A multi-stage heat conducting oil heating system
By using a multi-stage heat transfer oil heating system, which utilizes steam and water media to heat the heat transfer oil in stages, the risks of pipe bursts and high equipment costs caused by the combustion of traditional fossil fuels have been solved, thus improving both safety and economy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU BOILER GRP CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-08-04
AI Technical Summary
In traditional thermal oil heating systems, the risk of pipe rupture accidents caused by the combustion of fossil fuels is high, and the equipment cost and energy waste are serious.
A multi-stage heat transfer oil heating system is adopted, which uses steam and water as mediums to heat the heat transfer oil in stages. The heat transfer oil is gradually transformed from superheated steam to unsaturated water through multi-stage heaters, which reduces the thermal stress of the heater tube sheet. Different grades of materials are used to reduce equipment costs.
It reduces the risk of pipe burst accidents, improves equipment safety, reduces energy waste, lowers equipment costs, and can adapt to load changes to achieve a stable heat source supply.
Smart Images
Figure CN224593790U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat transfer oil heating technology, and in particular to a multi-stage heat transfer oil heating system. Background Technology
[0002] Thermal transfer oil is a specialized product with good thermal stability used for indirect heat transfer. It not only boasts high heat transfer efficiency but also achieves high operating temperatures at near-normal pressure, providing a stable heat source as an intermediate medium. In processes such as chemical fiber manufacturing, refining, and fine chemicals, thermal transfer oil has always been a preferred heat transfer fluid.
[0003] Currently, in the process systems of industries such as chemical fiber, refining, and fine chemicals, heat transfer oil heat carriers mostly use traditional fossil energy (coal, oil, natural gas, etc.) combustion to heat the heat transfer oil. However, in the operation of traditional boilers, there is a risk of accidents caused by local overheating leading to coking of the heat transfer oil and resulting in tube rupture, causing negative economic and social impacts. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model designs a multi-stage thermal oil heating system that can replace traditional thermal oil furnaces that use fossil fuels such as coal, oil, and natural gas as fuel.
[0005] The present invention adopts the following technical solution:
[0006] A multi-stage heat transfer oil heating system includes a multi-stage heater. Each stage of the multi-stage heater includes a tube box, a tube sheet, a shell, a U-shaped heat exchange tube, and a partition plate. The tube sheet is fixed between the tube box and the shell. The tube box is divided into upper and lower parts by the partition plate. The U-shaped heat exchange tube is disposed in the shell, with both ends passing through the tube sheet and connecting the upper and lower parts of the tube box. The upper and lower parts of the tube box are respectively connected to the heat transfer oil outlet and the heat transfer oil inlet. The upper and lower ends of the shell are respectively connected to the heat exchange medium inlet and the heat exchange medium outlet. The heat transfer oil outlet and heat transfer oil inlet of adjacent heaters in the multi-stage heater are connected by pipelines. The heat exchange medium outlet and heat exchange medium inlet are also connected by pipelines. The heat transfer oil inlet of the final stage heater is connected to the heat transfer oil input pipeline. The heat transfer oil outlet of the primary heater is connected to the heat transfer oil output pipeline. The heat exchange medium inlet of the primary heater is connected to the heat exchange medium input pipeline. The heat exchange medium outlet of the final stage heater is connected to the heat exchange medium output pipeline.
[0007] Preferably, the multi-stage heater includes a primary heater, a secondary heater, and a tertiary heater. The tube-side space is formed by the inner side of the tube box, the tube sheet, and the inner side of the U-shaped heat exchange tubes; the shell-side space is formed by the inner side of the shell, the tube sheet, and the outer side of the U-shaped tubes. The tube-side space is filled with heat transfer oil, and the shell-side space is filled with steam and water in sequence. The tube side of the primary heater is divided into upper and lower sections by a partition; the tube side of the secondary heater is divided into upper and lower sections by a partition; and the tube side of the tertiary heater is divided into upper and lower sections by a partition.
[0008] Steam and water flow through the shell side, while heat transfer oil flows through the tube side. Steam changes from superheated steam to saturated steam through the shell side of the first-stage heater, from saturated steam to saturated water through the shell side of the second-stage heater, and from saturated water to unsaturated water through the shell side of the third-stage heater. Heat transfer oil enters from the inlet of the tube side of the third-stage heater, passes through the tube side of the third-stage heater, the tube side of the second-stage heater, and the tube side of the first-stage heater in sequence, and flows out from the outlet of the tube side of the first-stage heater.
[0009] Preferably, the multi-stage heaters are arranged in parallel side-by-side from top to bottom.
[0010] Preferably, the multi-stage heaters are fixedly installed using support plates.
[0011] Preferably, the heat exchange medium is water or steam.
