CN205368275U - Novel blast orifice oxygen nozzle - Google Patents

Abstract

A new type of tuyere oxygen burner, including injection system and cooling system, the injection system includes the main nozzle, the front end of the main nozzle is the head of the burner, the cooling system includes the cooling water inlet pipe and the cooling system around the main nozzle The water coil is characterized in that a water jacket is arranged on the head of the burner, and there is a water collecting chamber in the water jacket, the water inlet of the water collecting chamber is connected with the cooling water inlet pipe, and the water outlet is connected with the cooling water coil. The fire-facing surface of the water jacket is provided with a protective cover, and the ends of the water jacket and the protective cover have holes for the front end of the main nozzle to pass through. The utility model adds a water jacket to the head of the burner, so that the whole The burner head can be cooled, and a protective high-temperature and corrosion-resistant material with low thermal conductivity is added outside the water jacket, so that the burner head can be completely cooled with the corrosive high temperature in the furnace. Gas isolation can effectively prolong the service life of the oxygen burner at the tuyeres and reduce repair costs.

Description

A New Type Oxygen Burner with Tuyeres

technical field

The utility model relates to a new type of tuyere oxygen burner, which is used in a BGL crushed coal slag pressurized gasification furnace, and can also be used as a burner in high-temperature environments in industrial devices in industrial fields such as energy, environmental protection, metallurgy, petroleum, and chemical industry. Jetting device.

Background technique

BGL pulverized coal slag gasification technology belongs to the gasification furnace with liquid slag discharge. Compared with the coal chemical technology commonly used in China, the biggest feature of this technology is that the raw coal used is lignite (low-quality coal), and about 80% of our country The coal resources are all low-quality coal such as lignite, which is in line with my country's coal deep processing industry policy and is also the main trend of my country's future coal chemical industry development. Several sets of this device have been in operation in China. According to domestic operating experience, the average service life of the tuyere oxygen burner is about 90 days, and its regular maintenance and replacement has become one of the main reasons for the frequent shutdown of the BGL gasifier, seriously affecting the economic benefits of the enterprise.

In the BGL crushed coal slag gasifier, lignite (low-quality coal) enters the gasifier intermittently from the top through the coal lock, and gasification agent steam and oxygen are injected into the furnace at the same angle from the oxygen burner at the tuyere at the lower part of the gasifier. , forming an oxygen-rich combustion zone at the center. By controlling the oxygen concentration of the gasification agent, the reaction temperature in the furnace is adjusted to reach the temperature above the ash melting point, so that the ash slag enters the molten slag pool after it becomes molten, and then is intermittently discharged into the quenching chamber by connecting the short joint (combustion ring), and finally from The slag locks are intermittently discharged into the slag flushing ditch.

Usually, the BGL pulverized coal slag gasifier has six tuyere oxygen burners, which are evenly arranged and oppositely installed at a certain horizontal angle on the side wall of the gasifier and penetrate into the slag pool in the furnace. The tuyere oxygen burner is designed with a single-channel shrinking diameter structure. It is cooled by a cooling water coil and a cast copper structure. The high temperature heat in the furnace on the surface of the burner is taken away by the good thermal conductivity of the copper material. In the existing structural design, the cooling water cannot cool the head of the burner well, and the head is in a high temperature environment of about 1500 °C near the slag pool in the furnace, so the head is often ablated due to high temperature, and the structure size of the mouth channel Deformation seriously affects the short service life and performance parameters of the burner, and the maintenance of copper materials is troublesome.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a new type of oxygen burner with tuyeres. A water jacket is added to the head of the burner so that the entire head of the burner can be cooled, and the water jacket A high-temperature and corrosion-resistant material with low thermal conductivity is added for protection on the outside, so that the burner head is isolated from the corrosive high-temperature gas in the furnace under the condition of complete cooling, which can effectively prolong the use of the oxygen burner at the tuyeres life and reduce repair costs.

