Quenching platform and gasification furnace

Abstract

The utility model discloses a chilling platform and gasifier relates to chemical engineering device field, including heat exchange area and isolation area, heat exchange area includes heat exchange tube, heat exchange tube from inside to outside in proper order, in the vertical direction in the heat exchange area inner circle is higher than outer circle, isolation area includes isolation heat pipe, isolation heat pipe is provided outside heat exchange area outer circle, and the isolation heat pipe is equipped with the heat exchange area outer circle. The surfacing layer covers the upper surface of the heat exchange area, the thermal expansion coefficient of the heat exchange tube material is the same as that of the surfacing layer material, and the refractory material layer covers the upper surface of the surfacing layer. The heat exchange tube and the surfacing layer are made of materials with the same thermal expansion coefficient, the expansion degrees of the heat exchange tube and the surfacing layer are consistent when the heat exchange tube and the surfacing layer are heated, further development of cracks and intergranular cracks can be avoided, and the heat exchange tube cannot be damaged. The refractory material layer serves as a heat transfer layer between the synthesis gas and the surfacing layer, direct contact between the synthesis gas and the surfacing layer is avoided, the temperature of the side, making contact with the surfacing layer, of the refractory material layer is low, the surfacing layer is separated from the sensitization temperature zone environment, and cracks are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of chemical industry device especially, it is a kind of quenching platform and gasification furnace. BACKGROUND

[0002] Gasification furnace is one of the key equipment in coal gasification device, coal powder, oxygen and steam are converted by combustion in gasification furnace to prepare raw material gas required for producing synthetic ammonia. High-temperature synthesis gas of 1600 degrees Celsius flows out from the top of gas conveying section, and high-temperature synthesis gas is quenched with 200 degrees Celsius synthesis gas at quenching port position, so that the temperature is reduced to about 900 degrees Celsius. Quenching platform is a contact heat exchange device arranged between quenching port and combustion chamber, which functions to cool high-temperature synthesis gas, and refrigerate low-temperature synthesis gas, so that high-temperature synthesis gas reaches the required temperature more quickly. The inventor knows that the inside of a quenching platform structure is composed of multiple rings of heat exchange tubes, which are fixed by using hard surfacing process on the side of heat exchange with high-temperature synthesis gas. The heat exchange tubes and the hard surfacing layer together constitute the main body of the quenching platform. On the one hand, cracks and intergranular cracks may exist in the hard surfacing layer after cooling and forming, and the hard surfacing layer and the heat exchange tubes may expand at different degrees due to the difference in material between the hard surfacing layer and the heat exchange tubes, which may cause the hard surfacing layer and the heat exchange tubes to be squeezed and pulled against each other, further expand the original cracks and intergranular cracks, and cause the heat exchange tubes to be damaged. Finally, the heat exchange medium in the heat exchange tubes may be sprayed out of the damaged part and leak out of the quenching platform along the cracks in the hard surfacing layer. On the other hand, the hard surfacing layer of the quenching platform may be sensitized to crack due to the high-temperature environment of not less than 900 degrees Celsius for a long time, which may accelerate the damage of the hard surfacing layer. SUMMARY

[0003] The purpose of the utility model is to provide a quenching platform to solve the problems existing in the prior art. In the utility model, the heat exchange tubes and the hard surfacing layer of the quenching platform are made of materials with the same thermal expansion coefficient, so that the expansion degrees of the heat exchange tubes and the hard surfacing layer are consistent when heated, which maximally eliminates the squeezing and pulling effect of the hard surfacing layer and the heat exchange tubes against each other, avoids the further development of the original cracks and intergranular cracks, and does not cause the heat exchange tubes to be damaged. The refractory material layer provided on the surface of the hard surfacing layer serves as a heat transfer layer between the synthesis gas and the hard surfacing layer, which avoids the direct contact of the synthesis gas with the hard surfacing layer. The temperature on the side of the refractory material layer in contact with the hard surfacing layer is relatively low, which causes the hard surfacing layer to be away from the sensitization temperature environment and avoids the generation of cracks.

