阅读说明：本技术 一种防腐隔热碱炉黑液喷枪 (Anticorrosive heat-insulating alkali furnace black liquor spray gun ) 是由 江国春 朱明明 赵静 于 2021-03-26 设计创作，主要内容包括：本发明公开了一种防腐隔热碱炉黑液喷枪,包括两端为直段中间带有弯头的导流管,导流管后端通过第一角焊缝与快速接头连接；导流管前端设有反射板,反射板通过第二角焊缝与导流管呈特定角度装配连接,反射板为镍基材料制造,导流管为耐高温腐蚀不锈钢材料制造,内设一层纯镍或镍基合金内衬并以胀接方式连接,或采用一种耐高温腐蚀不锈钢材料与纯镍或镍基合金材料做成的复合管作为导流管。本发明可以大幅度降低黑液喷枪温度,减缓黑液喷枪的管内腐蚀速度,提高黑液喷枪外表面抗高温腐蚀的能力,大幅度提高黑液喷枪的使用寿命,提高碱炉效率,减少换枪次数。(The invention discloses an anticorrosive heat-insulating alkali furnace black liquor spray gun which comprises a flow guide pipe, wherein two ends of the flow guide pipe are straight sections, and the middle of the flow guide pipe is provided with an elbow; the front end of the flow guide pipe is provided with a reflecting plate, the reflecting plate is assembled and connected with the flow guide pipe at a specific angle through a second fillet weld, the reflecting plate is made of a nickel-based material, the flow guide pipe is made of a high-temperature corrosion resistant stainless steel material, a layer of pure nickel or nickel-based alloy lining is arranged in the flow guide pipe and connected in an expansion connection mode, or a composite pipe made of the high-temperature corrosion resistant stainless steel material and the pure nickel or nickel-based alloy material is used as the flow guide pipe. The invention can greatly reduce the temperature of the black liquor spray gun, slow down the corrosion speed in the tube of the black liquor spray gun, improve the high-temperature corrosion resistance of the outer surface of the black liquor spray gun, greatly prolong the service life of the black liquor spray gun, improve the efficiency of the alkali furnace and reduce the gun changing times.)

1. An anticorrosive heat-insulating alkali furnace black liquor spray gun comprises a flow guide pipe (5) with straight sections at two ends and an elbow in the middle, wherein the rear end of the flow guide pipe (5) is connected with a quick connector (6) through a first fillet weld (7);

the method is characterized in that: the honeycomb duct is characterized in that a reflecting plate (1) is arranged at the front end of the honeycomb duct (5), the reflecting plate (1) is in assembly connection with the honeycomb duct (5) at a specific angle through a second fillet weld (3), the reflecting plate (1) is made of a nickel-based material, the honeycomb duct (5) is made of a high-temperature corrosion resistant stainless steel material, a layer of pure nickel or nickel-based alloy lining (12) is arranged in the honeycomb duct and connected in an expansion connection mode, or a composite pipe made of the high-temperature corrosion resistant stainless steel material and the pure nickel or nickel-based alloy material is adopted as the honeycomb duct (5).

2. The black liquor spray gun of an anti-corrosion and heat-insulation alkali furnace according to claim 1, characterized in that: be equipped with shower nozzle (2) between honeycomb duct (5) and reflecting plate (1), shower nozzle (2) through butt joint circumferential weld (4) set up in honeycomb duct (5) front end, shower nozzle (2) front end passes through second fillet weld (3) with reflecting plate (1) are specific angle assembly connection, shower nozzle (2) are nickel base material manufacturing.

3. The black liquor spray gun of an anti-corrosion and heat-insulation alkali furnace according to claim 1, characterized in that: and a pure nickel or nickel-based alloy layer (9) is deposited on the outer surface of the draft tube (5).

4. The black liquor spray gun of an anti-corrosion and heat-insulation alkali furnace according to claim 1, characterized in that: the outer surface of the draft tube (5) adopts high-temperature thermal barrier coating (8), high-temperature-resistant heat insulation material (13) and pure nickel or nickel-based alloy strip (10), and the pure nickel or nickel-based alloy strip can be independently adopted or alternatively adopted.

