Economizer of papermaking coal-fired boiler

Abstract

The utility model discloses a coal economizer of a papermaking coal-fired boiler, which comprises a shell, a water inlet tank, a water return tank, a water discharge tank, a heat conducting plate, a first heat conducting pipe and a second heat conducting pipe, the water inlet tank, the water return tank and the water discharge tank are all arranged on the shell, and two ends of the first heat conducting pipe are respectively communicated with the water inlet tank and the water return tank. The two ends of the second heat conduction pipe are communicated with the water return tank and the water drainage tank respectively, the first heat conduction pipe and the second heat conduction pipe penetrate through the heat conduction plate, heat conduction sleeves penetrate through the first heat conduction pipe and the second heat conduction pipe, heat conduction pieces are fixedly connected to the two sides of the heat conduction sleeves in the horizontal direction, and each heat conduction piece is provided with a plurality of vent holes. The heat-conducting plate, the heat-conducting sleeve and the heat-conducting fin are used for absorbing heat of smoke at the same time, the heating effect on water in the first heat-conducting pipe and the second heat-conducting pipe is improved, and the advantage of high heat-absorbing efficiency is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of economizers, in particular to an economizer for a papermaking coal-fired boiler. Background Art

[0002] An economizer is a device installed at the bottom of the flue at the rear of the boiler to recover the waste heat of the exhaust gas. The waste heat of the flue gas is used to heat the boiler feed water, thereby increasing the temperature of the water input to the boiler, reducing the heat required to generate steam in the boiler, saving coal consumption and improving efficiency.

[0003] Chinese invention patent publication number CN117906137B discloses a low-temperature economizer for a boiler, comprising an economizer bracket installed in a flue, an economizer body fixedly attached to the bracket, and wiping assemblies located on both sides of the economizer body. The economizer body includes a water supply pipe and heat exchange fins, with the fins arranged on the outer wall of the water supply pipe at equal intervals along the width of the economizer bracket. The wiping assemblies are slidably connected to the economizer bracket at both ends of the heat exchange fins, with the sliding direction aligning with the length of the fins. The wiping assemblies include multiple reversible and deployable wiping bodies. When deployed, the wiping bodies are positioned between and in contact with the two heat exchange fins. The wiping assemblies can periodically wipe the surfaces of the heat exchange fins to remove soot particles accumulated on the fins, thereby ensuring the heat exchange efficiency of the economizer.

[0004] The existing economizer absorbs heat from the flue gas through heat exchange fins, but the effect is relatively limited, resulting in low heat absorption efficiency. Therefore, the existing economizer has a technical problem of low heat absorption efficiency. Utility Model Content

[0005] In order to solve the above technical problems, the purpose of the present utility model is to provide an economizer for a papermaking coal-fired boiler, which includes a shell, a water inlet tank, a return water tank, a drainage tank, a heat conduction plate, a first heat conduction pipe and a second heat conduction pipe. The economizer of the papermaking coal-fired boiler has the advantage of high heat absorption efficiency.

[0006] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0007] A economizer for a paper-making coal-fired boiler, comprising a housing, a water inlet tank, a water return tank, a drainage tank, a heat conduction plate, a first heat conduction pipe and a second heat conduction pipe. The water inlet tank, the water return tank and the drainage tank are all installed on the housing. The two ends of the first heat conduction pipe are respectively communicated with the water inlet tank and the water return tank. The two ends of the second heat conduction pipe are respectively communicated with the water return tank and the drainage tank. The housing is provided with an air inlet and an air outlet. The first heat conduction pipe and the second heat conduction pipe are located between the air inlet and the air outlet. The water inlet tank is provided with a water inlet, and the drainage tank is provided with a drainage outlet. The first heat conduction pipe and the second heat conduction pipe both penetrate through the heat conduction plate, and the first heat conduction pipe and the second heat conduction pipe are both provided with heat conduction sleeves. The two sides of the heat conduction sleeve in the horizontal direction are fixedly connected with heat conduction fins, and the heat conduction fins are provided with a plurality of ventilation holes.

[0008] Through such a setting: the heat conduction plate, the heat conduction sleeve and the heat conduction fins simultaneously absorb the heat of the flue gas, improving the heating effect on the water in the first heat conduction pipe and the second heat conduction pipe, achieving the advantage of higher heat absorption efficiency.

[0009] Preferably, the heat conduction fins are inclined.

[0010] Through such a setting: improving the contact effect of the heat conduction fins absorbing the heat of the flue gas.