[0004] The utility model also provides a gasification furnace comprising the above-mentioned quenching platform, and the technical effects thereof will not be described again.

[0005] To achieve the above-mentioned purpose, the utility model provides the following solutions:

[0006] The utility model provides a quenching platform, including heat exchange area and isolation area, the heat exchange area includes at least two annular heat exchange pipe, the heat exchange pipe is sequentially arranged from inside to outside, the inner ring of heat exchange area is higher than the outer ring in vertical direction, the isolation area includes at least one isolated heat pipe, the isolated heat pipe is matched with the outer ring of heat exchange area, the isolated heat pipe is arranged in the outside of the outer ring of heat exchange area, the surfacing layer covers the upper surface of heat exchange area, the thermal expansion coefficient of the material of heat exchange pipe is same with the thermal expansion coefficient of the material of surfacing layer, and the refractory layer covers the upper surface of surfacing layer.

[0007] Preferably, the material of the heat exchange pipe and the surfacing layer is full austenitic nickel iron chromium alloy.

[0008] Preferably, the outer walls of adjacent heat exchange pipes are in contact, and a reinforcing ring for filling space is arranged at a position where the adjacent heat exchange pipes are not in contact, and the thermal expansion coefficient of the material of the reinforcing ring is consistent with the thermal expansion coefficient of the material of the heat exchange pipe.

[0009] Preferably, the connecting line of the center points of the pipe body cross sections of the heat exchange pipes is a straight line.

[0010] Preferably, the angle between the connecting line of the center points of the pipe body cross sections of the heat exchange pipes and the horizontal direction is 10-20 degrees.

[0011] Preferably, the angle between the connecting line of the center points of the radial cross sections of the pipe bodies of the heat exchange pipes and the horizontal direction is 15 degrees.

[0012] Preferably, the number of the heat exchange pipes is six, and the number of the isolated heat pipes is one.

[0013] Preferably, the material of the refractory layer is chrome corundum ramming material.

[0014] The utility model also provides a gasification furnace, including synthetic gas generating device, low temperature synthetic gas supply device and above-mentioned quenching platform, the isolation area is arranged in the top of synthetic gas generating device, and the intermediate backing plate is arranged between the isolation area and synthetic gas generating device, the air pipe is arranged in the inside of heat exchange area, the gas production area of synthetic gas generating device is connected with the air inlet end of air pipe, and the air outlet end of air pipe is connected with synthetic gas cooling area, the low temperature synthetic gas supply device is arranged above heat exchange area, and the air outlet end of low temperature synthetic gas supply device is connected with synthetic gas cooling area.

[0015] Preferably, the thickness of the intermediate backing plate is at least millimeter.

[0016] Compared with the prior art, the utility model has the following technical effects:

[0017] The utility model provides a kind of quenching platform, the heat exchange tube and surfacing layer of quenching platform adopt the material of same thermal expansion coefficient, the expansion degree of heat exchange tube and surfacing layer is consistent when being heated, maximum limit eliminates the effect of surfacing layer and heat pipe mutual extrusion, pulling, both can avoid the further development of original crack and intercrystalline cracking, also can not cause heat exchange tube damage.Surfacing layer surface set up refractory layer as the heat transfer layer between synthesis gas and surfacing layer, avoid synthesis gas and surfacing layer direct contact, the temperature of the side of refractory layer and surfacing layer contact is lower, let surfacing layer separate sensitization temperature zone environment, avoid generating crack.

[0018] The utility model also provides a kind of gasification furnace, including above-mentioned quenching platform, its technical effect is not repeated. ACCURACY

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed in the embodiments will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0020] Figure 1 It is the sectional view structural schematic drawing of a kind of quenching platform in the utility model embodiment;

[0021] Figure 2 It is the overhead view structural schematic drawing of a kind of heat exchange zone in the utility model embodiment;

[0022] Figure 3 It is the sectional view structural schematic drawing of a kind of gasification furnace in the utility model embodiment;

[0023] Figure 4 It is the structural schematic drawing of A in the utility model embodiment.

