System for vaporizing methanol using exhaust heat

Abstract

The present application belongs to the technical field of fuel supply of combustion equipment, and particularly relates to a system for vaporizing methanol by using waste gas heat, which comprises a power engine, an air inlet pipeline and an exhaust pipeline arranged on the power engine, a methanol vaporizer arranged on the top of the power engine and matched with the air inlet pipeline, a waste gas heat exchanger arranged on the exhaust pipeline, a heat conducting oil inlet pipe and a heat conducting oil outlet pipe arranged between the waste gas heat exchanger and the methanol vaporizer, a heat conducting oil pump arranged on the heat conducting oil outlet pipe, a heat conducting oil bypass pipe arranged between the heat conducting oil inlet pipe and the heat conducting oil outlet pipe, and a heat conducting oil flow regulating unit arranged on the heat conducting oil inlet pipe, the heat conducting oil outlet pipe and the heat conducting oil bypass pipe in a matched mode. The present application can avoid the problems of liquid state agglomeration and condensation of methanol, and recycle and utilize the waste gas heat of the engine.

Description

Technical Field

[0001] This invention belongs to the field of fuel supply technology for combustion equipment, and specifically relates to a system for vaporizing methanol using the heat of waste gas. Background Technology

[0002] Methanol, as a clean alternative fuel, is widely used in the engine field. Currently, methanol fuel engines are mainly divided into two categories: methanol-diesel dual-fuel engines and pure methanol fuel engines. In the existing technology system, intake manifold injection is the mainstream methanol fuel supply method. However, due to the high latent heat of vaporization of methanol, the heat absorbed by methanol evaporation during injection causes a sharp drop in intake manifold temperature. This leads to the formation of liquid agglomerates of atomized methanol, which condense on the inner wall of the intake manifold. Consequently, the quality of the air-fuel mixture decreases, and the in-cylinder combustion phase is delayed. This not only reduces engine thermal efficiency and power output stability but also increases unburned methanol emissions.

[0003] Meanwhile, about 30%-40% of the energy released by the combustion of fuel in the engine is discharged as exhaust heat, which leads to a decrease in engine thermal efficiency and an increase in fuel consumption costs. The methanol vaporization process requires additional electricity or other energy, and the waste of exhaust heat will exacerbate secondary energy consumption, forming a vicious cycle of energy waste and additional energy consumption.

[0004] Chinese patent CN112902216A discloses a methanol vaporization device based on engine exhaust gas heating. The device includes a methanol tank and a methanol vaporization channel. The vaporization channel has a methanol inlet and a methanol gas outlet. The methanol inlet is connected to the methanol tank via pipe I, which is equipped with a one-way valve I. The methanol gas outlet is connected to pipe II, which is also equipped with a one-way valve II. The methanol vaporization channel is located inside the engine's exhaust pipe. This patent can collect heat from engine exhaust gas to produce hydrogen, improving engine thermal efficiency and reducing fuel consumption. However, this patent uses copper pipes as the methanol vaporization channel. During methanol vaporization, the volume expands, easily causing a sudden pressure increase inside the copper pipe, triggering water hammer and leading to leakage at the copper pipe joints. Furthermore, the methanol vaporization temperature of this patent is limited by the exhaust gas temperature, making it more suitable for engines operating in steady-state conditions, such as generator sets. For marine engines with frequently changing operating conditions, the large fluctuations in exhaust gas heat can lead to unstable methanol vaporization. Summary of the Invention