5. The anti-corrosion and heat-insulation alkali furnace black liquor spray gun according to claim 4, characterized in that: the outer surface of the draft tube (5) is coated with a layer of high-temperature thermal barrier coating (8), the outer surface of the high-temperature thermal barrier coating (8) is coated or wound with a high-temperature-resistant thermal insulation material (13), the outer surface of the high-temperature-resistant thermal insulation material (13) is coated with another layer of the high-temperature thermal barrier coating (8), the outermost layer is wound with a pure nickel or nickel-based alloy strip (10), and then the pure nickel or nickel-based alloy strip is fixed by a pure nickel or nickel-based.

6. The black liquor spray gun of an anti-corrosion and heat-insulation alkali furnace according to claim 2, characterized in that: and a pure nickel or nickel-based alloy layer (9) is deposited on the outer surfaces of the flow guide pipe (5) and the spray head (2).

7. The black liquor spray gun of an anti-corrosion and heat-insulation alkali furnace according to claim 2, characterized in that: the outer surfaces of the flow guide pipe (5) and the spray head (2) adopt high-temperature thermal barrier coating (8), high-temperature-resistant heat insulation materials (13) and pure nickel or nickel-based alloy strips (10), and the high-temperature thermal barrier coating can be adopted independently or alternatively.

8. The black liquor spray gun of an anti-corrosion and heat-insulation alkali furnace according to claim 7, characterized in that: the outer surfaces of the flow guide pipe (5) and the spray nozzle (2) are coated with a layer of high-temperature thermal barrier coating (8), the outer surface of the high-temperature thermal barrier coating (8) is coated or wound with a high-temperature-resistant heat insulation material (13), the outer surface of the high-temperature-resistant heat insulation material (13) is coated with another layer of high-temperature thermal barrier coating (8), the outermost layer is wound with a pure nickel or nickel-based alloy strip (10), and then the pure nickel or nickel-based alloy strip is fixed by a pure nickel or nickel.

9. The anti-corrosion and heat-insulation alkali furnace black liquor spray gun according to claim 5 or 8, characterized in that: the high-temperature-resistant heat insulation material (13) is an alumina fiber tape or a ceramic bead coating, the alumina fiber tape or the ceramic fiber tape is wound on the outer surface of the high-temperature thermal barrier coating (8) of the outer layer, and the ceramic bead coating is coated on the outer surface of the high-temperature thermal barrier coating (8) of the outer layer.

10. The black liquor spray gun of an anti-corrosion and heat-insulation alkali furnace according to claim 1, characterized in that: the quick connector (6) is made of stainless steel materials and is provided with a screwing plane (6 a), and the other end of the quick connector is provided with a connecting thread (6 b).

Technical Field

The invention belongs to the technical field of combustion devices of alkali recovery boilers, and particularly relates to an anticorrosive heat-insulating alkali furnace black liquor spray gun.

Background

In the alkaline pulping and papermaking industry, the pollution of the papermaking black liquor is the most serious, and the alkaline recovery technology is the most effective method for treating the papermaking black liquor at present. The papermaking black liquor is concentrated and then sprayed into an alkali recovery boiler through a black liquor spray gun for further drying and combustion.

The black liquor spray gun is usually made of 310s or 2205 stainless steel, but because the black liquor spray gun works in a high-temperature hearth at 1000 ℃, the black liquor contains high-concentration alkaline corrosion components and high-concentration chloride ions, the black liquor spray gun is corroded by external high temperature and corrosive atmosphere in the furnace, the interior of the black liquor spray gun is corroded by strong alkaline corrosion of the black liquor and the high-concentration chloride ions, the stainless steel black liquor spray gun is easy to rapidly lose efficacy, particularly, the black liquor spray gun is most easily corroded, thinned, perforated and cracked and falls off within the range of 150mm of a nozzle, the service life of the black liquor spray gun is several days, a new gun needs to be replaced for a month, the black liquor spray gun needs to be replaced frequently, the boiler efficiency is influenced.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects and shortcomings of the prior art, and provide the anti-corrosion heat-insulation alkali furnace black liquor spray gun, so that the service life of the black liquor spray gun is prolonged.

