Biomass gas waste heat flue gas heat exchanger

Abstract

The utility model discloses a biomass gas waste heat flue gas heat exchanger which comprises a furnace body and a radiation section coil pipe. Wherein a radiation heat exchange chamber is arranged in the furnace body, the radiation section coil pipe is installed in the radiation heat exchange chamber, the radiation section coil pipe comprises an upper coil pipe part, a left coil pipe part, a right coil pipe part and a lower coil pipe part, the left coil pipe part and the right coil pipe part are arranged in parallel, the upper coil pipe part is located above the left coil pipe part and the right coil pipe part, and the lower coil pipe part is located above the left coil pipe part and the right coil pipe part. The lower coil pipe part is located below the left coil pipe part and the right coil pipe part, the upper end part of the left coil pipe part and the upper end part of the right coil pipe part are respectively connected with the upper coil pipe part, and the lower end part of the left coil pipe part and the lower end part of the right coil pipe part are respectively connected with the lower coil pipe part. According to the utility model, the radiation heating area of the radiation section coil pipe can be increased, and the heat exchange efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to a biomass gas waste heat flue gas heat exchanger. Background Art

[0002] Currently, biomass is a renewable, low-pollution, and widely available energy source. To improve the combustion efficiency of biomass, a biomass gasifier can be used to gasify ordinary biomass fuel into biomass gas before burning it. The gasified biomass gas is first transported to a combustion chamber for combustion, and the flue gas generated after combustion needs to be passed into a flue gas heat exchanger for heat exchange. For example, Chinese patent publication number CN209726898U discloses a split-type flue gas heat exchanger. However, in existing flue gas heat exchangers, the radiant section coils mostly adopt a single-tube structure and are arranged around the radiant heat exchange chamber. This single-tube structure has a small radiant heating area and poor heat exchange capacity with the flue gas, resulting in low heat exchange efficiency of the flue gas heat exchanger. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a biomass gas waste heat flue gas heat exchanger, which can increase the radiation heating area of ​​the radiation section coil and thus improve the heat exchange efficiency.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a biomass gas waste heat flue gas heat exchanger, including a furnace body and a radiation section coil;

[0005] The furnace body is provided with a radiation heat exchange chamber, the radiation section coil is installed in the radiation heat exchange chamber, and the radiation section coil includes an upper coil part, a left coil part, a right coil part and a lower coil part;

[0006] The left coil portion and the right coil portion are arranged in parallel;

[0007] The upper coil portion is located above the left coil portion and the right coil portion;

[0008] The lower coil portion is located below the left coil portion and the right coil portion;

[0009] The upper end of the left coil part and the upper end of the right coil part are respectively connected to the upper coil part, and the lower end of the left coil part and the lower end of the right coil part are respectively connected to the lower coil part.

[0010] Further providing a specific structure of the radiant section coil, the radiant section coil includes at least one first furnace tube and at least one second furnace tube;

[0011] The middle portion of the first furnace tube is coiled to form the left coil portion;

[0012] The middle portion of the second furnace tube is coiled to form the right coil portion;

[0013] One end of the first furnace tube and one end of the second furnace tube are coiled in parallel to form the upper coil tube portion;

[0014] The other end of the first furnace tube and the other end of the second furnace tube are coiled in parallel to form the lower coil portion.

[0015] Furthermore, the furnace body is provided with an air inlet and an adiabatic settling chamber;

[0016] The adiabatic settling chamber is located below the radiation heat exchange chamber and communicates with the radiation heat exchange chamber;

[0017] The air inlet is communicated with the adiabatic settling chamber.

[0018] Furthermore, a first ash cleaning door and an explosion-proof door are further provided in the furnace body, and the first ash cleaning door and the explosion-proof door are respectively communicated with the adiabatic settling chamber.

[0019] Furthermore, the furnace body is further provided with an ash discharge chamber, a first convection heat exchange chamber, a second convection heat exchange chamber and a flue gas outlet;

[0020] The ash discharge chamber is located below the first convection heat exchange chamber and the second convection heat exchange chamber;

[0021] The upper end of the radiation heat exchange chamber is communicated with the upper end of the first convection heat exchange chamber;

[0022] The lower end of the first convection heat exchange chamber and the lower end of the second convection heat exchange chamber are respectively communicated with the ash discharge chamber;

[0023] The upper end of the second convection heat exchange chamber is communicated with the flue gas outlet;

[0024] A first convection section coil is installed in the first convection heat exchange chamber, and a second convection section coil is installed in the second convection heat exchange chamber.

