Energy-saving device for heating modified pitch by tubular furnace
By setting up an insulation jacket on the outer shell of the reactor and using the high-temperature flue gas discharged from the tube furnace for insulation, the problem of large heat dissipation of the reactor is solved, and the heat load of the tube furnace is reduced and the energy-saving effect is improved.
Patent Information
- Application Number
- CN202421767722.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the existing tube furnace heating method modified asphalt production process, the heat dissipation of the reactor is huge, resulting in two-thirds of the heat supply of the tube furnace being used to supplement the heat dissipation, which is inefficient and difficult to achieve the energy-saving goal.
An energy-saving device is designed to provide insulation jackets on the outer shell of the reactor and pass high-temperature flue gas discharged from the tube furnace into the insulation jacket, isolate the influence of external ambient temperature on the heat dissipation of the reactor, reduce the heat dissipation of the reactor, thereby reducing the heat load of the tube furnace.
It effectively reduces the heat dissipation of the reactor, reduces the heat load of the tube furnace, achieves the energy saving goal, and improves the thermal efficiency of the tube furnace.
Smart Images
Figure CN222842082U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of metallurgical coking, and in particular relates to an energy-saving device for heating and modifying asphalt in a tubular furnace. Background Art
[0002] In the process of coal tar processing, about 50% to 60% of asphalt is generally produced, which is a major product of tar processing. The larger the processing scale, the more asphalt is produced. Modified asphalt is currently the main downstream product of asphalt, mainly used in the production of pre-baked anodes in the electrolytic aluminum industry, and the preparation of battery rods or electrode binders.
[0003] At present, the domestic production process of modified asphalt mostly adopts the thermal polycondensation method. The thermal polycondensation method can be divided into kettle heating method and tubular furnace heating method according to the heating method. Only the tubular furnace heating method is discussed below.
[0004] The modified asphalt production process of the tubular furnace heating method achieves the purpose of asphalt modification based on the residence time of the reactants of the medium-temperature asphalt in the modified asphalt reactor and the reaction temperature. The residence time is provided by controlling the volume of the reactor, and the reaction temperature is guaranteed by the tubular heating furnace. There are two types of process: double furnace double kettle process and single furnace single kettle process. Double furnace double kettle process uses medium temperature asphalt as raw material, and the reaction is carried out in two steps. The medium temperature asphalt sent from the tar distillation unit has a temperature of about 370℃ and is sent to the No. 1 reactor for primary modification. The temperature in the reactor is controlled at about 380℃ by the No. 1 tubular furnace for heating. The asphalt mainly undergoes β-modification reaction. The flash oil and gas produced by flash evaporation and cracking are discharged from the top of the reactor to the condenser cooler at the back. The asphalt after the primary modification is sent to the No. 2 reactor for secondary modification. The secondary modification reaction process of asphalt is basically the same as the primary modification reaction process. The temperature in the reactor is controlled at about 400℃ by the No. 2 tubular furnace for heating. The α- and β-modification reactions are carried out simultaneously. The flash oil and gas produced by flash evaporation and cracking are discharged from the top of the reactor to the condenser cooler at the back. The asphalt after the secondary modification is the finished modified asphalt. The single-furnace single-kettle process also uses medium-temperature asphalt as raw material. The asphalt is heated in a tubular heating furnace and then reacted in a reactor to complete the reaction in one step. However, the product quality control is not as flexible as the double-furnace double-kettle process.
[0005] The modified asphalt production process of the tubular furnace heating method uses the tubular furnace as the heat source. The heating of the tubular furnace includes two parts: the heat to heat the raw materials to the reaction temperature and the heat to maintain the reaction temperature. Taking a modification reaction as an example, the medium-temperature asphalt raw material is about 370℃ and sent to the No. 1 reactor. Through the No. 1 tubular furnace, the medium-temperature asphalt raw material is heated from 370℃ to 380℃ for a modification, and the reaction temperature of the No. 1 reactor is maintained at 380℃. Maintaining the No. 1 reactor at 380℃ is to make up for the heat dissipation of the No. 1 reactor. Since the modification reaction requires a residence time of 8 to 10 hours, the volume of the reactor is huge. Although there is external insulation, the heat dissipation of the reactor is still huge. After production practice, only one-third of the heat supply of the tubular furnace is used for the modification reaction, and the other two-thirds of the heat supply is used to supplement the heat dissipation of the reactor. Therefore, reducing the heat dissipation of the reactor is the main direction of energy saving. Utility Model Content
[0006] The purpose of the utility model is to provide an energy-saving device for heating modified asphalt in a tubular furnace, which overcomes the shortcomings of the prior art, and provides a thermal insulation jacket on the outer shell of the reactor, and passes the high-temperature flue gas discharged by the tubular furnace into the thermal insulation jacket of the reactor, thereby isolating the influence of the ambient temperature on the heat dissipation of the reactor, reducing the heat dissipation of the reactor, thereby reducing the heat load of the tubular furnace and achieving the goal of energy saving.
