A heat conducting oil tail gas recovery system
By using a heat transfer oil exhaust gas recovery system, which utilizes a demister, condenser, and scrubbing absorption tower, the problems of heat transfer oil waste and environmental pollution are solved, achieving resource recovery and environmentally compliant emissions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 内蒙古恒星化学有限公司
- Filing Date
- 2025-08-29
- Publication Date
- 2026-07-28
AI Technical Summary
Low-boiling-point components in heat transfer oil systems vaporize to form steam when operating at high temperatures, leading to waste of heat transfer oil, increased costs, and environmental pollution.
A heat transfer oil exhaust gas recovery system is adopted, including a demister, condenser and scrubbing absorption tower. The heat transfer oil components are recovered through the demister, condensation and scrubbing processes, and the system operation is controlled by level sensors and temperature sensors.
It reduces heat transfer oil consumption, lowers replenishment costs, reduces environmental pollution, meets environmental protection requirements, and ensures that exhaust emissions meet standards.
Smart Images
Figure CN224558454U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of exhaust gas treatment, and in particular to a heat transfer oil exhaust gas recovery system. Background Technology
[0002] In a heat transfer oil system operating at high temperatures, the heat transfer oil, after heat exchange at 50-70°C, returns to the heat transfer oil tank. However, during the high-temperature operating phase of the system (such as heaters and process heat exchange equipment, where temperatures are typically 200-350°C), the low-boiling-point components (such as residual C6-C12 light alkanes and solvents from production, with boiling points of 60-200°C) will vaporize from the liquid oil first, forming low-boiling-point vapors (small molecule hydrocarbons), because their boiling points are much lower than the operating temperature. At this point, these vapors are not directly discharged from the system. Instead, because the heat transfer oil is in a forced circulation state (driven by a circulation pump), they are carried along in the oil flow and participate in the circulation along with the heat transfer oil. They then enter the heat transfer oil tank and are discharged from the top of the tank. Currently, the discharged gas is directly sent to the exhaust gas treatment system for processing, resulting in a waste of heat transfer oil. Simultaneously, the amount of heat transfer oil in the system decreases over time, requiring replenishment and increasing costs. Utility Model Content
[0003] The main objective of this invention is to provide a heat transfer oil exhaust gas recovery system that recovers the components of the heat transfer oil, avoids waste of the heat transfer oil, thereby reducing the consumption of heat transfer oil in the system and lowering the cost of replenishing the heat transfer oil; it also reduces environmental pollution and meets environmental protection requirements.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a heat transfer oil tail gas recovery system, comprising a heat transfer oil tank, a demister, a condenser, and a scrubbing absorption tower; the outlet of the heat transfer oil tank is connected to the inlet of the demister, the outlet of the demister is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the scrubbing absorption tower, the liquid outlets of the demister, the condenser, and the scrubbing absorption tower are all connected to the liquid inlet of the heat transfer oil tank, the liquid outlet of the heat transfer oil tank is connected to the spray liquid inlet of the scrubbing absorption tower, and the liquid outlet of the scrubbing absorption tower is connected to the spray liquid inlet of the scrubbing absorption tower via a reflux pump.
[0005] Furthermore, a liquid level sensor is installed inside the washing and absorption tower, and a delivery pump is installed on the pipeline between the liquid outlet of the washing and absorption tower and the liquid inlet of the heat transfer oil tank; the signal output terminal of the liquid level sensor is connected to the signal input terminal of the controller via a signal connection, and the signal output terminal of the controller is connected to the signal input terminal of the delivery pump via a signal connection.
[0006] Furthermore, it also includes a circulating water inlet pipeline, a circulating water outlet pipeline, a regulating valve, and a temperature sensor; the circulating water inlet pipeline is connected to the cooling medium inlet of the condenser, the cooling medium outlet of the condenser is connected to the circulating water outlet pipeline, the regulating valve is installed on the circulating water inlet pipeline, and the temperature sensor is installed in the air outlet of the condenser; the signal output terminal of the temperature sensor is connected to the signal input terminal of the controller via a signal connection, and the signal output terminal of the controller is connected to the signal input terminal of the regulating valve via a signal connection.