[0025] Furthermore, the biomass gas waste heat flue gas heat exchanger further includes a top coil pipe, which is installed on the top of the radiation heat exchange chamber and the top of the first convection heat exchange chamber.

[0026] Furthermore, the biomass gas waste heat flue gas heat exchanger also includes an inlet header and an outlet header, the inlet header is connected to one end of the second convection section coil, the other end of the second convection section coil is connected to one end of the first convection section coil, the other end of the first convection section coil is connected to one end of the radiation section coil, the other end of the radiation section coil is connected to one end of the top coil, and the other end of the top coil is connected to the outlet header.

[0027] Furthermore, the furnace body is provided with a second ash cleaning door connected to the ash discharge chamber.

[0028] Furthermore, a partition is provided between the first convection heat exchange chamber and the second convection heat exchange chamber, and an upper end portion of the partition supports one end of the top coil.

[0029] Furthermore, a heat-insulating wall is provided on the outer wall of the furnace body.

[0030] After adopting the above technical solution, by arranging the left coil part and the right coil part in parallel between the upper coil part and the lower coil part, the radiation heating area of ​​the entire radiation section coil is increased, thereby improving the heat exchange capacity between the radiation section coil and the flue gas, improving the heat exchange efficiency of the radiation section coil, and thereby improving the heat exchange efficiency of the entire biomass gas waste heat flue gas heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a front view of the biomass gas waste heat flue gas heat exchanger of the present utility model;

[0032] Figure 2 This is a left side view of the biomass gas waste heat flue gas heat exchanger of the present utility model;

[0033] Figure 3 This is a front view of the radiation section coil of the utility model;

[0034] Figure 4 This is a top view of the radiation section coil of the utility model;

[0035] Figure 5 It is a left view of the radiation section coil of the present utility model. DETAILED DESCRIPTION

[0036] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0037] like Figures 1 to 5 As shown, a biomass gas waste heat flue gas heat exchanger includes a furnace body 1 and a radiation section coil 2;

[0038] The furnace body 1 is provided with a radiation heat exchange chamber 3, and the radiation section coil 2 is installed in the radiation heat exchange chamber 3. The radiation section coil 2 includes an upper coil part 4, a left coil part 5, a right coil part 6 and a lower coil part 7;

[0039] The left coil portion 5 and the right coil portion 6 are arranged in parallel;

[0040] The upper coil portion 4 is located above the left coil portion 5 and the right coil portion 6;

[0041] The lower coil portion 7 is located below the left coil portion 5 and the right coil portion 6;

[0042] The upper end of the left coil portion 5 and the upper end of the right coil portion 6 are respectively connected to the upper coil portion 4, and the lower end of the left coil portion 5 and the lower end of the right coil portion 6 are respectively connected to the lower coil portion 7; specifically, by arranging the left coil portion 5 and the right coil portion 6 in parallel between the upper coil portion 4 and the lower coil portion 7, the radiation heating area of ​​the entire radiation section coil 2 is increased, thereby improving the heat exchange capacity between the radiation section coil 2 and the flue gas, improving the heat exchange efficiency of the radiation section coil 2, and thereby improving the heat exchange efficiency of the entire biomass gas waste heat flue gas heat exchanger.

[0043] Specifically, the radiation section coil 2 may include at least one first furnace tube and at least one second furnace tube;

[0044] The middle portion of the first furnace tube is coiled to form the left coil portion 5;

[0045] The middle portion of the second furnace tube is coiled to form the right coil portion 6;

[0046] One end of the first furnace tube and one end of the second furnace tube are coiled in parallel to form the upper coil portion 4;

[0047] The other end of the first furnace tube and the other end of the second furnace tube are coiled side by side to form the lower coil section 7. Specifically, compared to the single-tube radiant section coil 2 in the prior art, the provision of the left coil section 5 and the right coil section 6 in the radiant section coil 2 increases the radiant heating area, thereby improving the heat exchange capacity between the radiant section coil 2 and the flue gas, and thus improving the heat exchange efficiency of the radiant section coil 2, thereby improving the heat exchange efficiency of the entire biomass gas waste heat flue gas heat exchanger. In this embodiment, there are two first furnace tubes and two second furnace tubes, respectively.

[0048] like Figure 1 As shown, the furnace body 1 may further be provided with an air inlet 8 and an adiabatic settling chamber 9;

[0049] The adiabatic settling chamber 9 is located below the radiation heat exchange chamber 3 and communicates with the radiation heat exchange chamber 3;

[0050] The air inlet 8 is communicated with the adiabatic settling chamber 9 .

