arranged alternately and adjacently. The separate heat exchanger contains a third and a fourth chamber arranged alternately and adjacently. The third chamber is a tubular flue, and the fourth chamber is a heat exchange channel. The first and third chambers are connected, and the second and fourth chambers are connected. A blower is installed at the end of the fourth cavity away from the second cavity in the channel formed by the second cavity and the fourth cavity, and a hot air outlet is provided at the end of the second cavity away from the fourth cavity in the channel formed by the second cavity and the fourth cavity. The channel formed by the first cavity and the third cavity has a smoke induced motor installed at the end of the third cavity away from the first cavity, and a combustion chamber opening is provided at the end of the channel formed by the first cavity away from the third cavity.

2. A split-type hot air furnace according to claim 1, characterized in that: A connecting channel is provided on the side of the middle part of the main heat exchanger, and the first cavity and the third cavity are connected through the connecting channel.

3. A split-type hot air furnace according to claim 2, characterized in that: The main heat exchanger has several lower ash removal ports extending to the outer wall of the main hot blast stove on its side in the middle.

4. A split-type hot air furnace according to claim 2, characterized in that: The main heat exchanger has several upper ash cleaning ports extending to the outer wall of the main hot blast stove on its side in the middle section. The upper ash cleaning ports are located above the lower ash cleaning ports.

5. A split-type hot air furnace according to claim 1, characterized in that: The main heat exchanger is provided with an elliptical end cap at its top.

6. A split-type hot air furnace according to claim 1, characterized in that: An arc-shaped connecting plate is used at the connection between the main heat exchanger and the base plate.

7. A split-type hot air furnace according to claim 1, characterized in that: The second cavity and the fourth cavity are connected by a connecting bend at the top of the main hot air furnace and the split heat exchanger.

8. A split-type hot air furnace according to claim 1, characterized in that: A U-shaped annular connecting plate is provided at the connection between the main heat exchanger and the heat exchange channel and / or the flue.

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