[0024] Wherein, 1, heat exchange zone;2, isolation zone;3, surfacing layer;4, refractory layer;5, synthesis gas generating device;6, low-temperature synthesis gas supply device;7, intermediate backing plate;8, air pipe;9, gas production zone;10, synthesis gas cooling zone. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be clearly and completely described in the drawings of the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the utility model.

[0026] The utility model discloses a quenching platform to solve the problems of prior art, the heat exchange pipe and the surfacing layer of the quenching platform in the utility model adopt the material of same thermal expansion coefficient, and the expansion degree of the heat exchange pipe and the surfacing layer is consistent when heated, which maximally eliminates the mutual extrusion and pulling effect of the surfacing layer and the heat pipe, avoids further development of the original crack and intergranular cracking, and does not cause damage of the heat exchange pipe. The refractory material layer arranged on the surface of the surfacing layer serves as a heat transfer layer between the synthetic gas and the surfacing layer, avoids direct contact of the synthetic gas and the surfacing layer, the temperature of the side of the refractory material layer in contact with the surfacing layer is low, the surfacing layer is separated from the sensitization temperature environment, and crack generation is avoided.

[0027] The utility model further provides a gasification furnace, including above-mentioned quenching platform, and its technical effect does not repeat here.

[0028] In order to make above-mentioned purpose, feature and advantage of the utility model more obvious and easy to understand, below, combining with the specific embodiment and the drawing, the utility model is further explained in detail.

[0029] As shown in Figure 1 And Figure 2 The utility model provides a quenching platform, including heat exchange area 1 and isolation area 2, heat exchange area 1 includes at least two annular heat exchange pipes, and the heat exchange pipe is sequentially arranged from inside to outside, and the inner ring of heat exchange area 1 is higher than the outer ring in vertical direction, and isolation area 2 includes at least one isolation heat pipe, and the isolation heat pipe is matched with the outer ring of heat exchange area 1, and the isolation heat pipe is arranged on the outside of the outer ring of heat exchange area 1, and the surfacing layer 3 covers the upper surface of heat exchange area 1, and the thermal expansion coefficient of the material of heat exchange pipe is same with the thermal expansion coefficient of the material of surfacing layer 3, and the refractory material layer 4 covers the upper surface of surfacing layer 3. In the utility model, the upper surface of quenching platform is heat exchange surface, therefore, surfacing layer 3 and refractory material layer 4 are located above heat exchange area 1. The flowing heat exchange medium is led into heat exchange pipe, and the heat exchange medium continuously absorbs the heat transferred from refractory material layer 4 to heat exchange pipe in the flowing process. The quenching platform of the utility model needs to be arranged on the synthetic gas generating device 5 of higher temperature, and isolation area 2 is used to isolate quenching platform and synthetic gas generating device 5, avoids the temperature of synthetic gas generating device 5 to produce influence on heat exchange area 1, and the heat exchange medium led into isolation heat pipe is same with the heat exchange medium led into heat exchange pipe. The area covered by surfacing layer 3 includes the gap between heat exchange pipes and above heat exchange pipe, and the thickness of surfacing layer 3 above heat exchange pipe is no less than 4mm.

[0030] In a preferred embodiment, the material of heat exchange pipe and surfacing layer 3 is full austenitic nickel iron chromium alloy, and in the utility model, heat exchange pipe and surfacing layer 3 can also be other same materials.

[0031] As shown in Figure 1As shown, the outer walls of adjacent heat exchange pipes are in contact, a reinforcing ring for filling the space is arranged at a position where the adjacent heat exchange pipes are not in contact, and the thermal expansion coefficient of the material of the reinforcing ring is consistent with the thermal expansion coefficient of the material of the heat exchange pipe.