[0051] like Figure 1 As shown, the furnace body 1 may further be provided with a first ash cleaning door 10 and an explosion-proof door 11 , and the first ash cleaning door 10 and the explosion-proof door 11 are respectively communicated with the adiabatic settling chamber 9 .

[0052] like Figure 1As shown, the furnace body 1 may further be provided with an ash discharge chamber 12, a first convection heat exchange chamber 13, a second convection heat exchange chamber 14 and a flue gas outlet 15;

[0053] The ash discharge chamber 12 is located below the first convection heat exchange chamber 13 and the second convection heat exchange chamber 14;

[0054] The upper end of the radiation heat exchange chamber 3 is communicated with the upper end of the first convection heat exchange chamber 13;

[0055] The lower end of the first convection heat exchange chamber 13 and the lower end of the second convection heat exchange chamber 14 are respectively communicated with the ash discharge chamber 12;

[0056] The upper end of the second convection heat exchange chamber 14 is connected to the flue gas outlet 15;

[0057] A first convection section coil 16 is installed in the first convection heat exchange chamber 13, and a second convection section coil 17 is installed in the second convection heat exchange chamber 14. Specifically, flue gas flows into the air inlet 8 and sequentially passes through the adiabatic settling chamber 9, the radiation heat exchange chamber 3, the first convection heat exchange chamber 13, the ash discharge chamber 12, and the second convection heat exchange chamber 14 before being discharged from the flue gas outlet 15. When the flue gas flows into the adiabatic settling chamber 9, the flow velocity slows down, and most of the dust in the flue gas will settle in the adiabatic settling chamber 9, thereby greatly reducing the dust content in the flue gas flowing into the radiation heat exchange chamber 3, the first convection heat exchange chamber 13 and the second convection heat exchange chamber 14. On the one hand, it can reduce the scouring force of the flue gas on the radiation section coil 2, reduce the scouring wear of the radiation section coil 2, and extend the service life of the radiation section coil 2. On the other hand, it can also reduce the ash blockage on the first convection section coil 16 and the second convection section coil 17, improve the safety and stability of operation, and reduce the cleaning frequency and maintenance cost.

[0058] like Figure 1 As shown, the biomass gas waste heat flue gas heat exchanger may further include a top coil pipe 18 , which is installed on the top of the radiation heat exchange chamber 3 and the top of the first convection heat exchange chamber 13 .

[0059] like Figure 1As shown, the biomass gas waste heat flue gas heat exchanger may further include an inlet header 19 and an outlet header 20. The inlet header 19 is connected to one end of the second convection section coil 17, the other end of the second convection section coil 17 is connected to one end of the first convection section coil 16, the other end of the first convection section coil 16 is connected to one end of the radiation section coil 2, the other end of the radiation section coil 2 is connected to one end of the top coil 18, and the other end of the top coil 18 is connected to the outlet header 20. Specifically, after the heat transfer oil flows into the inlet header 19, it flows through the second convection section coil 17, the first convection section coil 16, the radiation section coil 2, and the top coil 18 in sequence, and finally flows out of the outlet header 20. In the radiation heat exchange chamber 3, the flue gas undergoes radiation heat exchange with the heat transfer oil in the radiation section coil 2. In the first convection heat exchange chamber 13, the flue gas undergoes convection heat exchange with the heat transfer oil in the first convection section coil 16. In the second convection heat exchange chamber 14, the flue gas undergoes convection heat exchange with the heat transfer oil in the second convection section coil 17. This allows heat from the flue gas to be collected into the heat transfer oil for utilization. Furthermore, by providing the parallel left and right coil sections 5 and 6 between the upper coil section 4 and the lower coil section 7, the radiation heating area of ​​the entire radiation section coil 2 is greatly increased, improving the heat exchange capacity between the radiation section coil 2 and the flue gas, and increasing the heat exchange efficiency of the radiation section coil 2, thereby improving the heat exchange efficiency of the entire biomass gas waste heat flue gas heat exchanger.

[0060] like Figure 1 As shown, the furnace body 1 may further be provided with a second ash cleaning door 21 communicating with the ash discharge chamber 12 .

[0061] like Figure 1 As shown, a partition 22 is provided between the first convection heat exchange chamber 13 and the second convection heat exchange chamber 14 , the upper end of the partition 22 supports one end of the top coil 18 , and an insulation wall is provided on the outer wall of the furnace body 1 .