In order to achieve the above object, the technical solution adopted by the utility model is:

A new type of tuyere oxygen burner, including an injection system 1 and a cooling system 2, the injection system 1 includes a main nozzle 6, the front end of the main nozzle 6 is the burner head, and the cooling system 2 includes a cooling water inlet pipe 9 and a surrounding The cooling water coil 12 on the main spray pipe 6 is characterized in that a water jacket 10 is arranged on the head of the burner, and a water collection chamber 101 is arranged in the water jacket 10, and the water inlet of the water collection chamber 101 is connected with the cooling water inlet. The water pipe 9 communicates, and the water outlet communicates with the cooling water coil 12 .

A water separator 102 and a water barrier 103 are arranged in the water collecting chamber 101 .

The cooling system 2 includes a tubular cast copper body 14, a part of the cooling water coil 12 and its coiled main spray pipe 6 are located in the cast copper body 14, and the water jacket 10 is connected to the front end of the cast copper body 14, and collectively The connection surface between the water cavity 101 and the cast copper body 14 is provided with a fin structure to enhance heat conduction and bonding strength.

The water jacket 10 and the water separator 102 and the water barrier 103 inside are nickel-based alloy parts.

The water barrier 103 is made of copper.

The fire-facing surface of the water jacket 10 is provided with a protective cover 11, and the ends of the water jacket 10 and the protective cover 11 all have holes for the front end of the main nozzle 6 to pass through.

The protective cover 11 is a non-metallic ceramic part, fixed on the water jacket 10 by a set of countersunk rivets, and the countersunk holes where the countersunk rivets are located are sealed with refractory materials.

The protective cover 11 is a nickel-based alloy or a cobalt-based alloy, which is surfacing welded on the fire-facing surface of the water jacket 10 .

The cooling water coil 12 is a copper tube coil or a pure nickel tube coil.

The tail end of the main nozzle 6 is provided with an oxygen vapor flange 3 .

Compared with the prior art, the beneficial effects of the utility model are:

1. In view of the fact that the original pure coil cooling structure cannot be extended close to the end face, the outlet of the burner head, that is, the main nozzle, is effectively cooled and protected. The water jacket structure is adopted at the burner head, and the cooling water and the The heat transfer on the end face of the burner head can effectively change the insufficient heat transfer of the burner head, effectively protect the outlet of the main nozzle and the end face of the burner head, and slow down its deformation due to excessive temperature;

2. On the basis of active cooling, a passive protective cover is installed on the end surface of the water jacket of the burner head, and the high temperature resistance, oxidation resistance and corrosion resistance of the protective cover are used to block the end surface of the burner head and the outlet of the main nozzle. Direct contact with high temperature, oxidizing atmosphere and corrosive atmosphere in the furnace can greatly slow down the occurrence of high temperature ablation. In the process of starting and stopping, it can effectively prevent the damage to the burner head caused by tempering.

3. The utility model starts from two aspects of active cooling and passive defense, effectively protects the end face of the oxygen burner at the tuyere and the outlet of the main nozzle, generally prolongs the service life by 1.5 to 2.0 times, and greatly reduces the difficult maintenance of cast copper Body maintenance.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a sectional view of the cast copper body, the water jacket and the protective cover in Fig. 1 .

detailed description

The implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and examples.

The principle of the utility model is to increase the heat exchange area between the cooling water and the burner head after the cooling water enters the head water jacket, and extend The dual function of the cooling time of the cooling water in the burner head can quickly take away the high temperature of the head, so that the burner head can be well cooled, and the burner head can be isolated from the high-temperature corrosive gas in the furnace to ensure that the burner The material used in the nozzle head will not be damaged by high temperature and oxidizing and corrosive environment, so as to provide a tuyere oxygen burner with longer life and more stable operation.

As shown in Figure 1, Figure 2 and Figure 3, the technical solution is as follows:

1. Oxygen burner structure at tuyere

The tuyere oxygen burner is mainly composed of an injection system 1 and a cooling system 2. The injection system 1 includes a main nozzle 6 connected with a mixed gas of oxygen and steam. An oxygen vapor flange 3, and a detection hole flange 4 and a mounting flange 5 for connecting detection equipment are installed near the tail end. The cooling system 2 includes a tubular cast copper body 14, a cooling water coil 12 and a cooling water inlet pipe 9, the cooling water coil 12 is located in the cast copper body 14 as a whole, and a cooling water inlet flange 7 is installed at the inlet end of the cooling water inlet pipe 9 , the outlet end of the cooling water coil 12 is connected with the cooling water outlet pipe 13, and the outlet end of the cooling water outlet pipe 13 is installed with the cooling water outlet flange 8. The front end (ie the thin end) of the main nozzle 6 passes through the cast copper body 14 .

