A method for laying the heat insulation layer of a pyrolysis reactor

Abstract

This application relates to the field of furnace lining construction, and discloses a method for constructing a thermal insulation layer of a pyrolysis reactor, which includes the following steps: S1: Construct a base and place the pyrolysis reactor on the upper side of the base; S2: Lay a hot-melt support member and fix the hot-melt support member that is melted by high temperature on the pyrolysis reactor; S3: Construct a thermal insulation layer, and construct a high-temperature resistant thermal insulation layer on the hot-melt support member, and a heating cavity for heating the pyrolysis reactor is formed between the thermal insulation layer and the base; S4: Naturally air-dry to fix the thermal insulation layer and the base; S5: Heat the heating cavity to increase the temperature of the heating cavity and reach the ignition point of the hot-melt support member, so that the hot-melt support member detaches between the thermal insulation layer and the pyrolysis reactor. This application has the effects of ensuring the stability of the arch-shaped top thermal insulation layer stacking and improving the convenience of disassembling its support structure.

Description

Technical Field

[0001] This application relates to the field of furnace lining construction, and in particular to a method for constructing a thermal insulation layer of a pyrolysis reactor. Background Art

[0002] When the rotary kiln pyrolysis reactor is heated, external indirect heating is adopted, and heat transfer is used to make the materials inside the pyrolysis reactor fully absorb heat and pyrolyze at high temperature. During the reaction process, continuous heating is required to maintain the required temperature. Therefore, heat insulation treatment is required outside the pyrolysis reactor to prevent heat dissipation and play an energy-saving role.

[0003] In the related art, a furnace chamber of a pyrolysis reactor includes a base, and a heating device for heating the pyrolysis reactor is arranged inside the base. Since the top of the pyrolysis reactor is arched, an arched top insulation layer is arranged on the base. The top insulation layer is composed of refractory bricks stacked, and a heating chamber for heating the pyrolysis reactor is formed between the top insulation layer and the base. During operation, the heating device is used to heat the pyrolysis reactor in the heating chamber through a flame and maintain a certain temperature, so as to ensure that the temperature inside the pyrolysis reactor remains constant. When constructing the arched top insulation layer, an arched model is used to support the weight of the bricks to complete the masonry of the top arc area.

[0004] In view of the above related art, in the related art, after the refractory bricks are stacked on the arched model, when the refractory bricks are dried and fixed, the arched model needs to be disassembled. However, since the refractory bricks are directly placed on the arched model and the gap between the arched model and the refractory bricks is small, it is very difficult to smoothly disassemble the arched model, and urgent improvement is needed. Summary of the Invention

[0005] In order to ensure the stability of the arched top insulation layer stacking and improve the convenience of disassembling its support structure, this application provides a method for constructing a thermal insulation layer of a pyrolysis reactor.

[0006] A method for constructing a thermal insulation layer of a pyrolysis reactor provided by this application adopts the following technical solutions:

[0007] A method for constructing a thermal insulation layer of a pyrolysis reactor, S1: Construct the base and place the pyrolysis reactor on the upper side of the base;

[0008] S2: Lay a hot-melt support member and fix the hot-melt support member that will be melted by high temperature on the pyrolysis reactor;

[0009] S3: Construct the insulation layer, and construct a refractory insulation layer on the hot-melt support member. A heating chamber for heating the pyrolysis reactor is formed between the insulation layer and the base;

[0010] S4: Naturally air-dry to fix the insulation layer and the base;

[0011] S5: heating the heating chamber to increase the temperature of the heating chamber and reach the ignition point of the hot-melt support member, so that the hot-melt support member is separated from between the insulation layer and the pyrolysis reactor.

[0012] By adopting the above technical solution, the hot-melt support is fixed on the pyrolysis reactor, and then the insulation layer is built on the hot-melt support, which can ensure the stability of the insulation layer. Then, by increasing the temperature of the heating chamber, the hot-melt support is melted, so that the hot-melt support is separated from the insulation layer and the pyrolysis reactor, thereby forming a gap between the insulation layer and the pyrolysis reactor, which not only allows the entire outer wall of the pyrolysis reactor to be heated more fully, but also allows the smoke generated by the heating device in the base to be discharged smoothly; adopting such a design, not only the hot-melt support plays a supporting role in the insulation layer construction, which can make the insulation layer construction more stable, and the hot-melt support is eliminated by combining with high temperature, which can not only achieve the effect of further drying the insulation layer on the base and improving the firmness of the insulation layer and the base, but also further achieve the effect of eliminating the hot-melt support, reducing the complexity of disassembling the direct insulation layer structure and improving the convenience of insulation layer construction.

