Gas-phase heat-conducting oil recovery system
By using the ECS reactor and steam generator in the gas phase heat transfer oil recovery system in synergy, combined with catalytic combustion technology, the problem of ineffective recovery of gas phase heat transfer oil has been solved, realizing the recovery of heat energy and materials, reducing energy consumption and costs, and protecting the environment and the health of operators.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-21
AI Technical Summary
In existing technologies, vapor-phase heat transfer oil cannot be effectively recovered during the iron-molybdenum method of formaldehyde production, leading to environmental pollution, occupational health threats, and increased operating costs.
A gas-phase heat transfer oil recovery system is designed. Through the coordinated operation of an ECS reactor and a steam generator, combined with catalytic combustion technology, a closed-loop operation of the gas-phase medium is achieved. Organic matter is oxidized and decomposed using a platinum-palladium catalyst, and heat energy and material recovery are achieved through the cooperation of a turbine and a Roots blower.
It effectively eliminates material leakage, reduces equipment energy consumption, protects the environment and the health of operators, reduces heat transfer oil loss, and lowers operating costs.
Smart Images
Figure CN224141875U_ABST
Abstract
Description
Technical fields:
[0001] This utility model relates to the field of formaldehyde production, specifically to a vapor phase heat transfer oil recovery system. Background technology:
[0002] In the iron-molybdenum process for formaldehyde production, the main reaction involves methanol and oxygen reacting to produce formaldehyde and water, releasing heat in the process. This heat must be removed through a heat transfer oil system. The heat transfer oil system can also be controlled by top-stage segmentation to regulate the boiling point temperature of the heat transfer oil, thereby adjusting the reactor temperature and increasing the reaction temperature to compensate for catalyst activity. However, segmentation control requires pressurization with nitrogen followed by venting to achieve dynamic equilibrium and stabilize the reactor temperature.
[0003] The current process involves adding a jacketed heat exchanger to the venting pipeline, using a forced-circulation water cooling system to induce phase change and condensation of the vapor-phase heat transfer oil, thus recovering the oil phase substances to the storage tank. However, due to the turbulence effect and limited heat transfer efficiency of the large-diameter venting pipeline, a significant proportion of volatile oil phase components cannot be effectively captured. These released substances mainly cause three problems: first, the diffusion of benzene-containing organic compounds leads to environmental pollution around the plant; second, aerosolized heat transfer oil poses a threat to the occupational health and safety of workers; and third, the fugitive emission of oil phase substances causes heat transfer oil loss, increasing the operating costs of the unit. Utility Model Content:
[0004] The purpose of this invention is to provide a vapor phase heat transfer oil recovery system.
[0005] This utility model is implemented by the following technical solution:
[0006] A gas-phase heat transfer oil recovery system includes an ECS reactor and a steam generator. The inlet of the ECS reactor is connected to an inlet pipe, the outlet of the ECS reactor is connected to the tail gas inlet of the steam generator, and the tail gas outlet of the steam generator is connected to a tail gas pipe. The system also includes a heat transfer oil storage tank and a turbine. The vent of the heat transfer oil storage tank is connected to the inlet of a Roots blower, and the outlet of the Roots blower is connected to the inlet pipe. The inlet of the turbine is connected to the outlet of the ECS reactor, and the outlet of the turbine is connected to the tail gas inlet of the steam generator. The tail gas pipe is also connected to the heat source inlet of the preheater of the ECS reactor, and the heat source outlet of the preheater of the ECS reactor is connected to the tail gas pipe.
[0007] A temperature sensor is installed on the intake pipe; a preheating heat source inlet valve is installed at the preheater heat source inlet of the ECS reactor; and a preheating heat source exhaust valve is installed at the preheater heat source outlet of the ECS reactor. A vent valve is installed on the exhaust pipe connecting the preheater heat source inlet and the preheater heat source outlet of the ECS reactor. The signal output terminal of the temperature sensor is electrically connected to the signal input terminals of the preheating heat source inlet valve, the preheating heat source exhaust valve, and the vent valve, respectively.