[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions:
[0008] An energy-saving device for heating modified asphalt in a tubular furnace comprises a reactor, a modified asphalt circulation pump and a tubular furnace, characterized in that an insulation jacket is provided on the side wall and the outer side of the bottom of the reactor, the insulation jacket is in multiple sections and is connected in series through pipelines, an expansion joint is provided between upper and lower adjacent insulation jackets, the expansion joint is filled with elastic insulation material, a gap is provided between the inner side of the insulation jacket and the outer side of the side wall of the reactor, and the upper and lower ends of the gap are sealed by insulation material to form a closed cavity; the bottom smoke inlet of the lowermost insulation jacket is connected to the smoke outlet of the tubular furnace, the smoke outlet of the uppermost insulation jacket is connected to the heat exchange medium inlet of an air preheater, the heat exchange medium outlet of the air preheater is connected to the subsequent desulfurization and denitrification section, the air inlet of the air preheater is connected to the air fan, and the air outlet of the air preheater is connected to the air inlet of the tubular furnace.
[0009] A temperature recording and controlling instrument is arranged on the pipeline of the smoke outlet of the uppermost insulation jacket, the smoke outlet of the uppermost insulation jacket and the bottom smoke inlet of the lowermost insulation jacket are connected through a bypass smoke pipe, a pressure differential regulating valve is arranged on the bypass smoke pipe, and the pressure differential regulating valve is interlocked with the temperature recording and controlling instrument for control.
[0010] The width of the expansion joint is 50-100 mm.
[0011] The width of the gap is 30-80 mm.
[0012] The reactor is arranged as a single reactor or a double reactor.
[0013] An independent heat-insulating structure is arranged on the top of the reactor.
[0014] The heat-insulating jacket is provided with 3-10 sections, and the height of each section is 800-2500 mm.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] 1) By covering the reactor shell with an insulation jacket and using the high-temperature flue gas discharged from the tubular furnace as the insulation medium to isolate the influence of the ambient temperature on the heat dissipation of the reactor, the waste heat of the flue gas discharged from the tubular furnace is effectively utilized, which can effectively reduce the heat dissipation of the reactor, reduce the heat load of the tubular furnace by nearly one-third, and reduce the consumption of electricity or steam, thereby achieving the goal of energy saving;
[0017] 2) At the same time, it also improves the thermal efficiency of the tube furnace and has a positive impact on energy saving in the production process. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the process flow of an embodiment of the utility model.
[0019] In the figure: 1-reaction kettle, 2-modified asphalt circulation pump, 3-tubular furnace, 4-insulation jacket, 5-air fan, 6-air preheater, 7-pressure difference regulating valve, 8-expansion joint, 9-gap, 10-bypass flue gas pipe, TRC-temperature recording control instrument, PDRC-pressure difference recording control instrument. DETAILED DESCRIPTION
[0020] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.
[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.
[0022] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.
[0023] See Figure 1 , is a schematic diagram of a process flow of an energy-saving device for heating modified asphalt in a tubular furnace according to the utility model, comprising a reactor 1, a modified asphalt circulation pump 2 and a tubular furnace 3, an insulation jacket 4 is provided on the side wall and the outer side of the bottom of the reactor 1, the insulation jacket 4 is multi-section and connected in series through pipelines, an expansion joint 8 is provided between the upper and lower adjacent insulation jackets 4, the expansion joint 8 is filled with elastic insulation material, a gap 9 is provided between the inner side of the insulation jacket 4 and the outer side of the side wall of the reactor 1, and the upper and lower ends of the gap 9 are sealed by insulation material to form a closed cavity; the bottom smoke inlet of the insulation jacket 4 on the lower side is connected to the smoke outlet of the tubular furnace 3, the smoke outlet of the insulation jacket 4 on the upper side is connected to the heat exchange medium inlet of the air preheater 6, the heat exchange medium outlet of the air preheater 6 is connected to the subsequent desulfurization and denitrification section, the air inlet of the air preheater 6 is connected to the air fan 5, and the air outlet of the air preheater 6 is connected to the combustion air inlet of the tubular furnace 3. The heat-insulating jacket 4 is provided with 3-10 sections, and the height of each section is 800-2500 mm.
[0024] A temperature recording control instrument TRC is provided on the pipeline of the smoke outlet of the uppermost insulation jacket 4. The smoke outlet of the uppermost insulation jacket 4 and the bottom smoke inlet of the lowermost insulation jacket 4 are connected through a bypass smoke pipe 10. A pressure differential regulating valve 7 is provided on the bypass smoke pipe 10. The pressure differential regulating valve 7 is interlocked with the temperature recording control instrument TRC. The pressure differential recording control instrument PDRC is used to detect and record the pressure differential value.
[0025] In the embodiment, the width of the expansion joint 8 is 80 mm. The width of the gap 9 is 50 mm. An independent insulation structure is provided on the top of the reactor 1. The reactor 1 is 10 meters high, and the insulation jacket 4 is provided with 4 sections, each section having a height of 2300 mm.