2. Cooling system structure

Aiming at the high-efficiency cooling and corrosion-resistant protection of the head of the tuyere oxygen burner, the utility model adds a water jacket 10 on the head of the burner, which can increase the effective heat exchange area of the burner head and prolong the cooling time, and A protective cover 11 is added for heat insulation, oxidation prevention and corrosion prevention.

Specifically, a water jacket 10 is arranged at the head of the burner, and a water collecting chamber 101 is arranged in the water collecting chamber 10. A water divider 102 and a water barrier 103 are arranged in the water collecting chamber 101. The water jacket 10 and its interior Both the water separator 102 and the water barrier 103 are nickel-based alloy parts with excellent thermal conductivity, high temperature resistance and corrosion resistance. The water barrier 103 can also be copper with excellent thermal conductivity. The water distributor 102 and the water separator 103 can make the water distribution even. The water inlet of the water collecting chamber 101 is connected with the cooling water inlet pipe 9 , and the water outlet is connected with the cooling water coil 12 . The cooling water coil 12 is a copper tube coil or a pure nickel tube coil.

The water jacket 10 is connected to the front end of the cast copper body 14 , and the connection surface of the water collecting chamber 101 and the cast copper body 14 is provided with a fin structure to enhance heat conduction and bonding strength.

The protective cover 11 can be a nickel-based alloy or a cobalt-based alloy with high temperature resistance, corrosion resistance and good thermal conductivity, and is surfacing welded on the fire-facing surface of the water jacket 10 . It can also be a non-metallic ceramic piece with low thermal conductivity, anti-oxidation and corrosion resistance, which is fixed on the water jacket 10 with a set of countersunk rivets, and the countersunk holes where the countersunk rivets are located are sealed with refractory materials. The ends of the water jacket 10 and the protective cover 11 all have holes for the front end of the main nozzle 6 to pass through.

The high-temperature and high-pressure oxygen and water vapor mixed gas enters the main nozzle 6 through the oxygen steam flange 3, and is sprayed into the furnace after passing through the necked main nozzle 6 to achieve the purpose of speeding up. The tail of the main nozzle 6 has a detection hole flange 4, It is used to connect the detection device for detecting the flame in the furnace.

At the same time, the high-pressure cooling water enters the cooling water inlet pipe 9 from the cooling water inlet flange 7, and the cooling water inlet pipe 9 is directly connected with the water jacket 10, and the cooling water enters the water collecting cavity 101 of the water jacket 10, and is discharged at the burner head. After the head end face is effectively cooled by the internal cycle, it enters the cooling water coil 12 located in the cast copper body 14 to cool the cast copper body 14 and the head, and then enters the cooling water outlet pipe 13 and flows into the cooling water outlet method Lan 8 leaves the tuyere oxygen burner. The fins on the end surface of the water collecting chamber 101 in contact with the cast copper body 14 can ensure that the water jacket 10 is closely combined with the cast copper body 14 and has good thermal conductivity. The protective cover 11 is installed on the fire-facing end face of the water jacket 10. There is a small hole in the middle of the protective cover 11 which is slightly larger than the diameter of the small end of the main nozzle 6, and the outlet end of the main nozzle 6 is flush with the end surface of the protective cover 11 or the main nozzle The tube is indented slightly. The material used for the protective cover 11 has the characteristics of low thermal conductivity, high temperature resistance, oxidation resistance and corrosion resistance, and has good thermal shock resistance.

Provide the specific embodiment of following design parameter according to above structure:

The cooling water inlet temperature is 40°C, the cooling water outlet temperature is 50°C, the cooling water flow rate is 3.2Nm ³ /h, the cooling water inlet pressure is 5.47MPa, and the service life can reach more than 180 days.

