Energy-saving device for increasing feeding temperature of catalytic dry gas
By adding a heat exchanger between the catalytic dry gas and the reaction product, and adding valves to the benzene heat exchanger and condensation cooler pipelines, the problems of insufficient heat source utilization and low catalytic dry gas feed temperature in the prior art are solved, and the two-way utilization of heat and the increase of catalytic dry gas temperature are achieved, which reduces energy consumption and difficulty in cooling circulating water.
Patent Information
- Application Number
- CN202421998401.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-19
AI Technical Summary
In the prior art, the reaction product-benzene heat exchanger directly enters the reaction product condensation cooler for cooling and cooling, resulting in a large number of heat sources not being effectively utilized, increasing the difficulty of cooling circulating water, poor cooling effect, affecting the cooling effect of the overall circulating water cooler, and the catalytic dry gas feed temperature is low, increasing fuel gas usage and energy consumption.
In the process, the reaction product and catalytic dry gas heat exchanger are added to use it in series, and valves are added to the benzene heat exchanger and the reaction product condensation cooler pipeline to achieve cross-line effect, thereby increasing the temperature of the catalytic dry gas entering the reactor, reducing the medium temperature of the benzene into the reactor and the furnace temperature of the heating furnace, and reducing the fuel gas usage.
The two-way utilization of heat is achieved, the catalytic dry gas feed temperature is increased, the fuel gas consumption and energy consumption is reduced, the production is maintained, and the difficulty of circulating water cooling and the problem of cooler scale is reduced.
Smart Images
Figure CN222901072U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of petrochemical technologies, and in particular, to a device for energy-saving improvement of the feed temperature of catalytic dry gas. Background Art
[0002] In a fluid catalytic cracking unit, the feed process of catalytic dry gas involves multiple steps and considerations. First, fresh feedstock oil (vacuum gas oil) is pressurized and then heated to 300 - 350 °C by heat exchange with recycled slurry oil, and then enters the riser reactor through a nozzle. The feeding sequence is fresh feedstock, recycle oil, and recycle slurry oil in turn. In addition, regenerated catalyst enters the riser reactor from the bottom of the regenerator, while the spent catalyst enters the regenerator after passing through the stripping section of the settler. In the main air and flue gas flow, the spent catalyst contacts the main air in the regenerator bed, burns off the coke and then the regenerated catalyst is discharged. The flue gas carries a large amount of catalyst and rises to the dilute phase section. Most of the catalyst returns to the dense phase bed under the action of gravity, and a small amount of catalyst enters the cyclone separator with the flue gas for separation. The separated catalyst returns to the dense phase bed layer. The existing operation mode has the following disadvantages: 1. After heat exchange in the reaction product-benzene heat exchanger, the medium temperature is about 120 °C. If it directly enters the reaction product condensation cooler cooled by circulating water (circulating water temperature: about 30 °C) for cooling, the temperature difference between the two heat exchange media is too large, which is likely to cause corrosion and damage to the heat exchanger tube bundle. There have been multiple shutdowns for maintenance, making the production process unstable; 2. After heat exchange in the reaction product-benzene heat exchanger, the medium temperature is about 120 °C. If it directly enters the reaction product condensation cooler cooled by circulating water (circulating water temperature: about 30 °C) for cooling, the return water temperature of the circulating water is too high, increasing the cooling difficulty of the circulating water, and even affecting the cooling effect of the entire unit using circulating water for cooling, resulting in a vicious cycle of circulating water; 3. After heat exchange in the reaction product-benzene heat exchanger, the medium temperature is about 120 °C, which is too high, causing heat loss, not meeting the principle requirements of energy conservation and consumption reduction, and wasting resources; 4. After depropanization, the temperature of catalytic dry gas is relatively low (about 25 °C). There is an urgent need to increase the temperature. The medium temperature of benzene at the reactor inlet is on the high side, resulting in a large consumption of fuel gas in the heating furnace. This causes a large amount of fuel gas consumption and increases energy consumption; 5. After depropanization, the temperature of catalytic dry gas is relatively low (about 25 °C), and the dehydration effect is not good. The catalytic dry gas will carry a small amount of moisture into the reactor.
[0003] In the prior art, after heat exchange in the reaction product-benzene heat exchanger, it directly enters the reaction product condensation cooler for cooling, resulting in a large amount of heat sources not being effectively utilized. At the same time, it increases the difficulty of circulating water cooling, and the cooling effect is not good, which also affects the cooling effect of the overall circulating water cooler. For this reason, we propose a device for energy-saving improvement of the feed temperature of catalytic dry gas to solve the above problems. Utility Model Content
[0004] The object of the present utility model is to solve the disadvantages existing in the prior art that the reaction product - benzene heat exchanger directly enters the reaction product condensation cooler for cooling after heat exchange, resulting in a large amount of heat sources not being effectively utilized, increasing the difficulty of cooling with circulating water at the same time, and having poor cooling effect, which also affects the cooling effect of the overall circulating water cooler, and to propose a device for energy - saving and increasing the feed temperature of catalytic dry gas.
