Waste heat air recovery device of hot blast stove

Abstract

The utility model relates to the field of hot-blast stoves, in particular to a waste heat air recovery device of a hot-blast stove, which comprises a holding furnace, a conical plate is welded at the top of the inner wall of the holding furnace, a fan is mounted at the center of the outer wall of the top of the holding furnace, and a discharge port is arranged on the outer wall of the bottom of the holding furnace. Slag discharging structures are mounted on the inner wall of the heat preservation furnace and the discharging opening, and a heating assembly is mounted on the inner wall of the heat preservation furnace; the deslagging structure comprises cleaning screws rotationally connected to the two ends of the inner wall of the heat preservation furnace, cleaning rings connected to the outer walls of the cleaning screws in a threaded mode and a guide cylinder installed at the bottom of the heat preservation furnace and located at a discharging port. The heating assembly comprises mounting bases mounted at the two ends of the inner wall of the heat preservation furnace at equal intervals. The cleaning motor drives the cleaning screw to rotate, the cleaning ring is slidably connected to the inner wall of the heat preservation furnace after the cleaning screw rotates, impurities on the inner wall of the heat preservation furnace are hung down by the cleaning ring with the trapezoidal section, the airflow conveying amount is guaranteed, and the conveying efficiency is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast stoves, and particularly relates to a waste heat air recovery device for a hot blast stove. Background Art

[0002] A hot blast stove is a thermal power machine that has been widely used in China since the late 1970s. It has become a replacement product for electric heat sources and traditional steam power heat sources in many industries.

[0003] At present, when the existing hot blast stove is in use, the output heat decreases with the use temperature. However, the gas discharged still has a certain temperature, and the direct discharge of these temperatures is relatively wasteful. Moreover, after the hot blast stove is used for a period of time, due to the heat source material, some impurities will appear on the inner wall, increasing the wall thickness of the furnace body, resulting in a decrease in the output of the equipment and affecting the efficiency. Content of the Utility Model

[0004] The purpose of the utility model is to propose a waste heat air recovery device for a hot blast stove aiming at the above existing problems and deficiencies: The gas containing partial temperature discharged from the equipment enters the top of the conical plate inside the heat preservation furnace through the waste heat pipe. The gas with heat is mixed with the normal temperature gas to preheat the gas entering the inside of the heat preservation furnace, which is convenient for using waste heat and reducing the waste amount. It is convenient for using waste heat and convenient for cleaning the inside.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A waste heat air recovery device for a hot blast stove includes a heat preservation furnace. A conical plate is welded to the top of the inner wall of the heat preservation furnace, and a fan is installed at the center of the outer wall of the top of the heat preservation furnace. A discharge port is opened on the outer wall of the bottom of the heat preservation furnace, and a slag discharge structure is installed on the inner wall and at the discharge port of the heat preservation furnace. A heating component is installed on the inner wall of the heat preservation furnace; the slag discharge structure includes a cleaning screw rotatably connected to both ends of the inner wall of the heat preservation furnace, a cleaning ring threadedly connected to the outer wall of the cleaning screw, and a guiding cylinder installed at the bottom of the heat preservation furnace at the discharge port; the heating component includes mounting seats equidistantly installed at both ends of the inner wall of the heat preservation furnace and a protective pipe installed on the outer wall between the mounting seats.

[0007] According to the above scheme: The fan extracts gas through an air extraction pipe and conveys it into an air inlet pipe. The air inlet pipe and the gas containing partial temperature discharged from the equipment enter the top of the conical plate inside the heat preservation furnace through the waste heat pipe. The gas with heat is mixed with the normal temperature gas to preheat the gas entering the inside of the heat preservation furnace, which is convenient for using waste heat and reducing the waste amount.

[0008] Preferably, a conveying pipe is connected to the top of the outer wall of one side of the guiding cylinder, and the conveying pipe is of an "L" - shaped structure.

[0009] Preferably, a cleaning motor is installed on the outer wall of the top of the heat preservation furnace at the position of the cleaning screw, and the output shaft of the cleaning motor is connected to one end of the cleaning screw. The bottom inner wall of the guiding cylinder is threadedly connected with a sealing cover;

[0010] According to the above solution: The cleaning motor drives the cleaning screw to rotate. After the cleaning screw rotates, the cleaning ring is slidably connected to the inner wall of the heat preservation furnace. The cleaning ring with a trapezoidal cross-section scrapes off the impurities on the inner wall of the heat preservation furnace, ensuring the air flow conveying volume and maintaining the conveying efficiency.