In order to achieve the purpose, the invention adopts the following technical scheme:

an anticorrosive heat-insulating alkali furnace black liquor spray gun comprises a flow guide pipe with straight sections at two ends and an elbow in the middle, wherein the rear end of the flow guide pipe is connected with a quick connector through a first fillet weld;

the front end of the flow guide pipe is provided with a reflecting plate, the reflecting plate is assembled and connected with the flow guide pipe at a specific angle through a second fillet weld, the reflecting plate is made of a nickel-based material, the flow guide pipe is made of a high-temperature corrosion resistant stainless steel material, a layer of pure nickel or nickel-based alloy lining is arranged in the flow guide pipe and connected in an expansion connection mode, or a composite pipe made of the high-temperature corrosion resistant stainless steel material and the pure nickel or nickel-based alloy material is used as the flow guide pipe.

Furthermore, the front end of the flow guide pipe can be directly used as a spray head, the spray head can also be arranged between the flow guide pipe and the reflecting plate, the spray head is arranged at the front end of the flow guide pipe through a butt joint circular seam, the front end of the spray head is assembled and connected with the reflecting plate at a specific angle through the second fillet weld, and the spray head is made of a nickel-based material.

Furthermore, a pure nickel or nickel-based alloy layer is deposited on the outer surface of the flow guide pipe or the flow guide pipe and the spray head in a surfacing mode.

Furthermore, the outer surfaces of the flow guide pipe or the flow guide pipe and the spray head are made of high-temperature thermal barrier coating, high-temperature-resistant thermal insulation materials and pure nickel or nickel-based alloy strips, and the high-temperature thermal barrier coating, the high-temperature-resistant thermal insulation materials and the pure nickel or nickel-based alloy strips can be independently adopted or alternatively adopted.

Furthermore, the outer surfaces of the flow guide pipe or the flow guide pipe and the spray nozzle are coated with a layer of high-temperature thermal barrier coating, the outer surface of the high-temperature thermal barrier coating is coated or wound with a high-temperature-resistant thermal insulation material, the outer surface of the high-temperature-resistant thermal insulation material is coated with another layer of high-temperature thermal barrier coating, the outermost layer of the high-temperature-resistant thermal insulation material is wound with a pure nickel or nickel-based alloy strip, and then the pure.

Furthermore, the high-temperature-resistant heat-insulating material is an alumina fiber tape or a ceramic bead coating, the alumina fiber tape or the ceramic fiber tape is wound on the outer surface of the high-temperature thermal barrier coating of the outer layer, and the ceramic bead coating is coated on the outer surface of the high-temperature thermal barrier coating of the outer layer.

Furthermore, the quick connector is made of stainless steel materials and is provided with a tightening plane, and the other end of the quick connector is provided with connecting threads.

The invention has the beneficial effects that:

1. the reflecting plate and the spray head of the black liquor spray gun are made of nickel-based materials, so that the failure speed near the nozzle of the black liquor spray gun can be effectively slowed down, and the service life of the black liquor spray gun is effectively prolonged;

2. the black liquor spray gun is manufactured by adopting a pure nickel or nickel base alloy lining or a composite pipe made of high temperature corrosion resistant stainless steel materials and pure nickel or nickel base alloy materials as a flow guide pipe in the flow guide pipe of the black liquor spray gun, so that the corrosion resistance in the black liquor spray gun pipe can be greatly improved, and the manufacturing cost of the black liquor spray gun can be controlled;

3. the outer surface of the black liquor spray gun adopts high-temperature thermal barrier coating, an alumina fiber belt or a ceramic fiber belt winding and a pure nickel or nickel-based alloy belt winding process, so that high-temperature oxidation can be effectively prevented, corrosive media in the furnace can be isolated, and the high-temperature corrosion resistance of the outer surface of the black liquor spray gun is improved;

4. the outer surface of the black liquor spray gun is coated with high-temperature thermal barrier coating, ceramic microsphere coating and pure nickel or nickel-based alloy strip winding process, so that the temperature of the black liquor spray gun can be greatly reduced, the corrosion speed in the tube of the black liquor spray gun can be greatly slowed down, and the high-temperature corrosion resistance of the outer surface of the black liquor spray gun can be improved;

5. the measures greatly prolong the service life of the black liquor spray gun, improve the efficiency of the alkali furnace, reduce the gun replacement times and bring considerable economic benefits.