The length of the burner is 1850.0mm, the front cooling system (including cast copper body 14, water jacket 10, protective cover 11 and cooling water coil 12) is 720mm long and 180mm in diameter. The cooling water coil 12 is coiled by a copper tube. Install the inner side of flange 5 (the part extending into the furnace) 1200mm. The cooling water is sent into the water collection chamber 101 through the cooling water inlet pipe 9, and is evenly distributed to the water barrier 103 through the water separator 102, and exchanges heat with the end surface of the burner head to cool the burner head. After flowing out from the water jacket 10, it enters the cooling water coil 12 to exchange heat with the cast copper body 14 to remove the heat on the cast copper body 14, and the cast copper body 14 and the water jacket 10 are connected by a plurality of fins. Connection, the heat received by the head can also be taken away by the cooling water through the cast copper body 14. The cooling water flowing through the cooling water coil 12 flows out through the cooling water outlet pipe 13 and the cooling water outlet flange 8 . The protective cover 11 is made of non-metallic ceramic-based material and fixed on the water jacket through countersunk rivets, and the countersunk rivets are sealed with refractory materials to avoid deformation of the rivets due to direct contact with high temperature.

In summary, the core concept of this utility model is to add a water jacket 10 and a protective cover 11 at the end face of the burner head facing the fire, so that the cooling water can directly reach the end face of the burner head, and increase the distance between the cooling water and the burner head. The heat exchange area reasonably prolongs the residence time of the cooling water and optimizes the heat exchange effect of the end surface of the head. The additional protective cover 11 can effectively isolate the direct damage to the burner head caused by the high temperature, oxidizing atmosphere and corrosive atmosphere in the furnace, and at the same time prevent the oxygen vapor from diffusing to the surrounding of the burner head and coal A violent reaction occurs such that the burner head is directly exposed to the intense combustion reaction zone. Any implementation based on the idea of the utility model falls within the protection scope of the utility model.

Claims (10)

1. a Novel drum air port oxygen burner, including spraying system (1) and cooling system (2), spraying system (1) includes main jet pipe (6), the front end of main jet pipe (6) is burner head, cooling system (2) includes cooling water inlet pipe (9) and the cooling water coil (12) being wound on main jet pipe (6), it is characterized in that, water leg (10) is had in burner header arrangement, water leg (10) has collect cavity (101), collect cavity (101) water inlet connects with cooling water inlet pipe (9), outlet connects with cooling water coil (12).

2. Novel drum air port oxygen burner according to claim 1, it is characterised in that be provided with water knockout drum (102) and water-resisting piece (103) in described collect cavity (101).

3. Novel drum air port oxygen burner according to claim 2, it is characterized in that, described cooling system (2) includes the cast, copper body (14) of tubulose, a part for the main jet pipe (6) of cooling water coil (12) and its coiling is arranged in cast, copper body (14), water leg (10) is connected with the front end of cast, copper body (14), and is provided with the fin structure of reinforced heat conduction and bond strength on the joint face of collect cavity (101) and cast, copper body (14).

4. Novel drum air port oxygen burner according to claim 2, it is characterised in that water knockout drum (102) and the water-resisting piece (103) of described water leg (10) and inside thereof are nickel-base alloy part.

5. Novel drum air port oxygen burner according to claim 2, it is characterised in that described water-resisting piece (103) is red copper part.

6. Novel drum air port oxygen burner according to claim 1; it is characterized in that; the counter-fire face of described water leg (10) is provided with protective cover (11), and all there is the hole passed for main jet pipe (6) front end the end of water leg (10) and protective cover (11).

7. Novel drum air port oxygen burner according to claim 6; it is characterized in that; described protective cover (11) is nonmetallic ceramics part, uses one group of sunk head rivet to be fixed on water leg (10), and sunk head rivet place counterbore is with refractory material sealing.

8. Novel drum air port oxygen burner according to claim 6, it is characterised in that described protective cover (11) is nickel-base alloy part or cobalt-base alloys part, heap is welded in water leg (10) counter-fire face.

9. Novel drum air port oxygen burner according to claim 1, it is characterised in that described cooling water coil (12) is copper tube dish or pure nickel pipe dish.

10. Novel drum air port oxygen burner according to claim 1, it is characterised in that the tail end of described main jet pipe (6) arranges oxygen steam flange (3).