[0026] When the utility model is used, the high-temperature flue gas discharged from the tubular furnace is passed into the heat-insulating jacket of the reactor to isolate the influence of the ambient temperature on the heat dissipation of the reactor, reduce the heat dissipation of the reactor, and reduce the heat load of the tubular furnace. Taking the reactor 1 as a single reactor arrangement as an example, the specific control process is as follows:
[0027] 1) Making a thermal insulation jacket, a thermal insulation jacket 4 is provided on the outer side of the side wall and the bottom of the reactor 1, and the thermal insulation jacket is made in sections, and an expansion joint 8 is left between each section, and the expansion joint is filled with a soft and elastic thermal insulation material; the temperature of the flue gas discharged by the tubular furnace 3 is 800-1000°C, which is much higher than the reaction temperature of the reactor 1 of 380-400°C. In order to avoid direct contact, a gap 9 is left between the thermal insulation jacket 4 and the outer wall of the reactor 1, and the upper and lower ends of the gap 9 are sealed with thermal insulation materials to form a closed cavity. The air in the gap is heated by the thermal insulation jacket to play a role of heat insulation.
[0028] 2) Insulation of the top of the reactor: The top of the reactor 1 is independently insulated to meet the insulation requirements of the top of the reactor; the top of the reactor 1 is a gas phase space with less heat dissipation and contains more measuring instruments and process interfaces. The insulation is mainly to reduce the heat loss of the liquid phase.
[0029] 3) The flue gas pipelines are overlapped, and each section of the insulation jacket is connected in series through a flue gas pipe. The flue gas inlet of the lowest insulation jacket 4 is connected to the flue gas outlet of the tubular furnace 3, and the flue gas outlet of the uppermost insulation jacket 4 passes through the air preheater 6 to the desulfurization and denitrification section. A bypass flue gas pipe is set between the flue gas inlet of the lowest insulation jacket 4 and the flue gas outlet of the uppermost insulation jacket 4. During the asphalt modification process, the flue gas temperature at the insulation jacket outlet is controlled at 400°C.
[0030] The flue gas flowing out of the insulation jacket 4 is sent to the desulfurization and denitrification device after heat exchange with the air preheater 6 and the tubular furnace forced ventilation. The power for the flow of flue gas in the insulation jacket 4 comes from the induced draft fan of the desulfurization and denitrification device, and the pressure in the insulation jacket is -1 to -2 kPa.
[0031] The flue gas flow in the insulation jacket 4 is controlled by the insulation jacket bypass pressure differential regulating valve 7 according to the outlet flue gas temperature of the insulation jacket. When the outlet flue gas temperature of the insulation jacket is higher than 400°C, the inlet and outlet pressure differential of the pressure differential regulating valve is reduced, the pressure differential regulating valve is opened wider, the bypass flue gas flow is increased, and the flue gas flow of the insulation jacket is reduced; when it is lower than 350°C, the inlet and outlet pressure differential of the pressure differential regulating valve is increased, the pressure differential regulating valve is reduced in opening, the bypass flue gas flow is reduced, and the flue gas flow of the insulation jacket is increased.
[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An energy-saving device for heating modified asphalt in a tubular furnace, comprising a reaction kettle, a modified asphalt circulation pump and a tubular furnace, characterized in that: An insulation jacket is provided on the outer side of the side wall and the bottom of the reactor. The insulation jacket is composed of multiple sections and is connected in series through pipelines. An expansion joint is provided between the upper and lower adjacent insulation jackets, and the expansion joint is filled with elastic insulation material. A gap is provided between the inner side of the insulation jacket and the outer side of the side wall of the reactor, and the upper and lower ends of the gap are sealed by insulation material to form a closed cavity; the bottom smoke inlet of the lowermost insulation jacket is connected to the smoke outlet of the tubular furnace, and the smoke outlet of the uppermost insulation jacket is connected to the heat exchange medium inlet of the air preheater, the heat exchange medium outlet of the air preheater is connected to the subsequent desulfurization and denitrification section, the air inlet of the air preheater is connected to the air fan, and the air outlet of the air preheater is connected to the air inlet of the tubular furnace.
2. The energy-saving device for heating modified asphalt in a tubular furnace according to claim 1 is characterized in that: A temperature recording and controlling instrument is arranged on the pipeline of the smoke outlet of the uppermost insulation jacket, the smoke outlet of the uppermost insulation jacket and the bottom smoke inlet of the lowermost insulation jacket are connected through a bypass smoke pipe, a pressure differential regulating valve is arranged on the bypass smoke pipe, and the pressure differential regulating valve is interlocked with the temperature recording and controlling instrument for control.
3. The energy-saving device for heating modified asphalt in a tubular furnace according to claim 1, characterized in that: The width of the expansion joint is 50-100 mm.
4. The energy-saving device for heating modified asphalt in a tubular furnace according to claim 1, characterized in that: The width of the gap is 30-80 mm.
5. The energy-saving device for heating modified asphalt in a tubular furnace according to claim 1, characterized in that: The reactor is arranged as a single reactor or a double reactor.
6. The energy-saving device for heating modified asphalt in a tubular furnace according to claim 1, characterized in that: An independent heat-insulating structure is arranged on the top of the reactor.
7. The energy-saving device for heating modified asphalt in a tubular furnace according to claim 1, characterized in that: The heat-insulating jacket is provided with 3-10 sections, and the height of each section is 800-2500 mm.