[0011] Preferably, the cleaning ring is a semi-ring structure, and the cross-section of the cleaning ring is a trapezoidal structure. One outer wall of the cleaning ring is slidably connected to the inner wall of the heat preservation furnace, and the cleaning ring is slidably connected between the mounting seats.

[0012] Preferably, one end of the outer wall of the top of the heat preservation furnace is connected with a waste heat pipe, and the output end of the fan is connected with an air inlet pipe. The other end of the air inlet pipe is communicated with the top of the heat preservation furnace, and one-way valves are installed at one ends of the air inlet pipe and the waste heat pipe.

[0013] Preferably, the inlet and outlet ends of the fan are connected with an air extraction pipe, and a filter screen is installed on the inner wall of one end of the air extraction pipe. The bottom of the outer wall of the heat preservation furnace is provided with support legs distributed at equal intervals.

[0014] Preferably, the outer wall of the conical plate is provided with ventilation holes distributed at equal intervals, and a heating wire is arranged on the inner wall of the protective pipe.

[0015] Preferably, the heating wire, the cleaning motor and the fan are connected to a switch through wires, and the switch is connected to a power supply through wires.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. The fan extracts gas through the air extraction pipe and conveys it into the air inlet pipe. The air inlet pipe and the gas containing partial temperature discharged from the equipment enter the inside of the heat preservation furnace through the waste heat pipe at the top of the conical plate. The gas with heat is mixed with the normal temperature gas to preheat the gas entering the inside of the heat preservation furnace, facilitating the utilization of waste heat and reducing the waste amount;

[0018] 2. The cleaning motor drives the cleaning screw to rotate. After the cleaning screw rotates, the cleaning ring is slidably connected to the inner wall of the heat preservation furnace. The cleaning ring with a trapezoidal cross-section scrapes off the impurities on the inner wall of the heat preservation furnace, ensuring the air flow conveying volume and maintaining the conveying efficiency;

[0019] 3. Open the sealing cover at the bottom of the guiding cylinder to discharge the impurities, which is convenient for cleaning the impurities, collecting the impurities and subsequent treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a waste heat air recovery device for a hot blast stove proposed by the present utility model;

[0021] Figure 2 Schematic diagram of the internal structure of a waste heat air recovery device for a hot blast stove proposed by the present utility model;

[0022] Figure 3 Schematic diagram of the unfolded partial structure of a waste heat air recovery device for a hot blast stove proposed by the present utility model;

[0023] Figure 4 Schematic diagram of the cleaning screw structure of a waste heat air recovery device for a hot blast stove proposed by the present utility model.

[0024] In the figure: 1 heat preservation furnace, 2 conical plate, 3 ventilation hole, 4 fan, 5 intake pipe, 6 slag discharge structure, 7 support leg, 8 mounting seat, 9 heating wire, 10 protective pipe, 11 extraction pipe, 12 waste heat pipe, 13 check valve, 14 cleaning screw, 15 cleaning ring, 16 cleaning motor, 17 guide cylinder, 18 conveying pipe, 19 sealing cover. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0026] Embodiment 1:

[0027] Referring to Figures 1-4 , a waste heat air recovery device for a hot blast stove includes a heat preservation furnace 1. A conical plate 2 is welded to the top inner wall of the heat preservation furnace 1, and a fan 4 is installed at the center of the top outer wall of the heat preservation furnace 1. A discharge port is provided on the bottom outer wall of the heat preservation furnace 1, and a slag discharge structure 6 is installed on the inner wall and the discharge port of the heat preservation furnace 1. A heating component is installed on the inner wall of the heat preservation furnace 1;

[0028] One end of the top outer wall of the heat preservation furnace 1 is connected to a waste heat pipe 12, and the output end of the fan 4 is connected to an intake pipe 5. The other end of the intake pipe 5 communicates with the top of the heat preservation furnace 1, and check valves 13 are installed at one end of both the intake pipe 5 and the waste heat pipe 12. The gas containing partial temperature discharged by the equipment enters the inside of the heat preservation furnace 1 through the waste heat pipe 12 and is located at the top of the conical plate 2. The gas with heat is mixed with the normal temperature gas to preheat the gas entering the inside of the heat preservation furnace 1;

[0029] The inlet and outlet ends of the fan 4 are connected to an extraction pipe 11, and a filter screen is installed on the inner wall of one end of the extraction pipe 11. Support legs 7 are installed on the bottom outer wall of the heat preservation furnace 1 at equal distances.