[0005] The purpose of this invention is to provide a system for vaporizing methanol using exhaust gas heat, which can avoid the problems of methanol liquid agglomeration and condensation caused by a sudden drop in intake temperature, ensure stable mixture quality and combustion phase, and recover and utilize engine exhaust gas heat to meet the methanol vaporization needs of frequent changing operating conditions such as ship engines.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: The system for vaporizing methanol using exhaust gas heat, as described in this invention, includes a power engine with an intake pipe and an exhaust pipe. A methanol vaporizer is mounted on the top of the power engine in conjunction with the intake pipe. An exhaust gas heat exchanger is mounted on the exhaust pipe. A heat transfer oil inlet pipe and a heat transfer oil outlet pipe are respectively provided between the exhaust gas heat exchanger and the methanol vaporizer. A heat transfer oil pump is mounted on the heat transfer oil outlet pipe. A heat transfer oil bypass pipe is provided between the heat transfer oil inlet pipe and the heat transfer oil outlet pipe. A heat transfer oil flow regulation unit is installed on the heat transfer oil outlet pipe and the heat transfer oil bypass pipe. The heat transfer oil flow regulation unit includes a temperature transmitter, a three-way regulating valve and a temperature controller. The temperature transmitter is installed on the heat transfer oil inlet pipe, and the three-way regulating valve is installed between the heat transfer oil outlet pipe and the heat transfer oil bypass pipe. The temperature transmitter, the three-way regulating valve and the heat transfer oil pump are all electrically connected to the temperature controller. The temperature controller has preset low temperature threshold, high temperature threshold, low temperature warning threshold and high temperature warning threshold.

[0007] Furthermore, the working process of the heat transfer oil flow regulation unit is as follows: the temperature transmitter detects the temperature of the heat transfer oil in the heat transfer oil inlet pipe in real time and transmits the temperature signal to the temperature controller. When the heat transfer oil temperature is ≤ the low temperature threshold, the temperature controller sends a command to the three-way regulating valve to increase the opening of the heat transfer oil outlet pipe into the exhaust gas heat exchanger, and at the same time decrease the opening of the heat transfer oil outlet pipe into the heat transfer oil bypass pipe, until the heat transfer oil temperature in the heat transfer oil inlet pipe is > the low temperature threshold; when the heat transfer oil temperature is ≥ the high temperature threshold, the temperature controller sends a command to the three-way regulating valve to decrease the opening of the heat transfer oil outlet pipe into the exhaust gas heat exchanger, and at the same time increase the opening of the heat transfer oil outlet pipe into the heat transfer oil bypass pipe, until the heat transfer oil temperature in the heat transfer oil inlet pipe is < the high temperature threshold.

[0008] Furthermore, the temperature transmitter monitors the temperature of the heat transfer oil in the inlet pipe in real time and transmits the temperature signal to the temperature controller. When the temperature of the heat transfer oil is ≤ the low temperature warning threshold, the temperature controller triggers a low temperature alarm and simultaneously sends a command to the three-way regulating valve to open the heat transfer oil outlet pipe and cut off the heat transfer oil bypass pipe. When the temperature of the heat transfer oil is ≥ the high temperature warning threshold, the temperature controller triggers a high temperature alarm and simultaneously sends a shutdown command to the heat transfer oil pump to stop the circulation of the heat transfer oil.

[0009] Furthermore, the exhaust gas heat exchanger is equipped with heat exchange tubes, which are arranged in multiple layers to fit the internal space of the exhaust gas heat exchanger. One end of the heat exchange tube is connected to the heat transfer oil inlet pipe, and the other end of the heat exchange tube is connected to the heat transfer oil outlet pipe.

[0010] Furthermore, the exhaust gas heat exchanger is equipped with several sets of heat exchange fins inside in conjunction with the heat exchange tubes. The heat exchange fins are arranged in a plate shape with several sets of heat exchange fins spaced apart. The surface of the heat exchange fins is coated with a heat-resistant coating, and the heat exchange tubes are arranged through several sets of heat exchange fins.

[0011] Furthermore, the methanol vaporizer is equipped with several vaporization chambers, and each vaporization chamber is equipped with a heat transfer oil pipe. One end of the heat transfer oil pipe is connected to the heat transfer oil inlet pipe, and the other end of the heat transfer oil pipe is connected to the heat transfer oil outlet pipe.

[0012] Furthermore, several sets of turbulence ribs are provided on the outer wall of the heat transfer oil pipeline along the axial direction of the heat transfer oil pipeline, and the turbulence ribs are arranged in a rectangular shape.

[0013] Furthermore, the heat transfer oil inlet pipe, heat transfer oil outlet pipe, and heat transfer oil bypass pipe are all equipped with insulation layers.

[0014] Furthermore, an expansion joint is installed on the exhaust pipe in conjunction with the exhaust gas heat exchanger. The expansion joint is corrugated and made of stainless steel.