[0011] Preferably, the end of the heat conduction fin away from the heat conduction sleeve is inclined downward.

[0012] Through such a setting: making the flow of the flue gas smoother.

[0013] Preferably, the end of the heat conduction plate is clamped with the heat conduction sleeve.

[0014] Through such a setting: playing a role in improving the structural stability between the heat conduction plate and the heat conduction sleeve.

[0015] Preferably, the heat conduction plate is fixedly connected with a limiting block, and the limiting block is clamped with the heat conduction fin.

[0016] Through such a setting: playing a role in improving the stability of the heat conduction sleeve and the heat conduction fin.

[0017] Preferably, a plurality of the heat conduction plates and the heat conduction sleeves are both provided, and the plurality of heat conduction plates and the plurality of heat conduction sleeves are alternately arranged.

[0018] Through such a setting: further improving the heat absorption efficiency.

[0019] Preferably, the limiting block penetrates through the heat conduction plate.

[0020] Through such a setting: making the force on the heat conduction plate more balanced.

[0021] Preferably, a plurality of the first heat conduction pipes and the second heat conduction pipes are both provided.

[0022] By such a setting, the heating efficiency of water is improved.

[0023] Preferably, the projections of the plurality of first heat-conducting tubes on a horizontal plane are staggeredly arranged.

[0024] By such a setting, the function of improving the heat absorption efficiency is achieved.

[0025] Preferably, the projections of the plurality of second heat-conducting tubes on a horizontal plane are staggeredly arranged.

[0026] By such a setting, the function of improving the heat absorption efficiency is achieved.

[0027] Compared with the prior art, the utility model has achieved beneficial technical effects:

[0028] Water is added into the water inlet tank through the water inlet. The water in the water inlet tank flows into the return water tank through the first heat-conducting tube. The water in the return water tank flows into the drainage tank through the second heat-conducting tube. The water in the drainage tank is discharged through the drainage port. Flue gas is fed into the shell through the air inlet. The flue gas contacts the heat-conducting plate, the heat-conducting sleeve and the heat-conducting sheet, and the heat of the flue gas is simultaneously absorbed by the heat-conducting plate, the heat-conducting sleeve and the heat-conducting sheet, so as to improve the heating effect on the water in the first heat-conducting tube and the second heat-conducting tube, achieving the advantage of relatively high heat absorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of an economizer of a paper-making coal-fired boiler in an embodiment of the utility model;

[0030] Figure 2 is a schematic internal structural diagram of the shell in an embodiment of the utility model;

[0031] Figure 3 is a schematic structural diagram of the first heat-conducting tube and the second heat-conducting tube in an embodiment of the utility model;

[0032] Figure 4 is a schematic structural diagram of the heat-conducting sleeve and the heat-conducting plate in an embodiment of the utility model.

[0033] Among them, the technical features represented by the respective reference numerals are as follows:

[0034] 11, shell; 12, air inlet; 13, air outlet; 21, water inlet tank; 22, return water tank; 23, drainage tank; 24, first heat-conducting tube; 25, second heat-conducting tube; 26, water inlet; 27, drainage port; 31, heat-conducting plate; 32, limiting block; 33, heat-conducting sleeve; 34, heat-conducting sheet; 35, ventilation hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to make the purpose, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with embodiments. However, the scope of protection claimed by the present utility model is not limited to the specific embodiments described below.

[0036] Reference Figures 1-4 , an economizer for a paper-making coal-fired boiler, comprising a housing 11, a water inlet tank 21, a water return tank 22, a drainage tank 23, a heat conduction plate 31, a first heat conduction pipe 24 and a second heat conduction pipe 25.

[0037] The water inlet tank 21, the water return tank 22 and the drainage tank 23 are all installed on the housing 11. The two ends of the first heat conduction pipe 24 are respectively communicated with the water inlet tank 21 and the water return tank 22, and the two ends of the second heat conduction pipe 25 are respectively communicated with the water return tank 22 and the drainage tank 23. The housing 11 is provided with an air inlet 12 and an air outlet 13. The first heat conduction pipe 24 and the second heat conduction pipe 25 are located between the air inlet 12 and the air outlet 13. The water inlet tank 21 is provided with a water inlet 26, and the drainage tank 23 is provided with a drainage port 27. A plurality of the first heat conduction pipes 24 and a plurality of the second heat conduction pipes 25 are provided in total. The plurality of first heat conduction pipes 24 and the plurality of second heat conduction pipes 25 simultaneously absorb the heat of the flue gas at different positions, further improving the heat absorption effect and the heating efficiency of the water. The projections of the plurality of first heat conduction pipes 24 on the horizontal plane are staggeredly arranged, and the air inlet 12 is located above the exhaust port. So that the plurality of first heat conduction pipes 24 are respectively in contact with the flue gas at different positions in the horizontal direction, ensuring that the flue gas at different positions can be absorbed by the first heat conduction pipe 24, playing a role in improving the heat absorption efficiency. The projections of the plurality of second heat conduction pipes 25 on the horizontal plane are staggeredly arranged, so that the plurality of second heat conduction pipes 25 are respectively in contact with the flue gas at different positions in the horizontal direction, ensuring that the flue gas at different positions can be absorbed by the second heat conduction pipe 25, playing a role in improving the heat absorption efficiency.