Drawings

FIG. 1 is a schematic structural view of one embodiment of the black liquor spray gun of the present invention;

FIG. 2 is a cross-sectional view of an embodiment of a draft tube of the black liquor lance of the present invention;

FIG. 3 is a cross-sectional view of an embodiment of a draft tube of the black liquor lance of the present invention;

fig. 4 is a cross-sectional view of one embodiment of a draft tube of the black liquor lance of the present invention;

wherein: 1. a reflective plate; 2. A spray head; 3. a second fillet weld; 4. Butt-joint circular seams; 5. a flow guide pipe; 6. A quick coupling; 6a, tightening the plane; 6b, connecting threads; 7. a first fillet weld; 8. High temperature thermal barrier coating; 9. a pure nickel or nickel-based alloy layer; 10. pure nickel or nickel-based alloy strip; 11. a pure nickel or nickel-based alloy hose clamp; 12. a pure nickel or nickel-based alloy liner; 13. high temperature resistant heat insulating material.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific embodiments. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims.

Example 1:

as shown in figure 1-2, the corrosion-resistant and heat-insulating alkali furnace black liquor spray gun comprises a flow guide pipe 5 with straight sections at two ends and an elbow in the middle, and the rear end of the flow guide pipe 5 is connected with a quick connector 6 through a first fillet weld 7. The quick coupling 6 is made of stainless steel material and has a tightening plane 6a and a connecting thread 6b at the other end.

The front end of the draft tube 5 is used as a nozzle, a reflecting plate 1 is arranged on the front section of the draft tube 5, the reflecting plate 1 is assembled and connected with the draft tube 5 through a second fillet weld 3 at a specific angle, the reflecting plate 1 is made of a nickel-based material, the draft tube 5 is made of a high-temperature corrosion resistant stainless steel material, a pure nickel or nickel-based alloy lining 12 is arranged in the draft tube 5, and the pure nickel or nickel-based alloy lining 12 is connected with the draft tube 5 in an expansion connection mode to eliminate gaps. Or a composite pipe made of a high-temperature corrosion resistant stainless steel material and a pure nickel or nickel-based alloy material is used as the draft tube 5. Can improve the black liquor corrosion resistance in the black liquor spray gun pipe.

Example 2:

an anticorrosive heat-insulating alkali furnace black liquor spray gun comprises a flow guide pipe 5 with straight sections at two ends and an elbow in the middle, wherein the rear end of the flow guide pipe 5 is connected with a quick connector 6 through a first fillet weld 7. The quick coupling 6 is made of stainless steel material and has a tightening plane 6a and a connecting thread 6b at the other end.

Be equipped with shower nozzle 2 between honeycomb duct 5 and reflecting plate 1, shower nozzle 2 sets up in honeycomb duct 5 front end through butt joint circumferential weld 4, and shower nozzle 2 front end is specific angle assembly connection through second fillet weld 3 and reflecting plate 1. The reflecting plate 1 and the spray head 2 are made of nickel-based materials, the draft tube 5 is made of high-temperature corrosion resistant stainless steel materials, a layer of pure nickel or nickel-based alloy lining 12 is arranged in the draft tube, and the pure nickel or nickel-based alloy lining 12 and the draft tube 5 are connected in an expansion connection mode to eliminate gaps. Or a composite pipe made of a high-temperature corrosion resistant stainless steel material and a pure nickel or nickel-based alloy material is used as the draft tube 5. Can improve the black liquor corrosion resistance in the black liquor spray gun pipe.

Example 3:

as shown in fig. 4, a pure nickel or nickel-based alloy layer 9 is deposited on the outer surface of the draft tube 5, and the remaining characteristics are completely the same as those of example 1. The black liquor corrosion resistance in the black liquor spray gun pipe and outside the gun pipe is improved.