[0015] Furthermore, the exhaust gas heat exchanger is equipped with cleaning and purging holes.

[0016] The beneficial effects of this invention are as follows: The exhaust pipe of the power engine recovers the heat of the high-temperature exhaust gas through the exhaust gas heat exchanger, and transfers it to the methanol vaporizer through the heat transfer oil inlet pipe. The heat transfer oil circulation replaces the traditional electric heating, preventing methanol liquid agglomeration and condensation, ensuring the stability of the air-fuel mixture quality and combustion phase in the power engine cylinder, and improving the thermal efficiency and power output stability of the power engine. The exhaust gas heat exchanger and the methanol vaporizer are connected by the heat transfer oil inlet and outlet pipes, converting the heat energy of the exhaust gas into the heat required for methanol vaporization, replacing the consumption of traditional electric energy or other energy sources, reducing energy waste and additional energy consumption, lowering fuel consumption costs, and improving energy utilization efficiency.

[0017] The heat transfer oil flow regulation unit monitors the temperature of the heat transfer oil in the inlet pipe in real time. By adjusting the three-way regulating valve, it controls the opening of the heat transfer oil outlet pipe and the heat transfer oil bypass pipe to achieve precise control of the methanol vaporization temperature. When the heat transfer oil temperature is abnormally low, a low temperature alarm mechanism is triggered, and the passage of the heat transfer oil outlet pipe into the exhaust gas heat exchanger is fully opened to ensure the supply of heat for methanol vaporization. When the heat transfer oil temperature is abnormally high, the heat transfer oil pump is automatically shut down to prevent the heat transfer oil from carbonizing at high temperatures. It can adapt to the exhaust gas heat fluctuations in scenarios with frequent changes in operating conditions, such as ship engines, to ensure stable methanol vaporization and prevent safety hazards caused by abnormal temperatures, thereby improving the operating safety of the power engine.

[0018] The heat exchange tubes are arranged in multiple layers within the exhaust gas heat exchanger. Within the limited space of the exhaust gas heat exchanger, this significantly increases the contact heat exchange path length between the heat transfer oil and the exhaust gas, extends the residence time of the heat transfer oil within the heat exchanger, ensures that the heat transfer oil fully absorbs the heat from the exhaust gas, and improves heat utilization efficiency. The heat exchange fins are arranged at intervals in conjunction with the heat exchange tubes. When the exhaust gas flows through the heat exchanger, the heat can be quickly transferred to the heat transfer oil in the heat exchange tubes through the heat exchange fins. At the same time, the heat exchange fins make the exhaust gas more evenly distributed within the heat exchanger, avoiding local overheating or insufficient heat exchange, and ensuring the stable operation of the subsequent methanol vaporizer.

[0019] The outer wall of the heat transfer oil pipe inside the methanol vaporizer is equipped with turbulence fins, which can enhance the turbulence of the methanol fluid, improve the heat exchange effect between the heat transfer oil and methanol, and accelerate the methanol vaporization rate. The surface of the heat exchange fins is coated with a high-temperature resistant coating to improve the heat exchange fins' resistance to high temperature and corrosion, prevent the heat exchange fins from being eroded by exhaust gas, ensure that the heat exchange fins can play a stable role in the long term, and improve the overall reliability and durability of the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the present invention with parts of the power engine, intake pipe, methanol vaporizer, vaporization chamber, heat transfer oil pipe, baffle fins and expansion joint removed. Figure 3 This is a schematic diagram of the waste gas heat exchanger and cleaning / purge holes in this invention; Figure 4 This is a partial structural schematic diagram of the waste gas heat exchanger, heat exchange tubes, and heat exchange fins in this invention. Figure 5 This is a schematic diagram of the heat exchange tube structure in this invention. Figure 1 ; Figure 6 This is a schematic diagram of the heat exchange tube structure in this invention. Figure 2 ; Figure 7 This is a schematic diagram of the structure of the heat exchange tube and heat exchange fins in this invention; Figure 8 This is a partial structural schematic diagram of the vaporization chamber, heat transfer oil pipe, and turbulence fins in this invention; Figure 9 This is a partial structural schematic diagram of the heat transfer oil pipe and the turbulence fins in this invention; In the picture: 1. Engine; 2. Intake pipe; 3. Exhaust pipe; 4. Methanol vaporizer; 5. Exhaust gas heat exchanger; 6. Heat transfer oil inlet pipe; 7. Heat transfer oil outlet pipe; 8. Heat transfer oil pump; 9. Heat transfer oil bypass pipe; 10. Temperature transmitter; 11. Heat exchange tube; 12. Vaporization chamber; 13. Heat transfer oil pipeline; 14. Baffle fins; 15. Expansion joint; 16. Three-way regulating valve; 17. Temperature controller; 18. Cleaning and purging port; 19. Heat exchange fins. Detailed Implementation