[0007] This utility model has the following beneficial effects: This utility model has a simple and easy-to-implement connection structure. It recovers the components of the heat transfer oil through a demister, condenser, and scrubbing absorption tower, avoiding waste of the heat transfer oil and reducing the consumption of heat transfer oil in the system, thus lowering the cost of replenishing the heat transfer oil. The VOCs in the exhaust gas after heat transfer oil recovery meet the emission standards, so the gas discharged from the top of the scrubbing absorption tower can be directly vented, reducing environmental pollution and meeting environmental protection requirements. Attached Figure Description
[0008] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0009] Figure 1 This is a schematic diagram of the overall structure of a heat transfer oil exhaust gas recovery system according to this utility model.
[0010] In the diagram: 1. Heat transfer oil tank; 2. Demister; 3. Condenser; 4. Scrubbing absorption tower; 5. Circulating water inlet pipeline; 6. Circulating water outlet pipeline; 7. Regulating valve; 8. Temperature sensor; 9. Reflux pump; 10. Liquid level sensor; 11. Infusion pump; 12. Controller. Detailed Implementation
[0011] The following is in conjunction with the appendix Figure 1 The principles and features of this utility model are described, making the technical means, creative features, and achieved objectives of this utility model easy to understand, and further elaborating on this utility model.
[0012] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0014] like Figure 1 As shown, the technical solution adopted by this utility model is as follows: a heat transfer oil exhaust gas recovery system, which includes a heat transfer oil tank 1, a demister 2, a condenser 3, a scrubbing absorption tower 4, a circulating water inlet pipeline 5, a circulating water outlet pipeline 6, a regulating valve 7, and a temperature sensor 8; the outlet of the heat transfer oil tank 1 is connected to the inlet of the demister 2, the outlet of the demister 2 is connected to the inlet of the condenser 3, the outlet of the condenser 3 is connected to the inlet of the scrubbing absorption tower 4, the liquid outlets of the demister 2, the condenser 3, and the scrubbing absorption tower 4 are all connected to the liquid inlet of the heat transfer oil tank 1, the liquid outlet of the heat transfer oil tank 1 is connected to the spray liquid inlet of the scrubbing absorption tower 4, and the liquid outlet of the scrubbing absorption tower 4 is connected to the spray liquid inlet of the scrubbing absorption tower 4 through a reflux pump 9.
[0015] A liquid level sensor 10 is installed inside the washing absorption tower 4, and a liquid transfer pump 11 is installed on the pipeline between the liquid outlet of the washing absorption tower 4 and the liquid inlet of the heat transfer oil tank 1. The signal output terminal of the liquid level sensor 10 is connected to the signal input terminal of the controller 12 through a signal connection, and the signal output terminal of the controller 12 is connected to the signal input terminal of the liquid transfer pump 11 through a signal connection.
[0016] The circulating water inlet pipeline 5 is connected to the cooling medium inlet of the condenser 3, and the cooling medium outlet of the condenser 3 is connected to the circulating water outlet pipeline 6. A regulating valve 7 is installed on the circulating water inlet pipeline 5, and a temperature sensor 8 is installed in the air outlet of the condenser 3. The signal output terminal of the temperature sensor 8 is connected to the signal input terminal of the controller 12 via a signal connection, and the signal output terminal of the controller 12 is connected to the signal input terminal of the regulating valve 7 via a signal connection.