[0008] Preferably, a pressure sensor is installed on the top of the heat transfer oil storage tank, and a vapor phase heat transfer oil discharge valve is installed on the pipeline between the Roots blower and the air inlet pipe. The signal input terminal of the pressure sensor is electrically connected to the signal input terminal of the vapor phase heat transfer oil discharge valve.
[0009] Preferably, a direct discharge valve is installed on the pipeline between the ECS reactor and the steam generator, and a power valve is installed on the pipeline between the ECS reactor and the turbine.
[0010] Advantages of this utility model:
[0011] The technical solution of co-feeding gaseous heat transfer oil and formaldehyde tail gas to the ECS reactor for catalytic combustion achieves closed-loop operation of the gaseous medium in the heat transfer oil system, effectively eliminating the escape of substances. It combines the oxidation and decomposition process of the escaped oil phase with the heat energy requirements of the formaldehyde unit, thereby reducing the energy consumption of the unit. Attached image description:
[0012] Figure 1 This is a schematic diagram of the structure of this utility model.
[0013] In the diagram: 1. ECS reactor; 2. Steam generator; 3. Inlet pipe; 4. Outlet pipe; 5. Heat transfer oil storage tank; 6. Turbine; 7. Roots blower; 8. Temperature sensor; 9. Preheating heat source inlet valve; 10. Preheating heat source outlet valve; 11. Vent valve; 12. Pressure sensor; 13. Gas phase heat transfer oil discharge valve; 14. Direct discharge valve; 15. Power valve. Detailed implementation method:
[0014] like Figure 1As shown, a gas-phase heat transfer oil recovery system includes an ECS reactor 1 and a steam generator 2. The inlet of the ECS reactor 1 is connected to an inlet pipe 3, the outlet of the ECS reactor 1 is connected to the tail gas inlet of the steam generator 2, and the tail gas outlet of the steam generator 2 is connected to a tail gas pipe 4. The system also includes a heat transfer oil storage tank 5 and a turbine 6. The vent of the heat transfer oil storage tank 5 is connected to the inlet of a Roots blower 7, and the outlet of the Roots blower 7 is connected to the inlet pipe 3. The inlet of the turbine 6 is connected to the outlet of the ECS reactor 1, and the outlet of the turbine 6 is connected to the tail gas inlet of the steam generator 2. The tail gas pipe 4 is also connected to the heat source inlet of the preheater of the ECS reactor 1, and the heat source outlet of the preheater of the ECS reactor 1 is connected to the tail gas pipe 4.
[0015] A temperature sensor 8 is installed on the intake pipe 3; a preheating heat source inlet valve 9 is installed at the preheater heat source inlet of the ECS reactor 1; and a preheating heat source exhaust valve 10 is installed at the preheater heat source outlet of the ECS reactor 1. An exhaust valve 11 is installed on the exhaust pipe 4 connecting the preheater heat source inlet and the preheater heat source outlet of the ECS reactor 1. The signal output terminal of the temperature sensor 8 is electrically connected to the signal input terminals of the preheating heat source inlet valve 9, the preheating heat source exhaust valve 10, and the exhaust valve 11, respectively.
[0016] After being pressurized by the Roots blower 7, the vapor-phase heat transfer oil in the heat transfer oil storage tank 5 is sent to the ECS reactor 1 along with the purified formaldehyde tail gas. The ECS reactor 1 uses a platinum-palladium catalyst to oxidize and decompose organic matter. Therefore, the exhaust gas containing vapor-phase heat transfer oil and the formaldehyde tail gas are catalytically oxidized and decomposed into water and carbon dioxide, releasing some heat. The decomposed tail gas first enters the formaldehyde unit blower system, where the turbine 6 provides power to the booster blower to pressurize the fresh air. Then it enters the steam generator 2 to produce by-product steam. Finally, it enters the preheater of the ECS reactor 1 to preheat the mixture of formaldehyde tail gas and vapor-phase heat transfer oil.