[0021] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0022] Example 1 like Figure 1-9 As shown, a system for vaporizing methanol using exhaust gas heat includes a power engine 1, an intake pipe 2 and an exhaust pipe 3. A methanol vaporizer 4 is mounted on the top of the power engine 1 in conjunction with the intake pipe 2. An exhaust gas heat exchanger 5 is mounted on the exhaust pipe 3. A heat transfer oil inlet pipe 6 and a heat transfer oil outlet pipe 7 are respectively installed between the exhaust gas heat exchanger 5 and the methanol vaporizer 4. A heat transfer oil pump 8 is installed on the heat transfer oil outlet pipe 7. A heat transfer oil bypass pipe 9 is installed between the heat transfer oil inlet pipe 6 and the heat transfer oil outlet pipe 7. The heat transfer oil inlet pipe 6 and the heat transfer oil... A heat transfer oil flow regulation unit is installed on the oil outlet pipe 7 and the heat transfer oil bypass pipe 9. The heat transfer oil flow regulation unit includes a temperature transmitter 10, a three-way regulating valve 16 and a temperature controller 17. The temperature transmitter 10 is installed on the heat transfer oil inlet pipe 6, and the three-way regulating valve 16 is installed between the heat transfer oil outlet pipe 7 and the heat transfer oil bypass pipe 9. The temperature transmitter 10, the three-way regulating valve 16 and the heat transfer oil pump 8 are all electrically connected to the temperature controller 17. The temperature controller 17 has preset low temperature threshold, high temperature threshold, low temperature warning threshold and high temperature warning threshold.

[0023] By constructing a fuel vaporization transmission path of "methanol vaporizer 4 and power engine 1" and cooperating with a heat recovery transmission path of "exhaust pipe 3, exhaust gas heat exchanger 5, heat transfer oil outlet pipe 7 and heat transfer oil inlet pipe 6", the combination of exhaust gas heat energy and methanol vaporization is realized, solving the problem of poor methanol atomization caused by sudden temperature drop in traditional methanol fuel engines and improving the quality of the air-fuel mixture; at the same time, the heat transfer oil flow regulation unit can achieve precise temperature control to adapt to the heat fluctuation requirements under different operating conditions.

[0024] The working process of the heat transfer oil flow regulation unit is as follows: the temperature transmitter 10 detects the temperature of the heat transfer oil in the heat transfer oil inlet pipe 6 in real time and transmits the temperature signal to the temperature controller 17. When the heat transfer oil temperature is ≤ the low temperature threshold, the temperature controller 17 sends a command to the three-way regulating valve 16 to increase the opening of the heat transfer oil outlet pipe 7 into the exhaust gas heat exchanger 5, and at the same time decrease the opening of the heat transfer oil outlet pipe 7 into the heat transfer oil bypass pipe 9, until the heat transfer oil temperature in the heat transfer oil inlet pipe 6 is > the low temperature threshold. When the heat transfer oil temperature is ≥ the high temperature threshold, the temperature controller 17 sends a command to the three-way regulating valve 16 to decrease the opening of the heat transfer oil outlet pipe 7 into the exhaust gas heat exchanger 5, and at the same time increase the opening of the heat transfer oil outlet pipe 7 into the heat transfer oil bypass pipe 9, until the heat transfer oil temperature in the heat transfer oil inlet pipe 6 is < the high temperature threshold.