[0013] Preferably, step S5 comprises the following steps:

[0014] S5.1: Preliminarily increasing the temperature of the heating chamber to a temperature reaching the melting point of the hot-melt support member, thereby softening the hot-melt support member;

[0015] S5.2: Continue to increase the temperature of the heating chamber until the temperature reaches the ignition point of the hot-melt support, thereby causing the hot-melt support to burn;

[0016] S5.3: Maintain the temperature of the heating chamber for a certain period of time.

[0017] By adopting the above technical solution, the internal hot-melt support can be burned more fully, and the gradual heating method can reduce the deformation of the insulation layer and the base caused by thermal expansion and contraction, thereby improving the convenience of drying the insulation layer and the base.

[0018] Preferably, the insulation layer is built with high temperature resistant bricks.

[0019] By adopting the above technical solution, high-temperature resistant bricks with high strength and good rigidity are used, which improves the firmness of the overall structure, reduces the heat loss inside the heating chamber, and ensures the thermal insulation effect of the heating chamber.

[0020] Preferably, a high-temperature resistant casting layer is provided on the outside of the insulation layer, and the high-temperature resistant casting layer is laid on the outside of the insulation layer after the insulation layer is built.

[0021] By adopting the above technical solution, sealing is carried out again outside the heat preservation layer, so that the temperature in the heating cavity can be better thermally insulated, heat energy loss is reduced, and the constancy of the temperature inside the pyrolysis reactor is better ensured.

[0022] Preferably, after the hot-melt support member melts, a gap cavity is formed between the heat preservation layer and the pyrolysis reactor, and the width of the gap cavity is 10 cm - 15 cm.

[0023] By adopting the above technical solution, a distance of 10 cm - 15 cm can not only reduce the friction between the high-temperature expansion of the pyrolysis reactor and the heat preservation layer, but also enable the pyrolysis reactor to be heated more fully, and can reduce the heat loss in the heating cavity along with the flue gas during the heating process, ensuring the heat preservation effect of the heat preservation layer.

[0024] Preferably, the hot-melt support member is made of EPE.

[0025] By adopting the above technical solution, EPE has a non-crosslinked closed-cell structure, strong toughness and strong impact resistance. It can better support the heat preservation layer during use, and its melting point is relatively low, which can be better heated and melted to improve the convenience of removing the EPE.

[0026] Preferably, the base includes an inner layer and an outer layer, and a filling layer is filled between the inner layer and the outer layer. Both the inner layer and the outer layer are made of high-temperature resistant bricks.

[0027] By adopting the above technical solution, the support structure of the base is increased, and the filling layer can make the connection between the inner layer and the outer layer closer, ensuring the firmness of the overall structure. Both the inner layer and the outer layer are made of high-temperature resistant bricks, so that the surface structure of the inner and outer layers is not easily damaged. The inner layer of the base can better place the heating device, and can improve the cleanliness and beauty of the outer layer of the base.

[0028] Preferably, a transition connection inclined block is arranged at the connection between the base and the heat preservation layer.

[0029] By adopting the above technical solution, since the masonry methods of the heat preservation layer and the base are different from those of the rear hopper, there will be a certain difference in the deformation amount between the upper heat preservation layer and the lower base during heating. The transition connection inclined block can strengthen the connection between the heat preservation layer and the base, thereby reducing the possibility of gaps appearing at the connection, reducing the heat loss in the heating cavity, and ensuring the heating and heat preservation effect of the pyrolysis reactor; and because the widths of the base and the heat preservation layer are different, the transition connection inclined block can play a guiding role, so that the heat and flue gas generated by the heating device can flow better along the outer wall of the pyrolysis reactor, ensuring the heating effect of the pyrolysis reactor.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The support function of the hot-melt support member for the masonry of the thermal insulation layer can make the masonry of the thermal insulation layer more stable, and cooperate with high temperature to eliminate the hot-melt support member. This can not only further dry the thermal insulation layer on the base to improve the firmness between the thermal insulation layer and the base, but also further achieve the effect of eliminating the hot-melt support member, reducing the complexity of directly disassembling the thermal insulation layer structure, and improving the convenience of masonry of the thermal insulation layer;

[0032] 2. By burning the hot-melt support member in a gradually heating manner, the hot-melt support member inside can be burned more fully, and the heating method of gradually heating can reduce the deformation of the thermal insulation layer and the base caused by thermal expansion and contraction, improving the convenience of drying the thermal insulation layer and the base;

[0033] 3. Sealing again on the outside of the thermal insulation layer can better keep the temperature in the heating cavity, reduce heat energy loss, and better ensure the constancy of the temperature inside the pyrolysis reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a method for masonry of a thermal insulation layer of an embodiment of the present application.