[0032] As shown in the figure, Figure 1 characterized in that: the connecting line of the center points of the pipe body cross section of the heat exchange pipe is a straight line, so that the surface of the heat exchange area 1 is a flat inclined plane, and the angle between the connecting line of the center points of the radial cross section of the pipe body of the heat exchange pipe and the horizontal direction is 10-20 degrees, and in a preferred embodiment, the angle between the connecting line of the center points of the radial cross section of the pipe body of the heat exchange pipe and the horizontal direction is 15 degrees.

[0033] As shown in the figure, Figure 1 In a preferred embodiment, the number of heat exchange pipes is six, and the number of isolation heat pipes is one.

[0034] In a preferred embodiment, the material of the refractory layer 4 is chrome corundum ramming material.

[0035] As shown in the figure, Figure 3 and Figure 4 The utility model also provides a gasification furnace, including synthetic gas generating device 5, low temperature synthetic gas supply device 6 and above-mentioned quenching platform, isolation area 2 with setting at the top of synthetic gas generating device 5, and the intermediate backing plate 7 is arranged between isolation area 2 and synthetic gas generating device 5, and the air pipe 8 is arranged in the inside of heat exchange area 1, the air inlet end of air pipe 8 is communicated with the gas production area 9 of synthetic gas generating device 5, the air outlet end of air pipe 8 is communicated with synthetic gas cooling area 10, and low temperature synthetic gas supply device 6 is arranged above heat exchange area 1, and the air outlet end of low temperature synthetic gas supply device 6 is communicated with synthetic gas cooling area 10. The outer wall of synthetic gas generating device 5 is provided with cooling pipe, the gas production area 9 is the internal area of synthetic gas generating device 5, high temperature synthetic gas is discharged from synthetic gas generating device 5 to synthetic gas cooling area 10 through air pipe 8, low temperature synthetic gas supply device 6 sprays low temperature synthetic gas to the discharged high temperature synthetic gas to mix and cool down, in this process, the mixed gas group will diffuse and contact with quenching platform, and contact heat exchange is realized. In a preferred embodiment, the thickness of the intermediate backing plate 7 is at least 6mm, and the distance between the top end of the quenching platform and the low temperature synthetic gas supply device 6 is at least 38mm.

[0036] The utility model provides a kind of assembly method of quenching platform, specific steps are:

[0037] 1) the heat exchange pipe and isolation heat pipe of quenching platform select the straight pipe of size φ38×8mm, material is N08825, the straight pipe selected corresponds to standard: GB / T30059-2013 (ASTM B705), and the material selected for sealing welding filling flake is N08825.

[0038] 2) The heat exchange tubes and insulation heat pipes shall be manufactured by cold bending or hydraulic bending process. There shall be no splicing in the whole circle of heat exchange tubes and insulation heat pipes. After processing, the minimum wall thickness shall not be less than 90% of the nominal wall thickness. After processing, the surface of heat exchange tubes and insulation heat pipes shall be 100% PT tested and qualified as Grade I.

[0039] 3) The quenching platform is fabricated as a whole according to the drawings. It is pre-assembled on site to ensure the flatness of the platform and record it. After the assembly is qualified, the quenching platform is divided into two parts at 0° and 180°. The platform is placed in the position that can reach the A3 manhole annulus of the gasifier. The cut annulus pipe is marked and the bevel is ground. The bevel is wrapped with tape to prevent contamination and debris from entering the pipe. In order to ensure the assembly and welding requirements in the furnace, the welds of the split annulus pipe at the 180° position should be staggered.

[0040] 4) Installation: such as Figure 2 As shown, a) Place the 1st, 2nd, 3rd, and 4th ring pipes in the correct positions (note the orientation of the inlet and outlet pipes), assemble them into a ring according to the drawing, spot weld them firmly, and then move them apart to facilitate welding (welding is not allowed with open windows; when assembling, spot weld the prepared arc plate tooling at the tangent positions of adjacent inner and outer rings 3 to 7 to ensure that the center line distance of the ring pipes is 40mm). After welding, remeasure and verify.