[0030] The heating component includes mounting seats 8 installed at both ends of the inner wall of the heat preservation furnace 1 at equal distances and a protective pipe 10 installed on the outer wall between the mounting seats 8;

[0031] The outer wall of the conical plate 2 is provided with ventilation holes 3 distributed at equal distances, and a heating wire 9 is provided on the inner wall of the protective pipe 10. The gap between the top of the heat preservation furnace 1 and the conical plate 2 is used for the mixing of gas and waste heat gas, which is convenient for preheating the gas, ensuring the heating efficiency of the gas, and facilitating use.

[0032] The heating wire 9, the cleaning motor 16 and the blower 4 are connected to the switch through wires, and the switch is connected to the power supply through wires. When the heating wire 9 is started, it heats the heat preservation furnace 1 inside the protective pipe 10. After the gas is heated, it is transported to the using equipment through the delivery pipe 18 on the guiding cylinder 17 to complete the cycle.

[0033] Embodiment 2:

[0034] Refer to Figures 2-3 , the slag discharging structure 6 includes a cleaning screw 14 rotatably connected to both ends of the inner wall of the heat preservation furnace 1, a cleaning ring 15 threadedly connected to the outer wall of the cleaning screw 14, and a guiding cylinder 17 installed at the bottom of the heat preservation furnace 1 at the discharge port. The cleaning motor 16 drives the cleaning screw 14 to rotate. After the cleaning screw 14 rotates, the cleaning ring 15 slides on the inner wall of the heat preservation furnace 1. The cleaning ring 15 with a trapezoidal cross-section scrapes off the impurities on the inner wall of the heat preservation furnace 1.

[0035] A delivery pipe 18 is connected to the top of one side outer wall of the guiding cylinder 17, and the delivery pipe 18 is of an "L" - shaped structure. The delivery pipe 18 on the guiding cylinder 17 is of an "L" - shaped structure, so that the air flow needs to move upward into the delivery pipe 18 when entering the guiding cylinder 17, avoiding the impurities being carried out by the air flow and facilitating use.

[0036] A cleaning motor 16 is installed on the top outer wall of the heat preservation furnace 1 at the position of the cleaning screw 14, and the output shaft of the cleaning motor 16 is connected to one end of the cleaning screw 14. The bottom inner wall of the guiding cylinder 17 is threadedly connected with a sealing cover 19. By opening the sealing cover 19 at the bottom of the guiding cylinder 17, the impurities can be discharged, which is convenient for cleaning the impurities.

[0037] The cleaning ring 15 is a semi - ring structure, and the cross - section of the cleaning ring 15 is a trapezoidal structure. One side outer wall of the cleaning ring 15 slides on the inner wall of the heat preservation furnace 1, and the cleaning ring 15 slides between the mounting seats 8. Under the action of the cleaning motor 16 and the cleaning screw 14, the cleaning ring 15 slides on the inner wall of the heat preservation furnace 1 between the mounting seats 8 to clean the inner wall of the main part, which is convenient for ensuring the conveying amount and maintaining the conveying efficiency.

[0038] Working principle: When in use, one end of the conveying pipe 18 is connected to the access end of the using device, and the other end of the waste heat pipe 12 is connected to the discharge end of the using device. During normal use, the fan 4 extracts gas through the air extraction pipe 11 and conveys it into the air inlet pipe 5. The air inlet pipe 5 conveys the gas to the top of the conical plate 2 inside the heat preservation furnace 1. The gas containing partial temperature discharged from the using device enters the top of the conical plate 2 inside the heat preservation furnace 1 through the waste heat pipe 12. The gas with heat is mixed with the normal temperature gas to preheat the gas entering the inside of the heat preservation furnace 1. Subsequently, the gas enters the inside of the heat preservation furnace 1 through the ventilation holes 3. At this time, the heating wire 9 inside the heat preservation furnace 1 starts to heat the heat preservation furnace 1 inside the protective pipe 10. After the gas is heated, it is conveyed to the using device through the conveying pipe 18 on the guiding cylinder 17, completing the cycle, facilitating the preheating of the heated gas using the preheat, and ensuring the gas heating efficiency. After using for a period of time, impurities appear on the inner wall of the heat preservation furnace 1. At this time, the cleaning motor 16 is started to drive the cleaning screw 14 to rotate. After the cleaning screw 14 rotates, the cleaning ring 15 is slidably connected to the inner wall of the heat preservation furnace 1. The cleaning ring 15 with a trapezoidal cross-section scrapes off the impurities on the inner wall of the heat preservation furnace 1. The fallen impurities are collected at the bottom of the guiding cylinder 17. After a period of time, the sealing cover 19 at the bottom of the guiding cylinder 17 is opened to discharge the impurities, facilitating the cleaning of the impurities.