[0035] Reference numerals: 1, high-temperature casting layer; 2, thermal insulation layer; 3, pyrolysis reactor; 4, transition connection inclined block; 5, inner layer; 6, injection layer; 7, outer layer; 8, hot-melt support member; 9, heating cavity; 10, base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will further describe the present application in detail Figure 1 with reference to the accompanying drawings.

[0037] The embodiment of the present application discloses a method for masonry of a thermal insulation layer of a pyrolysis reactor.

[0038] Referring to Figure 1 , a method for masonry of a thermal insulation layer of a pyrolysis reactor includes the following steps:

[0039] S1: Construct the base 10. The base 10 is of a U-shaped structure. The base 10 includes an inner layer 5 and an outer layer 7. The inner layer 5 and the outer layer 7 are constructed with high-temperature resistant bricks. A filling layer 6 is filled between the inner layer 5 and the outer layer 7. The filling layer 6 is composed of aggregate, powder mineral additive. During production, first, use high-temperature resistant bricks to construct the outer layer 7, then lay the filling layer 6, and finally lay the high-temperature resistant bricks of the inner layer 5, thus completing the construction of the base 10. Through the design of the three-layer structure, the base 10 can be made more firm and reduce the heat loss inside the cavity. After completing the construction of the base 10, both ends of the base 10 are constructed with high-temperature resistant bricks, and the pyrolysis reactor 3 is installed on the upper side of the base 10 and fixed by the high-temperature resistant bricks at both ends, so that there is a circulating space between the side wall of the pyrolysis reactor 3 and the top of the U-shaped base 10.

[0040] S2: Lay the hot melt support 8. The hot melt support 8 is made of EPE. The thickness of the EPE is 10 cm - 15 cm. The EPE is polyethylene foam and is a non-crosslinked closed-cell structure, and is composed of countless independent bubbles generated by physical foaming of low-density polyethylene resin. It has strong toughness and strong impact resistance. Lay high-temperature resistant bricks on the EPE. The EPE is evenly stressed, and there are enough stress points to support during bricklaying, greatly reducing the construction difficulty. The bricklaying is relatively easy and the arched structure can be quickly completed. There is a tape pasted on the hot melt support 8. The staff fixes the hot melt support 8 to the pyrolysis reactor 3 through the tape, thereby reducing the movement of the hot melt support 8 and improving the fixing stability of the hot melt support 8.

[0041] S3: Construct the insulation layer 2. The insulation layer 2 is constructed with high-temperature resistant bricks. The high-temperature resistant bricks have high strength and good rigidity, which can greatly improve the firmness of the overall structure and reduce the heat dissipation inside the heating cavity 9, ensuring the insulation effect of the heating cavity 9. Lay high-temperature resistant bricks on the hot melt support 8. An heating cavity 9 for heating the pyrolysis reactor 3 is formed between the insulation layer 2 and the base 10. The heating device can better heat the pyrolysis reactor 3 in the heating cavity 9. When constructing the insulation layer 2, a transition connection inclined block 4 is fixed at the connection between the base 10 and the insulation layer 2. The transition connection inclined block 4 is composed of aggregate, powder mineral additive, so that it can be more firmly connected to the filling layer 6 of the base 10 and increase the contact surface with the insulation layer 2, ensuring the firmness of the connection between the insulation layer 2 and the base 10.

[0042] After the insulation layer 2 is laid, a high-temperature resistant casting layer 1 is laid on the outside of the insulation layer 2. The high-temperature resistant casting layer 1 is composed of aggregate, powder mineral additive. On the one hand, through the high-temperature resistant casting layer 1, it can cooperate with the insulation layer 2 to better reduce the heat loss in the heating cavity 9, ensure the insulation effect of the whole structure, and improve the energy-saving effect of the structure. On the other hand, it can make the outside of the insulation layer 2 relatively smooth and improve the aesthetic degree of the overall structure.

[0043] S4: Natural air drying. After the construction is completed, let the entire structure air dry naturally for 7 days to evaporate most of the moisture, so that the base 10, the thermal insulation layer 2 and the high-temperature casting layer 1 can be fixed more firmly, ensuring the firmness of the overall structure.

