Delayed coking process heat recovery device
By designing a heat recovery device for delayed coking process, the heat generated by the gas heat produced by the coke tower is used to heat raw materials and generate heat, which solves the problem of insufficient heat utilization during delayed coking, and achieves efficient heat utilization and fuel cost savings.
Patent Information
- Application Number
- CN202421431769.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-21
AI Technical Summary
Inadequate heat utilization during delayed coking will result in increased fuel costs and waste of heat.
A heat recovery device for delayed coking process is designed to heat the medium in the circulation pipeline through the gas overflowing from the top of the coke tower in the heat exchanger, which is then used to heat the raw materials in the tube heating furnace and to burn excess gas through the combustion chamber to generate heat.
The gas heat produced by the coke tower is effectively utilized, the dependence on purchased fuel is reduced, the heating cost is reduced, and the heat in the delayed coking process is fully utilized.
Smart Images
Figure CN222647890U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of energy recovery, in particular to a delayed coking process heat recovery device. Background Art
[0002] Delayed coking is a thermal cracking process, the main purpose of which is to convert heavy oil into light oil. Usually, heavy oil and residual oil are used as raw materials, and deep thermal cracking and condensation reactions are carried out at 500℃~600℃ to produce rich gas, crude gasoline, diesel, wax oil and coke. The delayed coking process is to heat the heavy oil products to the temperature required for the coking reaction through a tubular heating furnace, and make it quickly leave the heating furnace tube to undergo cracking and condensation reactions in the coke tower. The generated oil and gas escape from the top of the coke tower, and the generated coke remains in the tower. In this process, the coking reaction is postponed to the coke tower, so it is called delayed coking.
[0003] The vaporized products overflowing from the top of the coke tower usually enter the distillation tower for further separation, and the heavy coke and other non-vaporizable liquids will be deposited at the bottom of the tower. The overflowing vaporized products are often extremely hot, and even if they enter the distillation tower, they need to be cooled down in advance, and this part of the heat is actually wasted. In addition, before entering the coke tower, the raw materials need to be quickly heated to 500~600℃ in a tubular heating furnace, which is generally heated by burning fuel. The fuel currently used is purchased from outside, and low-carbon gas will also be generated during the coking reaction in the coke tower. The temperature reached when these gases are burned is enough to meet the requirements of the tubular heating furnace. If this part of the gas can be used, the fuel cost for heating can be saved. Utility Model Content
[0004] In view of the problem of insufficient heat utilization in the delayed coking process in the prior art, the utility model provides a delayed coking process heat recovery device to solve the above problem.
[0005] The technical solution of the utility model is as follows:
[0006] A delayed coking process heat recovery device comprises a coke tower; the top of the coke tower is connected to the gas inlet of a heat exchanger through a pipeline; the gas outlet of the heat exchanger is connected to the inlet of a fractionation tower through a second pipeline; the raw material inlet of the coke tower is connected to the material outlet of a tubular heating furnace; the material inlet of the tubular heating furnace is connected to the material outlet of a preheating tower through a pipeline; the gas outlet of the heat exchanger is connected to a combustion chamber on the tubular heating furnace through a first pipeline; the preheating tower is provided with an interlayer, the interlayer inlet of the preheating tower is connected to the medium outlet of the heat exchanger, and the medium outlet of the heat exchanger is connected to the interlayer inlet of the preheating tower to form a circulation pipeline.
[0007] Furthermore, metering pumps are provided on pipeline one and pipeline two.
[0008] Furthermore, the tubular heating furnace is a horizontal tubular heating furnace.
[0009] Furthermore, the medium in the circulation pipeline is heat transfer oil.
[0010] Furthermore, the number of combustion chambers is multiple.
[0011] Furthermore, valves are provided on the pipelines.
[0012] The working principle of the utility model is:
[0013] The gas overflowing from the top of the coke tower heats the medium in the circulation pipeline in the heat exchanger; the gas after heat exchange enters the combustion chamber from pipeline 1 to burn and generate heat to heat the raw materials in the tubular furnace. The excess gas enters the distillation tower to separate the components and store them. The medium heated in the heat exchanger will circulate to the preheating tower to heat the raw materials in the preheating tower, so that the raw materials entering the tubular heating furnace have a higher temperature and do not need too long for further heating.