[0017] Working principle: The gas discharged from the top of the heat transfer oil tank 1 first enters the demister 2 to remove the mist droplets carried in the exhaust gas, and is then returned to the heat transfer oil tank 1. If these mist droplets are not removed in time, they may not only contain a certain amount of harmful substances, but also affect subsequent equipment. For example, they may adhere to the surface of the condenser 3, affecting the heat exchange efficiency, or enter the scrubbing absorption tower 4, interfering with the absorption effect. Therefore, the demister 2 provides a cleaner gas foundation for subsequent treatment and is an important prerequisite for ensuring the stable operation of the system.
[0018] After being demisted, the exhaust gas then enters condenser 3. Using condensation technology, the gaseous substances are converted into a liquid state. This process not only achieves preliminary recovery of useful substances and reduces resource waste, but also lowers the temperature of the exhaust gas, creating more suitable conditions for the subsequent heat transfer oil absorption. Therefore, the condensation stage, while recovering substances, also plays a role in regulating the gas state.
[0019] The system uses a temperature sensor 8 to constantly monitor the outlet of the condenser 3 and transmits the signal to the controller 12. By detecting the temperature, the size of the regulating valve 7 can be adjusted in real time, thereby regulating the operating status and ensuring the condensation effect. This further improves the stability and recovery efficiency of the entire system, truly achieving the dual goals of reducing pollutant emissions and improving resource utilization.
[0020] After condensation, although most of the substances have been recovered, a small amount of gaseous substances remain. Initially, the heat transfer oil is sprayed as a scrubbing liquid into the scrubbing absorption tower 4 from top to bottom to scrub the gas entering from below. Then, the heat transfer oil in the lower part of the scrubbing absorption tower 4 is circulated back to the top of the tower via the reflux pump 9. Utilizing the compatibility between the materials, the remaining gaseous substances are fully absorbed by the heat transfer oil, further improving the recovery rate of useful substances in the exhaust gas. This process significantly reduces the pollutant content in the emitted gas, ensuring that the final emitted gas meets environmental standards and can be safely discharged.
[0021] The liquid level sensor 10 continuously monitors the liquid level changes in the washing absorption tower 4 and transmits the signal to the controller 12. When the liquid level reaches the upper limit, the controller 12 controls the liquid pump 11 to turn on and deliver the heat transfer oil in the washing absorption tower 4 to the heat transfer oil tank 1 for reuse. When the liquid level reaches the lower limit (to meet the amount of circulating spray in the washing absorption tower 4), the liquid pump 11 is stopped.
[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A heat transfer oil exhaust gas recovery system, characterized in that, It includes a heat transfer oil tank, a demister, a condenser, and a scrubbing absorption tower; the outlet of the heat transfer oil tank is connected to the inlet of the demister, the outlet of the demister is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the scrubbing absorption tower, the liquid outlets of the demister, the condenser, and the scrubbing absorption tower are all connected to the liquid inlet of the heat transfer oil tank, the liquid outlet of the heat transfer oil tank is connected to the spray liquid inlet of the scrubbing absorption tower, and the liquid outlet of the scrubbing absorption tower is connected to the spray liquid inlet of the scrubbing absorption tower via a reflux pump.
2. The heat transfer oil exhaust gas recovery system according to claim 1, characterized in that, A liquid level sensor is installed inside the washing and absorption tower, and a delivery pump is installed on the pipeline between the liquid outlet of the washing and absorption tower and the liquid inlet of the heat transfer oil tank; the signal output terminal of the liquid level sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the delivery pump.
3. The heat transfer oil exhaust gas recovery system according to claim 2, characterized in that, It also includes a circulating water inlet pipeline, a circulating water outlet pipeline, a regulating valve, and a temperature sensor; the circulating water inlet pipeline is connected to the cooling medium inlet of the condenser, and the cooling medium outlet of the condenser is connected to the circulating water outlet pipeline; the regulating valve is installed on the circulating water inlet pipeline, and the temperature sensor is installed in the air outlet of the condenser; the signal output terminal of the temperature sensor is connected to the signal input terminal of the controller via a signal connection, and the signal output terminal of the controller is connected to the signal input terminal of the regulating valve via a signal connection.