[0025] The temperature transmitter 10, temperature controller 17, and three-way regulating valve 16 work together to achieve dynamic regulation of the heat transfer oil temperature. When the heat transfer oil temperature is below the low temperature threshold, the temperature controller 17 controls the three-way regulating valve 16 to increase the opening of the heat transfer oil outlet pipe 7, allowing more heat transfer oil to flow into the exhaust gas heat exchanger 5, fully absorbing the heat from the exhaust gas in the exhaust pipe 3, thereby increasing the temperature of the heat transfer oil returning to the heat transfer oil inlet pipe 6. When the heat transfer oil temperature is above the high temperature threshold, the temperature controller 17 controls the three-way regulating valve 16 to increase the opening of the heat transfer oil bypass pipe 9, allowing some heat transfer oil to flow directly back to the heat transfer oil inlet pipe 6 through the heat transfer oil bypass pipe 9, bypassing the exhaust gas heat exchanger 5 to avoid heating, thereby reducing the heat transfer oil temperature, ensuring the methanol vaporization process is stable and controllable, and improving the combustion efficiency and operational stability of the power engine 1.

[0026] Temperature transmitter 10 monitors the temperature of the heat transfer oil in the heat transfer oil inlet pipe 6 in real time and transmits the temperature signal to temperature controller 17. When the heat transfer oil temperature is ≤ low temperature warning threshold, temperature controller 17 triggers low temperature alarm and simultaneously sends a command to three-way regulating valve 16 to open heat transfer oil outlet pipe 7 and cut off heat transfer oil bypass pipe 9. When the heat transfer oil temperature is ≥ high temperature warning threshold, temperature controller 17 triggers high temperature alarm and simultaneously sends a shutdown command to heat transfer oil pump 8 to stop heat transfer oil circulation.

[0027] When the temperature of the heat transfer oil reaches the low-temperature warning threshold, the temperature controller 17 can promptly trigger an alarm, prompting the operator to check the heating capacity of the exhaust pipe 3 and the exhaust gas heat exchanger 5 in a timely manner. This prevents insufficient methanol vaporization due to excessively low heat transfer oil temperature and avoids problems such as incomplete combustion in the power engine 1. At the same time, the temperature controller 17 can control the three-way regulating valve 16 to fully open the heat transfer oil outlet pipe 7 and cut off the heat transfer oil bypass pipe 9, forcing all the heat transfer oil to flow through the exhaust gas heat exchanger 5 to absorb heat and ensure stable methanol vaporization. When the temperature of the heat transfer oil reaches the high-temperature warning threshold, the temperature controller 17 triggers a high-temperature alarm and stops the heat transfer oil pump 8, cutting off the heat transfer oil circulation. This prevents the heat transfer oil from being in a high-temperature state for a long time, which could lead to carbonization and coking. It also reduces the risk of overpressure explosion in the power engine 1 and improves the safety of equipment operation.

[0028] The exhaust gas heat exchanger 5 is equipped with heat exchange tubes 11. The heat exchange tubes 11 are arranged in multiple layers in conjunction with the internal space of the exhaust gas heat exchanger 5. One end of the heat exchange tubes 11 is connected to the heat transfer oil inlet pipe 6, and the other end of the heat exchange tubes 11 is connected to the heat transfer oil outlet pipe 7.

[0029] The exhaust gas heat exchanger 5 is equipped with several sets of heat exchange fins 19 inside the heat exchange tube 11. The heat exchange fins 19 are plate-shaped and several sets of heat exchange fins 19 are arranged at intervals. The surface of the heat exchange fins 19 is coated with a heat-resistant coating. The heat exchange tube 11 is installed through several sets of heat exchange fins 19.

[0030] The heat exchange fins 19 increase the heat exchange area, thereby improving the heat exchange efficiency between the high-temperature exhaust gas and the heat transfer oil. The high-temperature resistant coating enhances the corrosion resistance and oxidation resistance of the heat exchange fins 19, extends the service life of the exhaust gas heat exchanger 5, and ensures the long-term stable operation of the exhaust gas heat exchanger 5.

[0031] The methanol vaporizer 4 has several vaporization chambers 12 inside, and heat transfer oil pipes 13 are installed inside the vaporization chambers 12. One end of the heat transfer oil pipe 13 is connected to the heat transfer oil inlet pipe 6, and the other end of the heat transfer oil pipe 13 is connected to the heat transfer oil outlet pipe 7.