[0041] b. Assemble and weld the 5-7 coils of pipe according to the assembly method of 2, 3, 4 coils. No open welding is allowed for the 5-7 coils. Note that during the entire assembly and welding process, check that the top of the 3-7 coils of pipe are in a straight line.

[0042] c. The center lines of the 3rd to 7th rings of pipe form a 15° angle with the horizontal direction from the outside to the inside. The horizontal difference between the center lines of the 2nd ring and the 3rd to 7th rings is 14mm, and the center distance is 37.5mm. The angle of the 2nd ring is different from that of the 3rd to 7th rings. When installing the 2nd to 7th rings, the gap between the top of the outer circle of the 2nd ring pipe and the 15° angle special tool should be adjusted to about 4mm as shown in the figure below. The upper part of the outer circle of the 2nd to 7th rings of pipe should be measured with the special tool to ensure that the center lines of the 2nd to 7th rings of pipe are in a straight line and form a 15° angle with the horizontal direction.

[0043] d. The thickness of the weld overlay on the second ring of the heated surface is 4mm. The space between the 2nd to 7th rings of pipe is filled with φ10 round steel of the same material as the ring pipe and then welded to be flush with the top of the outer circle of the pipe. After the weld is completed, it forms a 15° conical surface, and the height difference is required to be less than 1mm.

[0044] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A chill plate, characterized by: The heat exchange zone (1) comprises at least two annular heat exchange pipes, which are arranged from inside to outside, and the inner circle of the heat exchange zone (1) is higher than the outer circle in the vertical direction, and the isolation zone (2) comprises at least one isolation heat pipe which matches the outer circle of the heat exchange zone (1) and is arranged outside the outer circle of the heat exchange zone (1). The surfacing layer (3) covers the upper surface of the heat exchange zone (1), the thermal expansion coefficient of the material of the heat exchange pipe is the same as that of the material of the surfacing layer (3), and the refractory material layer (4) covers the upper surface of the surfacing layer (3).

2. The chill plate of claim 1, wherein: The material of the heat exchange pipe and the surfacing layer (3) is full austenitic nickel-iron-chromium alloy.

3. The chill plate of claim 1, wherein: The outer walls of adjacent heat exchange pipes are in contact, and a reinforcing ring for filling space is arranged at the position where the adjacent heat exchange pipes are not in contact, and the thermal expansion coefficient of the material of the reinforcing ring is consistent with that of the material of the heat exchange pipe.

4. The chill plate of claim 1, wherein: The center point connection line of the pipe body section of the heat exchange pipe is a straight line.

5. The chill plate of claim 4, wherein: The angle between the center point connection line of the pipe body section of the heat exchange pipe and the horizontal direction is 10-20 degrees.

6. The chill plate of claim 5, wherein: The angle between the center point connection line of the radial section of the pipe body of the heat exchange pipe and the horizontal direction is 15 degrees.

7. The chill plate of claim 1, wherein: The number of heat exchange pipes is six, and the number of isolation heat pipes is one.

8. The chill plate of claim 1, wherein: The material of the refractory material layer (4) is chrome corundum ramming material.

9. A gasifier characterized by: The synthesis gas generation device (5), the low-temperature synthesis gas supply device (6), and the quenching platform of any one of claims 1-8 are provided, the isolation zone (2) is arranged at the top of the synthesis gas generation device (5), and an intermediate backing plate (7) is arranged between the isolation zone (2) and the synthesis gas generation device (5). An air pipe (8) is arranged inside the heat exchange zone (1), the air inlet end of the air pipe (8) is communicated with the gas production zone (9) of the synthesis gas generation device (5), and the air outlet end of the air pipe (8) is communicated with the synthesis gas cooling zone (10). The low-temperature synthesis gas supply device (6) is arranged above the heat exchange zone (1), and the air outlet end of the low-temperature synthesis gas supply device (6) is communicated with the synthesis gas cooling zone (10).

10. The gasifier of claim 9, wherein: The thickness of the intermediate backing plate (7) is at least 6 mm.

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