[0012] The beneficial effects of this utility model are: (1) The multi-stage heating system of heat transfer oil provided by this invention replaces the heat transfer oil combustion furnace, thereby eliminating economic or safety risks such as combustion and explosion in the chemical fiber, petrochemical and other processes; (2) Steam and heat transfer oil are divided into a primary heater, a secondary heater and a tertiary heater, with three stages of heat exchange, reducing the temperature difference stress of the tube sheets of each stage heater, thereby increasing the safety of the heater; (3) With the adoption of tertiary heating, the secondary heater can use a lower grade material than the primary heater, and the tertiary heater can use a material of an even lower grade than the secondary heater, thereby reducing equipment costs; (4) During operation, the three-stage heaters are connected in series, making the temperature fluctuations and other factors more stable for each stage, and can better adapt to load changes; (5) When the process is shut down, the system can be in a hot standby state, keeping the temperature and pressure maintained, thereby avoiding the combustion furnace from running at a low load and causing energy waste. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model;
[0014] In the diagram: 1. Primary heater; 2. Secondary heater; 3. Tertiary heater; 11. Superheated steam pipeline; 12. Saturated steam pipeline; 13. Saturated water pipeline; 14. Subcooled water pipeline; 21. Heat transfer oil inlet pipeline; 22. Heat transfer oil connection pipeline one; 23. Heat transfer oil connection pipeline two; 24. Heat transfer oil outlet pipeline; 31. Primary heater heat exchanger tube; 32. Primary heater tube sheet; 33. Secondary heater heat exchanger tube; 34. Secondary heater tube sheet; 35. Tertiary heater heat exchanger tube; 36. Tertiary heater tube sheet; 41. Primary heater tube box; 42. Primary heater baffle; 43. Secondary heater tube box; 44. Secondary heater baffle; 45. Tertiary heater tube box; 46. Tertiary heater baffle; 51. Primary heater shell; 52. Secondary heater shell; 53. Tertiary heater shell. Detailed Implementation
[0015] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:
[0016] Example: Figure 1 As shown, a multi-stage heat transfer oil heating system includes a primary heater 1, a secondary heater 2, and a tertiary heater 3. The primary heater 1 includes: a primary heater tube box 41, a primary heater tube sheet 32, a primary heater shell 51, primary heater heat exchange tubes 31, a primary heater partition plate 42, and a support plate. The secondary heater 2 includes: a secondary heater tube box 43, a secondary heater tube sheet 34, a secondary heater shell 52, a secondary heater heat exchange tubes 33, a secondary heater partition plate 44, and a support plate. The tertiary heater 3 includes: a tertiary heater tube box 45, a tertiary heater tube sheet 36, a tertiary heater shell 53, a tertiary heater heat exchange tubes 35, a tertiary heater partition plate 46, and a support plate. The tube-side space is formed by the inner sides of each stage of the tube box, the tube sheet, and the U-shaped heat exchange tubes; the shell-side space is formed by the inner sides of each stage of the shell, the tube sheet, and the outer sides of the U-shaped heat exchange tubes. The tube-side spaces of the first-stage heater and the second-stage heater are connected by a heat transfer oil connecting pipeline 23, and the tube-side spaces of the second-stage heater and the third-stage heater are connected by a heat transfer oil connecting pipeline 22. The shell-side spaces of the first-stage heater and the second-stage heater are connected by a saturated steam pipeline 12, and the shell-side spaces of the second-stage heater and the third-stage heater are connected by a saturated water pipeline 13. The tube-side space of the first-stage heater uses heat transfer oil, and the shell-side space uses steam; the tube-side space of the second-stage heater uses heat transfer oil, and the shell-side space uses a steam / water mixture; the tube-side space of the third-stage heater uses heat transfer oil, and the shell-side space uses a mixture of steam and water, sequentially.
[0017] The outlet of the tube side space of the first-stage heater is connected to the heat transfer oil output pipeline 24, the inlet of the tube side space of the third-stage heater is connected to the heat transfer oil input pipeline 21, the inlet of the shell side space of the first-stage heater is connected to the hot steam pipeline 11, and the outlet of the shell side space of the third-stage heater is connected to the cold water pipeline 14.
[0018] In use, steam changes from superheated steam to saturated steam through the shell side of the first-stage heater, from saturated steam to saturated water through the shell side of the second-stage heater, and from saturated water to unsaturated water through the shell side of the third-stage heater; heat transfer oil enters from the inlet of the tube side of the third-stage heater, passes through the tube side of the third-stage heater, the tube side of the second-stage heater, and the tube side of the first-stage heater in sequence, and flows out from the outlet of the tube side of the first-stage heater.
[0019] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.
Claims
1. A multi-stage thermal oil heating system, characterized in that, It includes a multi-stage heater. Each stage of the multi-stage heater includes a tube box, tube sheet, shell, U-shaped heat exchange tubes, and partition plate. The tube sheet is fixed between the tube box and the shell. The tube box is divided into upper and lower parts by the partition plate. The U-shaped heat exchange tubes are installed in the shell. The two ends of the U-shaped heat exchange tubes pass through the tube sheet and connect to the upper and lower parts of the tube box. The upper and lower parts of the tube box are respectively connected to the heat transfer oil outlet and heat transfer oil inlet. The upper and lower ends of the shell are respectively connected to the heat exchange medium inlet and heat exchange medium outlet. The heat transfer oil outlet and heat transfer oil inlet of adjacent heaters in the multi-stage heater are connected by pipelines. The heat exchange medium outlet and heat exchange medium inlet are connected by pipelines. The heat transfer oil inlet of the final stage heater is connected to the heat transfer oil input pipeline. The heat transfer oil outlet of the primary heater is connected to the heat transfer oil output pipeline. The heat exchange medium inlet of the primary heater is connected to the heat exchange medium input pipeline. The heat exchange medium outlet of the final stage heater is connected to the heat exchange medium output pipeline.
2. The multi-stage heat transfer oil heating system according to claim 1, characterized in that, The multi-stage heater includes a primary heater, a secondary heater, and a tertiary heater.
3. The multi-stage heat transfer oil heating system according to claim 1, characterized in that, The multi-stage heaters are arranged in parallel rows from top to bottom.
4. The multi-stage heat transfer oil heating system according to claim 1, characterized in that, The multi-stage heaters are fixedly installed by support plates.
5. The multi-stage heat transfer oil heating system according to claim 1, characterized in that, The heat exchange medium is water or steam.