[0005] The device for energy - saving and increasing the feed temperature of catalytic dry gas provided by this application adopts the following technical solutions:
[0006] A device for energy - saving and increasing the feed temperature of catalytic dry gas, comprising:
[0007] A catalytic dry gas heat exchanger;
[0008] A third pipeline, the third pipeline is connected to the catalytic dry gas heat exchanger, a second pipeline is connected to the third pipeline, a first pipeline is connected to the second pipeline, and a benzene heat exchanger is connected to the first pipeline;
[0009] A fourth pipeline, the fourth pipeline is connected to the catalytic dry gas heat exchanger, a fifth pipeline is connected to the fourth pipeline, a sixth pipeline is connected to the fifth pipeline, a seventh pipeline is connected to the sixth pipeline, an eighth pipeline is connected to the seventh pipeline, a ninth pipeline is connected to the eighth pipeline, a tenth pipeline is connected to the ninth pipeline, and a cooler is connected to the tenth pipeline.
[0010] Further, a first valve and a fifth valve are connected between the first pipeline and the tenth pipeline, and the same second valve is connected to the first pipeline and the second pipeline.
[0011] Further, a thermometer is connected between the fifth pipeline and the sixth pipeline, the same third valve is connected to the seventh pipeline and the eighth pipeline, and the same fourth valve is connected to the ninth pipeline and the tenth pipeline.
[0012] Further, a thirteenth pipeline is connected to the catalytic dry gas heat exchanger, a twelfth pipeline is connected to the thirteenth pipeline, an eleventh pipeline is connected to the twelfth pipeline, and the same sixth valve is connected to the twelfth pipeline and the eleventh pipeline.
[0013] Further, a fourteenth pipeline is connected to the catalytic dry gas heat exchanger, a fifteenth pipeline is connected to the fourteenth pipeline, and the same seventh valve is connected to the fifteenth pipeline and the fourteenth pipeline.
[0014] In summary, this application includes at least one of the following beneficial technical effects:
[0015] 1. By adding a reaction product and catalytic dry gas heat exchanger between the benzene heat exchanger and the reaction product condenser cooler in this solution, and making them used in series in the process, the temperature of the catalytic dry gas entering the reactor is increased. At the same time, the excess heat is removed to reduce the burden on the subsequent system for cooling, achieving two-way utilization, which can not only maintain stable production during daily production operations but also effectively utilize heat.
[0016] 2. By installing valves on the pipelines of the benzene heat exchanger and the reaction product condenser cooler in this solution to play a cross-line role, the temperature of the catalytic dry gas entering the reactor can be increased, thereby reducing the temperature of the benzene medium entering the reactor, reducing the furnace temperature of the heating furnace for increasing the temperature of benzene, and ultimately reducing the consumption of fuel gas.
[0017] The utility model can effectively utilize low-temperature heat and ensure that important equipment affecting the safe production of the device is in good operating condition on the premise of ensuring safe production, reduce the unstable factors affecting the operation of the device, and at the same time reduce the energy consumption problems and inspection and maintenance costs generated during the operation of the device, which is conducive to the safe and stable operation of the device. Brief Description of the Drawings
[0018] Figure 1 It is a schematic structural diagram of a device for an energy-saving type to increase the temperature of catalytic dry gas feed proposed by the utility model.
[0019] Reference Numerals: 1, catalytic dry gas heat exchanger; 2, thermometer; 3, first valve; 4, second valve; 5, third valve; 6, fourth valve; 7, fifth valve; 8, sixth valve; 9, seventh valve; 10, first pipeline; 11, second pipeline; 12, third pipeline; 13, fourth pipeline; 14, fifth pipeline; 15, sixth pipeline; 16, seventh pipeline; 17, eighth pipeline; 18, ninth pipeline; 19, tenth pipeline; 20, eleventh pipeline; 21, twelfth pipeline; 22, thirteenth pipeline; 23, fourteenth pipeline; 24, fifteenth pipeline; 25, benzene heat exchanger; 26, cooler. Detailed Embodiments
[0020] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.
[0021] Refer to Figure 1 , an energy-saving type device for increasing the temperature of catalytic dry gas feed, comprising:
[0022] Catalytic dry gas heat exchanger 1;
[0023] The third pipeline 12 is connected to the catalytic dry gas heat exchanger 1. A second pipeline 11 is connected to the third pipeline 12. A first pipeline 10 is connected to the second pipeline 11. A benzene heat exchanger 25 is connected to the first pipeline 10.