[0062] To sum up, by arranging the left coil section 5 and the right coil section 6 in parallel between the upper coil section 4 and the lower coil section 7, the radiation heating area of ​​the entire radiation section coil 2 is increased, thereby improving the heat exchange capacity between the radiation section coil 2 and the flue gas, improving the heat exchange efficiency of the radiation section coil 2, and thereby improving the heat exchange efficiency of the entire biomass gas waste heat flue gas heat exchanger.

[0063] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A biomass gas waste heat flue gas heat exchanger, characterized in that: It comprises a furnace body (1) and a radiation section coil (2); A radiation heat exchange chamber (3) is provided in the furnace body (1), the radiation section coil (2) is installed in the radiation heat exchange chamber (3), and the radiation section coil (2) includes an upper coil portion (4), a left coil portion (5), a right coil portion (6), and a lower coil portion (7); The left coil portion (5) and the right coil portion (6) are arranged in parallel; The upper coil portion (4) is located above the left coil portion (5) and the right coil portion (6); The lower coil portion (7) is located below the left coil portion (5) and the right coil portion (6); The upper end of the left coil part (5) and the upper end of the right coil part (6) are respectively connected to the upper coil part (4), and the lower end of the left coil part (5) and the lower end of the right coil part (6) are respectively connected to the lower coil part (7).

2. The biomass gas waste heat flue gas heat exchanger according to claim 1, characterized in that: The radiation section coil (2) includes at least one first furnace tube and at least one second furnace tube; The middle portion of the first furnace tube is coiled to form the left coil portion (5); The middle portion of the second furnace tube is coiled to form the right coil portion (6); One end portion of the first furnace tube and one end portion of the second furnace tube are coiled in parallel to form the upper coil portion (4); The other end of the first furnace tube and the other end of the second furnace tube are coiled in parallel to form the lower coil portion (7).

3. The biomass gas waste heat flue gas heat exchanger according to claim 1, characterized in that: The furnace body (1) is further provided with an air inlet (8) and an adiabatic settling chamber (9); The adiabatic settling chamber (9) is located below the radiation heat exchange chamber (3) and is in communication with the radiation heat exchange chamber (3); The air inlet (8) is in communication with the adiabatic settling chamber (9).

4. The biomass gas waste heat flue gas heat exchanger according to claim 3, characterized in that: A first ash cleaning door (10) and an explosion-proof door (11) are also provided in the furnace body (1); the first ash cleaning door (10) and the explosion-proof door (11) are respectively communicated with the adiabatic settling chamber (9).

5. The biomass gas waste heat flue gas heat exchanger according to claim 3, characterized in that: The furnace body (1) is further provided with an ash discharge chamber (12), a first convection heat exchange chamber (13), a second convection heat exchange chamber (14) and a smoke outlet (15); The ash discharge chamber (12) is located below the first convection heat exchange chamber (13) and the second convection heat exchange chamber (14); The upper end of the radiation heat exchange chamber (3) is in communication with the upper end of the first convection heat exchange chamber (13); The lower end of the first convection heat exchange chamber (13) and the lower end of the second convection heat exchange chamber (14) are respectively communicated with the ash discharge chamber (12); The upper end of the second convection heat exchange chamber (14) is in communication with the smoke outlet (15); A first convection section coil (16) is installed in the first convection heat exchange chamber (13), and a second convection section coil (17) is installed in the second convection heat exchange chamber (14).

6. The biomass gas waste heat flue gas heat exchanger according to claim 5, characterized in that: It also includes a top coil pipe (18), which is installed on the top of the radiation heat exchange chamber (3) and the top of the first convection heat exchange chamber (13).

7. The biomass gas waste heat flue gas heat exchanger according to claim 6, characterized in that: The invention also includes an inlet header (19) and an outlet header (20), wherein the inlet header (19) is connected to one end of the second convection section coil (17), the other end of the second convection section coil (17) is connected to one end of the first convection section coil (16), the other end of the first convection section coil (16) is connected to one end of the radiation section coil (2), the other end of the radiation section coil (2) is connected to one end of the top coil (18), and the other end of the top coil (18) is connected to the outlet header (20).

8. The biomass gas waste heat flue gas heat exchanger according to claim 5, characterized in that: The furnace body (1) is further provided with a second ash cleaning door (21) communicating with the ash discharge chamber (12).

9. The biomass gas waste heat flue gas heat exchanger according to claim 5, characterized in that: A partition (22) is provided between the first convection heat exchange chamber (13) and the second convection heat exchange chamber (14), and the upper end portion of the partition (22) supports one end of the top coil (18).

10. The biomass gas waste heat flue gas heat exchanger according to claim 1, characterized in that: A heat-insulating wall is provided on the outer wall of the furnace body (1).

Images