[0038] Both the first heat conduction tube 24 and the second heat conduction tube 25 are provided with heat conduction sleeves 33, and the first heat conduction tube 24 and the second heat conduction tube 25 are located inside the housing 11. Both sides of the heat conduction sleeve 33 in the horizontal direction are fixedly connected with heat conduction fins 34, and the heat conduction fins 34 are provided with a plurality of ventilation holes 35. The heat conduction fins 34 are inclined, so that the flue gas can flow along the inclined direction of the heat conduction fins 34 and maintain a state of contacting the heat conduction fins 34, improving the contact effect of the heat conduction fins 34 absorbing the heat of the flue gas. One end of the heat conduction fin 34 away from the heat conduction sleeve 33 is inclined downward, reducing the resistance generated by the heat conduction fin 34 to the flue gas and making the flow of the flue gas smoother. Both the first heat conduction tube 24 and the second heat conduction tube 25 are arranged through the heat conduction plate 31, and the end of the heat conduction plate 31 is clamped with the end of the heat conduction sleeve 33. The heat conduction plate 31 and the heat conduction sleeve 33 support each other, playing a role in improving the structural stability between the heat conduction plate 31 and the heat conduction sleeve 33. The heat conduction plate 31 is fixedly connected with a limiting block 32, and the limiting block 32 is clamped with the heat conduction fin 34. By using the limiting block 32 to clamp the heat conduction fin 34, the rotation of the heat conduction sleeve 33 and the heat conduction fin 34 is prevented, playing a role in improving the stability of the heat conduction sleeve 33 and the heat conduction fin 34. Both the heat conduction plate 31 and the heat conduction sleeve 33 are provided with a plurality of them, and the plurality of heat conduction plates 31 and the plurality of heat conduction sleeves 33 are arranged alternately, further improving the heat absorption efficiency. The limiting block 32 is arranged through the heat conduction plate 31, so that the limiting block 32 can limit the heat conduction sleeves 33 and the heat conduction fins 34 on both sides of the heat conduction plate 31, improving the stability of the heat conduction sleeve 33 and making the force on the heat conduction plate 31 more balanced.

[0039] The first heat conduction tube 24 is located on the side of the second heat conduction tube 25 close to the air outlet 13. The water in the first heat conduction tube 24 absorbs heat and rises in temperature and then flows into the second heat conduction tube 25. Since the second heat conduction tube 25 is closer to the air inlet 12 than the first heat conduction tube 24, the air at the air inlet 12 has a higher temperature because it has not absorbed heat through the heat conduction plate 31. Furthermore, the water in the second heat conduction tube 25 can be heated by the relatively high-temperature flue gas, ensuring that the temperature of the water in the second heat conduction tube 25 can rise.

[0040] This embodiment has the following advantages:

[0041] Water is added into the water inlet tank 21 through the water inlet 26. The water in the water inlet tank 21 flows into the water return tank 22 through the first heat conduction tube 24. The water in the water return tank 22 flows into the drainage tank 23 through the second heat conduction tube 25. The water in the drainage tank 23 is discharged through the drain outlet 27. The flue gas is sent into the housing 11 through the air inlet 12. The flue gas contacts the heat conduction plate 31, the heat conduction sleeve 33 and the heat conduction fin 34. The heat conduction plate 31, the heat conduction sleeve 33 and the heat conduction fin 34 simultaneously absorb the heat of the flue gas, improving the heating effect on the water in the first heat conduction tube 24 and the second heat conduction tube 25, achieving the advantage of relatively high heat absorption efficiency.