[0014] The beneficial effects of the utility model are:
[0015] The delayed coking process heat recovery device provided by the utility model can utilize the heat of the gas produced by the coke tower to the material before entering the heating furnace, and the produced gas is burned to generate heat at the same time and used as fuel for the tubular heating furnace. In this way, the heat in the delayed coking process is fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 It is a structural schematic diagram of the utility model.
[0018] In the figure, 1-coke tower, 2-tubular heating furnace, 3-heat exchanger, 4-pipeline one, 5-combustion chamber, 6-preheating tower, 7-pipeline two, 8-distillation tower. DETAILED DESCRIPTION
[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0020] Example 1
[0021] A delayed coking process heat recovery device comprises a coke tower 1; the top of the coke tower 1 is connected to the gas inlet of a heat exchanger 3 through a pipeline; the gas outlet of the heat exchanger 3 is connected to the inlet of a distillation tower 8 through a pipeline 7; the raw material inlet of the coke tower 1 is connected to the material outlet of a tubular heating furnace 2; the material inlet of the tubular heating furnace 2 is connected to the material outlet of a preheating tower 6 through a pipeline; the gas outlet of the heat exchanger 3 is connected to a combustion chamber 5 on the tubular heating furnace 2 through a pipeline 4; the preheating tower 6 is provided with an interlayer, the interlayer inlet of the preheating tower 6 is connected to the medium outlet of the heat exchanger 3, and the medium outlet of the heat exchanger 3 is connected to the interlayer inlet of the preheating tower 6 to form a circulation pipeline, and the medium in the heat exchanger 3 can pass into the interlayer to preheat the raw material in the preheating tower 6.
[0022] Example 2
[0023] A delayed coking process heat recovery device comprises a coke tower 1; the top of the coke tower 1 is connected to the gas inlet of a heat exchanger 3 through a pipeline; the gas outlet of the heat exchanger 3 is connected to the inlet of a fractionating tower 8 through a pipeline 2 7; the raw material inlet of the coke tower 1 is connected to the material outlet of a tubular heating furnace 2; the tubular heating furnace 2 is a horizontal tubular heating furnace; the material inlet of the tubular heating furnace 2 is connected to the material outlet of a preheating tower 6 through a pipeline; the gas outlet of the heat exchanger 3 is connected to a combustion chamber 5 on the tubular heating furnace 2 through a pipeline 1 4; six combustion chambers 5 are provided; metering pumps are provided on the pipeline 1 4 and the pipeline 2 7; the preheating tower 6 is provided with an interlayer, the interlayer inlet of the preheating tower 6 is connected to the medium outlet of the heat exchanger 3, and the medium outlet of the heat exchanger 3 is connected to the interlayer inlet of the preheating tower 6 to form a circulation pipeline, the medium in the circulation pipeline is heat transfer oil, and the heat transfer oil can pass into the interlayer to preheat the raw materials in the preheating tower 6; valves are provided on the pipelines.
[0024] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.
Claims
1. A delayed coking process heat recovery device, comprising a coke drum; characterized in that: The top of the coke tower is connected to the gas inlet of the heat exchanger through a pipeline; the gas outlet of the heat exchanger is connected to the inlet of the distillation tower through pipeline 2; the raw material inlet of the coke tower is connected to the material outlet of the tubular heating furnace; the material inlet of the tubular heating furnace is connected to the material outlet of the preheating tower through a pipeline; the gas outlet of the heat exchanger is connected to the combustion chamber on the tubular heating furnace through pipeline 1; the preheating tower is provided with an interlayer, the interlayer inlet of the preheating tower is connected to the medium outlet of the heat exchanger, and the medium outlet of the heat exchanger is connected to the interlayer inlet of the preheating tower to form a circulation pipeline.
2. The delayed coking process heat recovery device according to claim 1, characterized in that: Metering pumps are provided on pipeline one and pipeline two.
3. The delayed coking process heat recovery device according to claim 1, characterized in that: The tubular heating furnace is a horizontal tubular heating furnace.
4. The delayed coking process heat recovery device according to claim 1, characterized in that: The medium in the circulation pipeline is heat transfer oil.
5. The delayed coking process heat recovery device according to claim 1, characterized in that: The combustion chamber is provided in plurality.
6. The delayed coking process heat recovery device according to claim 1, characterized in that: There are valves on the pipelines.