[0039] The exemplary embodiments of the present invention are described in detail with reference to the embodiments. However, those skilled in the art can understand that without departing from the concept of the present invention, various modifications and variations can be made to the above specific embodiments, and various combinations can be made to the technical features and structures proposed by the present invention, without exceeding the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims. The foregoing description of the specific exemplary embodiments of the present invention is not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations can be made in accordance with the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A waste heat air recovery device for a hot blast stove, comprising a heat preservation furnace (1), characterized in that: A conical plate (2) is welded to the top of the inner wall of the insulation furnace (1), and a fan (4) is installed at the center of the top outer wall of the insulation furnace (1), a discharge port is opened on the bottom outer wall of the insulation furnace (1), and a slag discharge structure (6) is installed on the inner wall of the insulation furnace (1) and the discharge port, and a heating component is installed on the inner wall of the insulation furnace (1); The slag discharge structure (6) comprises a cleaning screw (14) rotatably connected to both ends of the inner wall of the insulation furnace (1), a cleaning ring (15) threadedly connected to the outer wall of the cleaning screw (14), and a guide cylinder (17) installed at the bottom of the insulation furnace (1) at the discharge port; The heating assembly comprises mounting seats (8) mounted at equal distances on both ends of the inner wall of the heat preservation furnace (1) and a protective tube (10) mounted on the outer wall between the mounting seats (8).

2. The waste heat air recovery device for a hot blast stove according to claim 1, characterized in that: A delivery pipe (18) is connected to the top of one side outer wall of the guide cylinder (17), and the delivery pipe (18) is an "L"-shaped structure.

3. The waste heat air recovery device for a hot blast stove according to claim 1, characterized in that: A cleaning motor (16) is installed on the top outer wall of the heat preservation furnace (1) at the cleaning screw (14), and the output shaft of the cleaning motor (16) is connected to one end of the cleaning screw (14). A sealing cover (19) is threadedly connected to the bottom inner wall of the guide cylinder (17).

4. The waste heat air recovery device for a hot blast stove according to claim 1, characterized in that: The cleaning ring (15) is a semi-ring structure, and the cross-section of the cleaning ring (15) is a trapezoidal structure. The outer wall of one side of the cleaning ring (15) is slidably connected to the inner wall of the insulation furnace (1), and the cleaning ring (15) is slidably connected between the mounting seats (8).

5. The waste heat air recovery device for a hot blast stove according to claim 1, characterized in that: One end of the top outer wall of the insulation furnace (1) is connected to a waste heat pipe (12), and the output end of the fan (4) is connected to an air intake pipe (5), the other end of the air intake pipe (5) is connected to the top of the insulation furnace (1), and one end of the air intake pipe (5) and the waste heat pipe (12) are both installed with a one-way valve (13).

6. The waste heat air recovery device for a hot blast stove according to claim 1, characterized in that: The inlet and outlet ends of the fan (4) are connected to an exhaust pipe (11), and a filter is installed on the inner wall of one end of the exhaust pipe (11). The bottom of the outer wall of the insulation furnace (1) is installed with supporting legs (7) distributed at equal distances.

7. The waste heat air recovery device for a hot blast stove according to claim 1, characterized in that: The outer wall of the conical plate (2) is provided with vent holes (3) distributed at equal distances, and the inner wall of the protective tube (10) is provided with a heating wire (9).

8. The waste heat air recovery device for a hot blast stove according to claim 7, characterized in that: The heating wire (9), the cleaning motor (16) and the fan (4) are connected to a switch via a wire, and the switch is connected to a power source via a wire.

Images