CN204265822U - A kind of exhaust-heat boiler inlet high efficient mixed malleation cold gas seal apparatus - Google Patents

Abstract

The utility model discloses a high-efficiency mixed positive pressure cooling air seal device at the inlet of a waste heat boiler. The cooling water jacket is divided into left and right parts, and the upper part is connected with a return pipe, and the lower part is connected with a water supply pipe; the left and right cooling water jackets are set at the flue outlet. Outer circumference, the outer side of the connection between the cooling water jacket and the flue outlet is fitted with a sealed casing. The outer ring of the sealed casing is provided with a through hole, which is connected to one end of the air-cooled branch pipe, and the other end of the air-cooled branch pipe is connected through the air-cooled main pipe. fan. In the case of ensuring the solution of expansion and sealing, the utility model adds a multi-point evenly distributed secondary air system to prevent the leakage of flue gas, which is more conducive to the full combustion of unburned fuel, and performs heat exchange in the waste heat boiler furnace; At the same time, the secondary air cools the flue of the furnace mouth of the smelting furnace, which effectively reduces the corrosion and wear of the flue pipe by the high-temperature flue gas and prolongs the service life. And the manufacture is simple, the structure is safe, energy-saving and environment-friendly.

Description

A high-efficiency mixed positive pressure cooling air seal device at the inlet of waste heat boiler

technical field

The utility model relates to the technical field of nonferrous metallurgical equipment, in particular to a positive pressure cooling air seal device for the inlet of a waste heat boiler of a rotary anode furnace.

Background technique

At present, the rotary anode furnace is the main method of anode copper refining. It uses heavy oil or natural gas as fuel. Compressed air is blown in during the oxidation period, and natural gas or heavy oil is injected into the reduction period. The temperature during the oxidation holding period is about 1100 ° C. At about 1300°C, the positive pressure and negative pressure of the anode furnace flue gas alternate. In order to facilitate the flexible rotation of the flue outlet of the furnace body at the inlet of the waste heat boiler or the secondary combustion chamber, the gap between the inlet of the waste heat boiler or the secondary combustion chamber and the outlet of the furnace body is relatively large. Therefore, it is difficult to seal the flue gas outlet of the furnace body and the inlet of the waste heat boiler, dust and harmful gases leak out, and the operating environment is poor; the leaked high-temperature flue gas poses a serious threat to the body and peripheral equipment; the high air leakage rate increases the The load of the smoke exhaust fan; causing safety hazards to the on-site operators.

Utility model content

The technical problem to be solved by the utility model is to provide a positive pressure cooling air seal device with simple manufacture, safe structure, energy saving and environmental protection, which is conducive to the full combustion of unburned fuel in the rotary anode furnace, and effectively reduces the impact of high temperature flue gas on the flue pipe. Corrosion and wear, prolonging its service life.

The utility model adopts the following technical solutions to achieve the above object. A high-efficiency mixed positive pressure cooling air seal device for the inlet of a waste heat boiler, including a fan, a cooling water jacket and a sealing casing. The cooling water jacket is provided with an arc-shaped opening opposite to the shape of the flue outlet. The left and right cooling water jackets are set on the outer periphery of the flue outlet. The outer ring of the casing is provided with a through hole, the through hole is connected to one end of the air-cooling branch pipe, and the other end of the air-cooling branch pipe is connected to the fan through the air-cooling main pipe.

The sealing casing is in the shape of a ring, and its ring section is in the shape of a "7", and one side of the opening faces the center of the flue outlet.

The flow rate of the cooling water jacket is: ≤10t/h, the pressure: 0.3MPa.

The flow rate of circulating water in the cooling water jacket is 0.7-1m/s, and the temperature is less than 20°C.

The middle ring plate of the sealing case is set on the straight section of the flue outlet, and the middle ring plate is clamped between the two side plates of the sealing case.

The utility model is composed of a cooling water jacket, a sealed casing and a multi-point evenly distributed secondary air system. In consideration of the frequently rotating structure of the rotary anode furnace and the large fluctuating flue gas performance, a multi-point uniformly distributed secondary air system is added to form a certain positive pressure environment inside the sealed casing while ensuring the solution to the expansion and sealing. , to prevent the leakage of smoke. The secondary air is arranged at the flue gas inlet of the waste heat boiler, which is more conducive to the full combustion of unburned fuel and heat exchange in the furnace of the waste heat boiler; at the same time, the secondary air cools the flue of the furnace mouth of the smelting furnace, effectively It reduces the corrosion and wear of the flue gas caused by the high-temperature flue gas, and prolongs the service life. And the manufacture is simple, the structure is safe, energy-saving and environment-friendly.

Description of drawings

Fig. 1 is the schematic diagram of positive pressure cooling air seal device of the present utility model;

Fig. 2 is a schematic diagram of the cross-sectional structure of A-A in Fig. 1;

Fig. 3 is the schematic diagram of the sealing case of the present utility model;

Fig. 4 is a schematic diagram of a cross-sectional structure along B-B in Fig. 3;

Fig. 5 is a partially enlarged schematic diagram of place C in Fig. 4;