[0024] The fourth pipeline 13 is connected to the catalytic dry gas heat exchanger 1. A fifth pipeline 14 is connected to the fourth pipeline 13. A sixth pipeline 15 is connected to the fifth pipeline 14. A seventh pipeline 16 is connected to the sixth pipeline 15. An eighth pipeline 17 is connected to the seventh pipeline 16. A ninth pipeline 18 is connected to the eighth pipeline 17. A tenth pipeline 19 is connected to the ninth pipeline 18. A cooler 26 is connected to the tenth pipeline 19. A first valve 3 and a fifth valve 7 are connected between the first pipeline 10 and the tenth pipeline 19. The same second valve 4 is connected to the first pipeline 10 and the second pipeline 11. A thermometer 2 is connected between the fifth pipeline 14 and the sixth pipeline 15. The same third valve 5 is connected to the seventh pipeline 16 and the eighth pipeline 17. The same fourth valve 6 is connected to the ninth pipeline 18 and the tenth pipeline 19. A thirteenth pipeline 22 is connected to the catalytic dry gas heat exchanger 1. A twelfth pipeline 21 is connected to the thirteenth pipeline 22. An eleventh pipeline 20 is connected to the twelfth pipeline 21. The same sixth valve 8 is connected to the twelfth pipeline 21 and the eleventh pipeline 20. A fourteenth pipeline 23 is connected to the catalytic dry gas heat exchanger 1. A fifteenth pipeline 24 is connected to the fourteenth pipeline 23. The same seventh valve 9 is connected to the fifteenth pipeline 24 and the fourteenth pipeline 23.
[0025] The implementation principle of the energy-saving device for increasing the inlet temperature of catalytic dry gas in the embodiment of the present application is as follows: during use, a reaction product and catalytic dry gas heat exchanger 1 is added between the original benzene heat exchanger 25 and the reaction product condensation cooler 26, and they are used in series in the process. At the same time, valves are added to the pipelines of the benzene heat exchanger 25 and the reaction product condensation cooler 26 to play a cross-line role, so as to increase the temperature of the catalytic dry gas entering the reactor, thereby reducing the temperature of the benzene medium entering the reactor, reducing the furnace temperature of the heating furnace for increasing the temperature of benzene, and ultimately reducing the fuel gas consumption. At the same time, it can also reduce the temperature of the medium before the reaction product enters the condensation cooler 26, reduce the scaling problem of the cooler 26, and the impact of the circulating water return temperature on the circulating water plant caused by the high temperature difference. A thermometer 2 is added at the outlet of the newly added reaction product catalytic dry gas heat exchanger 1 to facilitate checking the heat exchange effect and operating status, greatly improving the long-term operation of the device, reducing the energy consumption of the device operation at the same time, solving the damage to the equipment caused by the large temperature difference between high and low temperatures of the catalytic dry gas heat exchanger 1, ensuring the safe production operation, with simple process design, convenient operation, and flexible control.
[0026] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.
Claims
1. An energy-saving device for increasing the feed temperature of catalytic dry gas, characterized in that: include: Catalytic dry gas heat exchanger (1); a third pipeline (12), the third pipeline (12) being connected to the catalytic dry gas heat exchanger (1), the third pipeline (12) being connected to the second pipeline (11), the second pipeline (11) being connected to the first pipeline (10), and the first pipeline (10) being connected to the benzene heat exchanger (25); A fourth pipeline (13), the fourth pipeline (13) is connected to the catalytic dry gas heat exchanger (1), the fourth pipeline (13) is connected to a fifth pipeline (14), the fifth pipeline (14) is connected to a sixth pipeline (15), the sixth pipeline (15) is connected to a seventh pipeline (16), the seventh pipeline (16) is connected to an eighth pipeline (17), the eighth pipeline (17) is connected to a ninth pipeline (18), the ninth pipeline (18) is connected to a tenth pipeline (19), and the tenth pipeline (19) is connected to a cooler (26).
2. The energy-saving device for increasing the feed temperature of catalytic dry gas according to claim 1, characterized in that: The catalytic dry gas heat exchanger (1) is connected to a fourteenth pipeline (23), the fourteenth pipeline (23) is connected to a fifteenth pipeline (24), and the fifteenth pipeline (24) and the fourteenth pipeline (23) are connected to the same seventh valve (9).
3. The energy-saving device for increasing the feed temperature of catalytic dry gas according to claim 2, characterized in that: The catalytic dry gas heat exchanger (1) is connected to a thirteenth pipeline (22), the thirteenth pipeline (22) is connected to a twelfth pipeline (21), the twelfth pipeline (21) is connected to an eleventh pipeline (20), and the twelfth pipeline (21) and the eleventh pipeline (20) are connected to the same sixth valve (8).
4. The energy-saving device for increasing the feed temperature of catalytic dry gas according to claim 3, characterized in that: A first valve (3) and a fifth valve (7) are connected between the first pipeline (10) and the tenth pipeline (19), and the first pipeline (10) and the second pipeline (11) are connected to the same second valve (4).
5. The energy-saving device for increasing the feed temperature of catalytic dry gas according to claim 4, characterized in that: A thermometer (2) is connected between the fifth pipeline (14) and the sixth pipeline (15), the seventh pipeline (16) and the eighth pipeline (17) are connected to the same third valve (5), and the ninth pipeline (18) and the tenth pipeline (19) are connected to the same fourth valve (6).