[0042] The heat-conducting sheet 34 is perpendicular to the heat-conducting plate 31, so that the heat-conducting sheet 34 and the heat-conducting plate 31 can be in contact with the flue gas at different positions respectively, further promoting the heat transfer in the flue gas to the first heat-conducting tube 24 and the second heat-conducting tube 25, and having the advantage of improving the heat absorption effect.

[0043] When the flue gas is blocked by the heat-conducting sheet 34 during the flowing process, eddy currents are likely to be generated on the side of the heat-conducting sheet 34 away from the air inlet 12. The existence of the eddy currents increases the residence time of part of the flue gas in the housing 11. After the flue gas is heat-absorbed and its temperature drops, and then it is retained in the flue gas, the heat transferred to the heat-conducting sheet 34 will be reduced. By arranging ventilation holes 35 on the heat-conducting sheet 34, the flue gas can directly enter the side of the large heat sheet away from the air inlet 12 through the ventilation holes 35, thereby preventing the generation of eddy currents at the heat-conducting sheet 34, enabling the side of the heat-conducting sheet 34 away from the air inlet 12 to also have flue gas with a relatively high temperature flowing through, further increasing the heat transferred to the heat-conducting sheet 34. Moreover, the arrangement of the ventilation holes 35 can also increase the contact area between the heat-conducting sheet 34 and the flue gas, further improving the heat absorption effect of the heat-conducting sheet 34 on the flue gas and enhancing the heating effect on the water in the first heat-conducting tube 24 and the second heat-conducting tube 25.

[0044] According to the disclosure and teachings of the above specification, those skilled in the art of the present utility model can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the utility model.

Claims

1. A economizer for a paper-making coal-fired boiler, characterized in that: It includes a housing (11), a water inlet tank (21), a water return tank (22), a drainage tank (23), a heat conduction plate (31), a first heat conduction pipe (24) and a second heat conduction pipe (25). The water inlet tank (21), the water return tank (22) and the drainage tank (23) are all installed on the housing (11). The two ends of the first heat conduction pipe (24) are respectively communicated with the water inlet tank (21) and the water return tank (22). The two ends of the second heat conduction pipe (25) are respectively communicated with the water return tank (22) and the drainage tank (23). The housing (11) is provided with an air inlet (12) and an air outlet (13). The first heat conduction pipe (24) and the second heat conduction pipe (25) are located between the air inlet (12) and the air outlet (13). The water inlet tank (21) is provided with a water inlet (26). The drainage tank (23) is provided with a drainage outlet (27). The first heat conduction pipe (24) and the second heat conduction pipe (25) both pass through the heat conduction plate (31). The first heat conduction pipe (24) and the second heat conduction pipe (25) are both provided with heat conduction sleeves (33). The two sides of the heat conduction sleeve (33) in the horizontal direction are fixedly connected with heat conduction fins (34). The heat conduction fins (34) are provided with a plurality of ventilation holes (35).

2. The economizer of the paper-making coal-fired boiler according to claim 1, wherein: The heat conduction fins (34) are arranged obliquely.

3. The economizer of the papermaking coal-fired boiler according to claim 2, wherein: One end of the heat conduction fin (34) away from the heat conduction sleeve (33) inclines downward.

4. The economizer of the paper-making coal-fired boiler according to claim 1, characterized in that: The heat conduction plate (31) is clamped with the end of the heat conduction sleeve (33).

5. The economizer of the paper-making coal-fired boiler according to claim 1, wherein: The heat conduction plate (31) is fixedly connected with a limiting block (32), and the limiting block (32) is clamped with the heat conduction fin (34).

6. The economizer of the paper-making coal-fired boiler according to claim 5, characterized in that: Both the heat conduction plate (31) and the heat conduction sleeve (33) are provided with a plurality of them, and the plurality of heat conduction plates (31) and the plurality of heat conduction sleeves (33) are arranged alternately.

7. The economizer of the paper-making coal-fired boiler according to claim 6, wherein: The limiting block (32) passes through the heat conduction plate (31).

8. The economizer of the paper-making coal-fired boiler according to claim 1, characterized in that: Both the first heat conduction pipe (24) and the second heat conduction pipe (25) are provided with a plurality of them.

9. The economizer of the paper-making coal-fired boiler according to claim 8, characterized in that: The projections of the plurality of first heat conduction pipes (24) on the horizontal plane are arranged staggeredly.

10. The economizer of the paper-making coal-fired boiler according to claim 8, characterized in that: The projections of the plurality of second heat conduction pipes (25) on the horizontal plane are arranged staggeredly.

Images