[0044] S5: Heat the heating chamber 9. Heat the heating chamber 9 through the heating device to reach the melting point of the support member, so that the hot-melt support member 8 detaches between the thermal insulation layer 2 and the pyrolysis reactor 3;

[0045] S5.1: Initially increase the temperature of the heating chamber 9, and use the flame generated by the heating device to heat the heating chamber 9. The temperature in the heating chamber 9 is maintained at 50 degrees Celsius and kept for 30 minutes to make the EPE reach the melting point and become soft;

[0046] S5.2: Continue to increase the temperature of the heating chamber 9 to make the temperature of the heating chamber 9 reach 100 degrees Celsius, so that the EPE reaches the ignition point and the EPE burns;

[0047] S5.3: Keep the temperature in the heating chamber 9, control the temperature of the heating chamber 9 between 100 degrees Celsius and 150 degrees Celsius, and continue for 60 minutes to fully burn the EPE in the heating chamber 9 and dry the base 10, the thermal insulation layer 2 and the high-temperature casting layer 1, ensuring the firmness of the overall structure.

[0048] After the hot-melt support member 8 burns out completely, the hot-melt support member 8 melts away, and a gap chamber is formed between the thermal insulation layer 2 and the pyrolysis reactor 3. The width of the gap chamber is 10 cm - 15 cm. After the gap chamber is formed, the high-temperature expansion of the pyrolysis reactor 3 and the thermal insulation layer 2 can be reduced from generating friction, thus ensuring the stability of the entire structure. Moreover, the width of the gap chamber is appropriate, which can reduce the heat of the heating chamber 9 from dissipating along with the flue gas, ensuring the heat insulation effect of the entire structure.

[0049] The above are all the preferred embodiments of this application. The protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A method for laying the thermal insulation layer of a pyrolysis reactor, characterized in that: It includes the following steps: S1: Build the base (10) and place the pyrolysis reactor (3) on the upper side of the base (10); S2: Lay the hot-melt support member (8), fix the hot-melt support member (8) that melts under high temperature on the pyrolysis reactor (3), and the hot-melt support member (8) is made of EPE; S3: Build the heat-insulating layer (2), build the high-temperature resistant heat-insulating layer (2) on the hot-melt support member (8), and a heating cavity (9) for heating the pyrolysis reactor (3) is formed between the heat-insulating layer (2) and the base (10); S4: Air dry naturally to fix the heat-insulating layer (2) and the base (10); S5: Heat the heating cavity (9), increase the temperature of the heating cavity (9), and reach the ignition point of the hot-melt support member (8) to make the hot-melt support member (8) detach between the heat-insulating layer (2) and the pyrolysis reactor (3); Step S5 includes the following steps: S5.1: Initially increase the temperature of the heating cavity (9): Make the temperature reach the melting point of the hot-melt support member (8) so that the hot-melt support member (8) becomes soft; S5.2: Continue to increase the temperature of the heating cavity (9) to make the temperature reach the ignition point of the hot-melt support member (8) so that the hot-melt support member (8) burns; S5.3: Keep the temperature of the heating cavity (9) for a certain period of time.

2. A method for laying the thermal insulation layer of a pyrolysis reactor according to claim 1, characterized in that: The heat-insulating layer (2) is built with high-temperature resistant bricks.

3. A method for laying the thermal insulation layer of a pyrolysis reactor according to claim 2, characterized in that: A high-temperature resistant casting layer (1) is arranged outside the heat-insulating layer (2), and the high-temperature resistant casting layer (1) is laid outside the heat-insulating layer (2) after the construction of the heat-insulating layer (2) is completed.

4. A method for laying the thermal insulation layer of a pyrolysis reactor according to claim 1, characterized in that: After the hot-melt support member (8) melts, a gap cavity is formed between the heat-insulating layer (2) and the pyrolysis reactor (3), and the width of the gap cavity is 10 cm - 15 cm.

5. A method for laying the thermal insulation layer of a pyrolysis reactor according to claim 1, characterized in that: The base (10) includes an inner layer (5) and an outer layer (7), a filling layer (6) is filled between the inner layer (5) and the outer layer (7), and both the inner layer (5) and the outer layer (7) are built with high-temperature resistant bricks.

6. A method for laying the thermal insulation layer of a pyrolysis reactor according to claim 5, characterized in that: A transition connection inclined block (4) is arranged at the connection between the base (10) and the heat-insulating layer (2).

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