Protection device for cooling coil pipe of gasification furnace

Abstract

The utility model provides a protection device for a cooling coil of a gasification furnace, which comprises a channel formed by tightly coiling the cooling coil, and a protection cover is arranged on the inner wall of a quick-wear position of an opening of a tail coil of the cooling coil and has the functions of heat insulation and scour prevention. The cooling coil pipe has the advantages that the structural design is reasonable, the protective cover made of the high-temperature-resistant alloy material is coated on the easily-damaged surface of the cooling coil pipe, and high-heat and easily-worn materials are prevented from being in direct contact with a coil pipe base material, so that the service life of the cooling coil pipe is greatly prolonged, and the field use reaction is good.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling coils of coal chemical gasifiers, in particular to a protective device for cooling coils of gasifiers. Background Art

[0002] The operating principle of the gasifier is: water-coal slurry or dry coal powder is pressurized and mixed with oxygen through a nozzle and then sprayed into the gasifier for reaction to generate synthetic raw coal gas of Co+H2. The furnace operating temperature is about 1300℃.

[0003] Due to the high temperature in the furnace and the fact that the operating medium is easily abraded materials such as coal powder particles, the key parts of this type of cooling protection coil are prone to ablation and wear during use. With the continuous improvement of the customer's on-site operation technology level, the stable operation cycle of the gasifier is getting longer and longer, so higher requirements are put forward for the operation cycle of the above-mentioned cooling protection coils that are prone to ablation and wear. Take the slag outlet coil of the Shenning furnace of the National Energy Ningmei Group as an example. Figure 1 As shown in the figure, the lower slag outlet protection coil is installed at the lower end of the slag outlet of Shenning furnace. The hot slag in the reaction chamber of the gasifier is discharged into the quenching chamber through it. Figure 2 As shown in the figure, the lower 4-5 coils are very susceptible to erosion by coal cinders, and often leak after 150-200 days of use. Anchor nails are specially set when designing the coil surface, and high-temperature resistant ceramic castables are used for protection before use, but the use is still unsatisfactory, resulting in frequent replacements and a waste of time, material and financial resources. Summary of the invention

[0004] The utility model aims to provide a protective device for a gasifier cooling coil which has a reasonable structural design, avoids direct contact between high-heat substances and coil base materials, and prolongs service life.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0006] A protective device for a gasifier cooling coil comprises a channel formed by tightly winding the cooling coil, wherein the inner wall of the cooling coil at the end coil opening is covered with a protective cover made of a high temperature resistant alloy, and the protective cover is located at a portion of the cooling coil that is prone to ablation and wear.

[0007] Furthermore, the protective cover is formed by splicing a plurality of sheet structures, and each sheet structure is attached to the tube wall of the cooling coil.

[0008] Furthermore, the protective cover is formed by welding sheet metal according to the actual shape of the cooling coil.

[0009] Furthermore, the protective cover is made of two or more alloy materials of nickel, cobalt, tungsten and molybdenum.

[0010] Furthermore, the protective cover is fixed by welding with anchor nails.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The utility model discloses a protective device for a gasifier cooling coil. The device has a reasonable structural design. A protective cover made of a high-temperature resistant alloy material is coated on the vulnerable surface of the cooling coil to prevent high-temperature substances from directly contacting the coil base material, thereby greatly extending the service life of the cooling coil and achieving good feedback from on-site use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of the structure of the slag outlet protection coil in the prior art.

[0014] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of a slag outlet protection coil in the prior art.

[0015] Figure 3 It is a structural schematic diagram of the lower slag mouth protection coil and its protection cover in Example 1 of the utility model.

[0016] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure of . DETAILED DESCRIPTION

[0017] The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings.

[0018] Example 1

[0019] Take the slag outlet cooling coil as an example. It is similar to the traditional cooling coil structure, and both use the spiral coil structure. The spiral coil is made of round steel pipe and is made through bending, grinding, butt welding, correction, assembly welding and other processes. The cooling coil is spirally wound to form a slag channel. When the slag material is going down, it is severely worn at the slag outlet of the slag outlet cooling coil due to the extremely high temperature, or the slag is accumulated at the slag outlet, which affects the use effect and cycle of the cooling coil.

[0020] In view of the above problems, a technical solution suitable for the slag outlet cooling coil is proposed.

[0021] like Figure 3 , 4 As shown, a protective device for a gasifier cooling coil comprises a channel formed by tightly winding the cooling coil, and a protective cover is arranged on the inner wall of the opening position of the last coil of the cooling coil, and the protective cover has the functions of high temperature resistance, wear resistance, corrosion resistance and erosion resistance. The cooling coil is spirally wound, and the protective cover is located between the last coil and the coil four or five upwards from the last coil.

[0022] Specifically, the protective cover is formed by splicing a plurality of sheet structures, and each sheet structure is attached to the wall of the cooling coil. The protective cover is welded by sheet metal materials, and further, the protective cover is made of two or more alloy materials of nickel, cobalt, tungsten, and molybdenum. The protective cover is molded by sheet metal according to the actual shape of the plurality of coils (or vulnerable parts) at the end of the cooling coil, and then welded and fixed to the corresponding position.

[0023] The middle section of the cooling coil is fixed by a flange, and the flange is fixed to the furnace body by bolts. The anchor nails are welded to the outer wall of the cooling coil and cast with high temperature resistant ceramics. When the vulnerable part at the end of the cooling coil is covered with a protective cover, the length of the anchor nails and the thickness of the casting material need to be adjusted according to the actual situation to ensure that the cross-sectional area of ​​the slag channel remains unchanged.

[0024] By improving the structure of the cooling coil at the slag outlet, the service life is increased from the original 180-200 days to at least 300 days, which greatly extends the service life.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A protective device for a gasifier cooling coil, characterized in that: It includes a channel formed by tightly winding the cooling coil, and a protective cover is arranged on the inner wall of the end coil opening position of the cooling coil, and the protective cover has the functions of heat insulation and anti-wear and erosion; the protective cover is located at the part of the cooling coil that is prone to ablation and wear; the protective cover made of high-temperature resistant alloy material is coated on the vulnerable surface of the cooling coil to avoid direct contact between high-temperature substances and the coil base material, thereby greatly extending the service life of the cooling coil.

2. The protective device for the gasifier cooling coil according to claim 1, characterized in that: The protective cover is formed by splicing a plurality of sheet structures, and each sheet structure is attached to the tube wall of the cooling coil.

3. A protective device for a gasifier cooling coil according to claim 1 or 2, characterized in that: The protective cover is formed by welding sheet metal according to the actual shape of the cooling coil.

4. The protective device for a gasifier cooling coil according to claim 1, characterized in that: The protective cover is fixed by welding with anchor nails.

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