In the figure: 1-fan, 2-air-cooled main pipe, 3-cooling water jacket, 4-return pipe, 5-water supply pipe, 6-sealing cover, 61. middle ring plate, 62. side plate, 7-flue outlet , 8-air-cooled branch pipe.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further. Referring to Figures 1 to 5, a high-efficiency mixed positive pressure cooling air seal device at the inlet of a waste heat boiler includes a fan 1, a cooling water jacket 3 and a sealing casing 6. The cooling water jacket 3 is divided into left and right parts, and the upper part is connected to There is a return pipe 4, and a water supply pipe 5 is connected below; the left and right cooling water jackets 3 are oppositely provided with arc-shaped openings, which match the shape of the flue outlet 7, and the left and right cooling water jackets 3 are set on the outer periphery of the flue outlet 7 to cool The outside of the connection between the water jacket 3 and the flue outlet 7 is fitted with a sealing case 6, the outer ring of the sealing case 6 is provided with a through hole, the through hole is connected to one end of the air-cooled branch pipe 8, and the other end of the air-cooled branch pipe 8 passes through the air The cold main pipe 2 is connected to the fan 1. The sealing case 6 is annular, and its annular section is in the shape of "7", and one side of the opening faces the center of the flue outlet. The flow rate of the cooling water jacket 3 is: ≤10t/h, and the pressure: 0.3MPa. The flow rate of circulating water in the cooling water jacket 3 is 0.7-1 m/s, and the temperature is less than 20°C. The middle ring plate 61 of the sealing case 6 is set on the straight section of the flue outlet 7 , and the middle ring plate 61 is sandwiched between the two side plates 62 of the sealing case 6 .

Embodiment: In the example diagram shown in FIG. 1 , the fan 1 provides the required oxygen for the secondary combustion of the unburned fuel in the flue gas. The air volume can be adjusted according to the difference between the oxygen demand in the oxidation period and the reduction period. The multi-point evenly distributed secondary air system is a multi-point evenly distributed secondary air duct, which supplies air evenly at the same time, and the diameter of the air duct is DN100.

The air-cooled main pipe 2 is made of welded 4mm thick steel plates. The cross-sectional size is determined according to the air volume of the fan 1 and the wind speed in the pipe. The wind speed inside the air-cooled main pipe 2 is generally 3-5m/s. The secondary air enters the labyrinth sealed casing 6 through the air-cooled main pipe 2 and the air-cooled branch pipes 8 evenly distributed on the outer periphery of the sealed casing 6 (see Figure 5: its structure consists of the middle ring plate 61 and the side plates 62 on both sides of the middle ring plate 61 composition). At this time, the sealed casing 6 becomes a pressure equalizing box, and the secondary air forms a positive pressure in the sealed casing 6, which effectively prevents the leakage of high-temperature flue gas. The lower temperature secondary air is blown into the secondary combustion chamber of the waste heat boiler along the flue outlet of the smelting furnace, which not only provides oxygen for the incompletely combusted fuel, but also protects the metal shell of the flue outlet 7 of the smelting furnace. The cooling water jacket is divided into about two pieces, which are welded by ordinary steel plates, and a group of cooling circulating water supply pipes 5 and cooling circulating water return pipes 4 are arranged respectively. The cooling circulating water is connected in parallel to the cooling water system of the smelting furnace body, and is recycled after passing through the cooling tower. Cooling water jacket 3 flow: ≤10t/h, pressure: 0.3MPa. The cooling circulating water supply pipe 5 and the return water pipe 4 of the cooling water jacket 3 have diameters of DN50, the flow rate of the cooling circulating water is controlled at 0.7-1m/s, and the temperature rise is controlled below 20°C. The cooling water jacket of the utility model is composed of left and right parts, which is convenient for maintenance and replacement. The sealed casing is welded by stainless steel plates and fixed on the cooling water jacket. Holes are evenly opened at multiple points around the sealed casing to connect to the secondary air-cooled branch pipe.

In the example diagram shown in Figure 2, the labyrinth-type sealed casing 6 is welded by high-temperature-resistant stainless steel plates, and the middle annular steel plate is sleeved on the straight section 7 of the flue outlet of the smelting furnace, and must not be welded with the flue and the sealed casing. It is convenient for the rotary anode furnace to rotate freely.

Claims (5)

1. A high-efficiency mixed positive pressure cooling air seal device at the inlet of a waste heat boiler, including a fan, a cooling water jacket and a sealing casing, characterized in that the cooling water jacket is divided into two parts, the upper part is connected with a return pipe, and the lower part The water supply pipe is connected; the left and right cooling water jackets are provided with arc-shaped openings opposite to each other, and the arc-shaped openings match the shape of the flue outlet. The left and right cooling water jackets are set on the outer periphery of the flue outlet. There is a sealed casing, the outer ring of the sealed casing is provided with a through hole, the through hole is connected to one end of the air-cooled branch pipe, and the other end of the air-cooled branch pipe is connected to the fan through the air-cooled main pipe. 2. A high-efficiency mixed positive pressure cooling air seal device for waste heat boiler inlet according to claim 1, characterized in that: the sealing casing is annular, and its annular cross-section is in the shape of "7", and one of the openings is Side towards the center of the flue outlet. 3. The high-efficiency mixed positive pressure cooling air seal device at the inlet of the waste heat boiler according to claim 1, characterized in that: the flow rate of the cooling water jacket is ≤10t/h, and the pressure is 0.3MPa. 4. The high-efficiency mixed positive pressure cooling air seal device at the inlet of the waste heat boiler according to claim 1, characterized in that: the flow rate of circulating water in the cooling water jacket is 0.7-1m/s, and the temperature is less than 20°C. 5. A high-efficiency mixed positive pressure cooling air seal device for waste heat boiler inlet according to claim 2, characterized in that: the middle ring plate of the sealing case is set on the straight section of the flue outlet, and the middle ring plate is clamped Seal between the two side plates of the casing.