Example 4:

as shown in fig. 3, the outer surface of the draft tube 5 is coated with a layer of high temperature thermal barrier coating 8, the outer surface of the high temperature thermal barrier coating 8 is coated or wound with a high temperature resistant thermal insulation material 13, the outer surface of the high temperature resistant thermal insulation material 13 is coated with another layer of high temperature thermal barrier coating 8, the outermost layer is wound with a pure nickel or nickel-based alloy strip 10, and then the pure nickel or nickel-based alloy strip is fixed by a pure nickel or nickel-based.

Wherein, the high temperature resistant heat insulation material 13 is an alumina fiber tape or a ceramic bead coating, the alumina fiber tape or the ceramic fiber tape is wound on the outer surface of the outer layer high temperature thermal barrier coating 8, and the ceramic bead coating is coated on the outer surface of the outer layer high temperature thermal barrier coating 8. The remaining features are exactly the same as in example 1.

The high-temperature thermal barrier coating 8 is a ceramic coating which is deposited on the surface of high-temperature resistant metal or superalloy to form a film, isolates oxygen and a corrosive medium, and is mainly used for resisting high-temperature oxidation of metal. The high-temperature thermal barrier coating 8 can resist the high temperature of more than 1000 ℃, so that the outer wall of the black liquor spray gun is prevented from being oxidized at high temperature and the corrosion of high-temperature corrosive media in the furnace to the outer wall of the black liquor spray gun is isolated, and the service life of the black liquor spray gun can be greatly prolonged.

The alumina fiber belt or the ceramic fiber belt has certain heat insulation effect, so that the surface temperature of the black liquor spray gun is reduced, the corrosion speed in the black liquor spray gun is slowed down, and the capabilities of resisting high-temperature oxidation of the outer wall of the black liquor spray gun and isolating corrosive media in the furnace can be improved by combining coating of the high-temperature thermal barrier coating 8 and winding of the pure nickel or nickel-based alloy belt 10 on the outermost layer.

When the coating thickness of the ceramic microsphere coating reaches 6mm, the ambient temperature of the black liquor spray gun can be reduced from 1000 ℃ to 200 ℃ on the surface of the black liquor spray gun, the corrosion speed in the black liquor spray gun can be greatly slowed down by greatly reducing the surface temperature of the black liquor spray gun, and the capabilities of high-temperature oxidation resistance of the outer wall of the black liquor spray gun and medium corrosion resistance in an isolation furnace can be improved by combining coating of the high-temperature thermal barrier coating 8 and winding of the pure nickel or nickel-based alloy strip 10 on the outermost layer.

The honeycomb duct 5 is externally provided with a plurality of layers, when the black liquor spray gun works in a high-temperature hearth at 1000 ℃, if one layer falls off, the other layer is also arranged, the protection is more durable, the service life of the black liquor spray gun is prolonged, if only one layer is made, the black liquor spray gun is very thick, and the black liquor spray gun easily falls off during thermal expansion.

Example 5:

the outer surfaces of the flow guide pipe 5 and the spray head 2 are overlaid with a pure nickel or nickel-based alloy layer 9, and the rest characteristics are completely the same as those of the embodiment 2.

Example 6:

the outer surfaces of the flow guide pipe 5 and the spray head 2 are coated with a layer of high-temperature thermal barrier coating 8, the outer surface of the high-temperature thermal barrier coating 8 is coated or wound with a high-temperature resistant heat insulation material 13, the outer surface of the high-temperature resistant heat insulation material 13 is coated with another layer of high-temperature thermal barrier coating 8, the outermost layer is wound with a pure nickel or nickel-based alloy strip 10, and then the pure nickel or nickel-based alloy strip is fixed by a.

Wherein, the high temperature resistant heat insulation material 13 is an alumina fiber tape or a ceramic bead coating, the alumina fiber tape or the ceramic fiber tape is wound on the outer surface of the outer layer high temperature thermal barrier coating 8, and the ceramic bead coating is coated on the outer surface of the outer layer high temperature thermal barrier coating 8. The remaining features are exactly the same as in example 2.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.