[0017] Temperature sensor 8 is used to detect the temperature of formaldehyde exhaust gas. If the purification system experiences abnormally high temperatures, temperature sensor 8 sends a signal to the preheating heat source inlet valve 9, the preheating heat source outlet valve 10, and the vent valve 11, controlling the vent valve 11 to open and the preheating heat source inlet valve 9 and the preheating heat source outlet valve 10 to close, preventing the exhaust gas from entering the preheater of ECS reactor 1. This reduces the temperature of the mixture of formaldehyde exhaust gas and gaseous heat transfer oil entering ECS reactor 1, thus preventing abnormally high temperatures in ECS reactor 1 and protecting the normal operation of the catalyst and connecting equipment. After the fault is cleared or temperature sensor 8 detects that the formaldehyde exhaust gas has returned to normal levels for a period of time, the vent valve 11 closes, and the preheating heat source inlet valve 9 and the preheating heat source outlet valve 10 open, allowing the mixture of formaldehyde exhaust gas and gaseous heat transfer oil to enter the preheater of ECS reactor 1 for further preheating.
[0018] A pressure sensor 12 is installed on the top of the heat transfer oil storage tank 5. A vapor phase heat transfer oil discharge valve 13 is installed on the pipeline between the Roots blower 7 and the air inlet pipe 3. The signal input terminal of the pressure sensor 12 is electrically connected to the signal input terminal of the vapor phase heat transfer oil discharge valve 13. The pressure sensor 12 is used to detect the pressure inside the heat transfer oil storage tank 5. If the pressure reaches the discharge value, the pressure sensor 12 sends a signal to the Roots blower 7 and the vapor phase heat transfer oil discharge valve 13. Both open, and the vapor phase heat transfer oil is sent to the ECS reactor 1.
[0019] A direct discharge valve 14 is installed on the pipeline between ECS reactor 1 and steam generator 2, and a power valve 15 is installed on the pipeline between ECS reactor 1 and turbine 6. During production operation, the power valve 15 is kept open to ensure the operation of turbine 6, which in turn drives the booster fan. If the booster fan is not required to operate, the power valve 15 is closed and the direct discharge valve 14 is opened, so that the reaction tail gas of ECS reactor 1 is directly sent to the by-product steam of steam generator 2.
[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A gas phase heat conducting oil recovery system comprising an ECS reactor and a steam generator, an air inlet of the ECS reactor being connected with an air inlet pipe, an air outlet of the ECS reactor being connected with a tail gas inlet of the steam generator, a tail gas outlet of the steam generator being connected with a tail gas pipe, characterized in that, It also includes a heat transfer oil storage tank and a turbine; the vent of the heat transfer oil storage tank is connected to the inlet of the Roots blower, and the outlet of the Roots blower is connected to the air inlet pipe; the air inlet of the turbine is connected to the exhaust port of the ECS reactor, and the exhaust port of the turbine is connected to the tail gas inlet of the steam generator; the tail gas pipe is also connected to the heat source inlet of the preheater of the ECS reactor, and the heat source outlet of the preheater of the ECS reactor is connected to the tail gas pipe; A temperature sensor is installed on the intake pipe; a preheating heat source inlet valve is installed at the preheater heat source inlet of the ECS reactor; and a preheating heat source exhaust valve is installed at the preheater heat source outlet of the ECS reactor. A vent valve is installed on the exhaust pipe connecting the preheater heat source inlet and the preheater heat source outlet of the ECS reactor. The signal output terminal of the temperature sensor is electrically connected to the signal input terminals of the preheating heat source inlet valve, the preheating heat source exhaust valve, and the vent valve, respectively.
2. A gas phase heat transfer oil recovery system according to claim 1, wherein A pressure sensor is installed on the top of the heat transfer oil storage tank, and a vapor phase heat transfer oil discharge valve is installed on the pipeline between the Roots blower and the air inlet pipe. The signal input terminal of the pressure sensor is electrically connected to the signal input terminal of the vapor phase heat transfer oil discharge valve.
3. A gas phase heat transfer oil recovery system according to claim 1 or 2, characterized in that A direct discharge valve is installed on the pipeline between the ECS reactor and the steam generator, and a power valve is installed on the pipeline between the ECS reactor and the turbine.