[0032] The heat transfer oil pipe 13 passes through the vaporization chamber 12, making the vaporization chamber 12 a heat transfer space, promoting the full vaporization of methanol, and improving the combustion performance of the power engine 1.

[0033] Several sets of turbulence ribs 14 are provided on the outer wall of the heat transfer oil pipe 13 along the axial direction of the heat transfer oil pipe 13. The turbulence ribs 14 are generally rectangular.

[0034] The turbulence fins 14 can increase the turbulence of the methanol fluid, enhance the heat exchange between methanol and the wall of the heat transfer oil pipe 13, improve the heat transfer efficiency, and make the methanol vaporization process more efficient and faster.

[0035] The heat transfer oil inlet pipe 6, the heat transfer oil outlet pipe 7, and the heat transfer oil bypass pipe 9 are all equipped with insulation layers. The insulation layers can reduce heat loss of the heat transfer oil during the transmission process, reduce heat loss, and at the same time prevent operators from being burned due to high temperature, thereby improving the safety of the device.

[0036] An expansion joint 15 is installed on the exhaust pipe 3 in conjunction with the exhaust gas heat exchanger 5. The expansion joint 15 is corrugated and made of stainless steel. The expansion joint 15 can absorb the stress generated by vibration during the operation of the power engine 1, prevent the exhaust pipe 3 from cracking or leaking due to stress concentration, and ensure the sealing and stability of the connection between the exhaust gas heat exchanger 5 and the exhaust pipe 3.

[0037] The exhaust gas heat exchanger 5 is equipped with a cleaning and purging hole 18. The cleaning and purging hole 18 can remove scale and impurities inside the exhaust gas heat exchanger 5, and prevent the heat exchange fins 19 from becoming clogged, which would lead to a decrease in heat exchange efficiency.

Claims

1. A system for vaporizing methanol using exhaust gas heat, comprising a power engine (1), wherein the power engine (1) is provided with an intake pipe (2) and an exhaust pipe (3), characterized in that, A methanol vaporizer (4) is installed on the top of the power engine (1) in conjunction with the intake pipe (2). An exhaust gas heat exchanger (5) is installed on the exhaust pipe (3). A heat transfer oil inlet pipe (6) and a heat transfer oil outlet pipe (7) are respectively installed between the exhaust gas heat exchanger (5) and the methanol vaporizer (4). A heat transfer oil pump (8) is installed on the heat transfer oil outlet pipe (7). A heat transfer oil bypass pipe (9) is installed between the heat transfer oil inlet pipe (6) and the heat transfer oil outlet pipe (7). Heat transfer oil is installed on the heat transfer oil inlet pipe (6), the heat transfer oil outlet pipe (7) and the heat transfer oil bypass pipe (9). The flow regulation unit includes a temperature transmitter (10), a three-way regulating valve (16), and a temperature controller (17). The temperature transmitter (10) is installed on the heat transfer oil inlet pipe (6), and the three-way regulating valve (16) is installed between the heat transfer oil outlet pipe (7) and the heat transfer oil bypass pipe (9). The temperature transmitter (10), the three-way regulating valve (16), and the heat transfer oil pump (8) are all electrically connected to the temperature controller (17). The temperature controller (17) has preset low temperature threshold, high temperature threshold, low temperature warning threshold, and high temperature warning threshold. The working process of the heat transfer oil flow regulation unit is as follows: the temperature transmitter (10) detects the temperature of the heat transfer oil in the heat transfer oil inlet pipe (6) in real time and transmits the temperature signal to the temperature controller (17). When the temperature of the heat transfer oil is less than or equal to the low temperature threshold, the temperature controller (17) sends a command to the three-way regulating valve (16) to increase the opening of the heat transfer oil outlet pipe (7) into the waste gas heat exchanger (5) and at the same time decrease the opening of the heat transfer oil outlet pipe (7) into the heat transfer oil bypass pipe (9) until the temperature of the heat transfer oil in the heat transfer oil inlet pipe (6) is greater than the low temperature threshold. When the temperature of the heat transfer oil is greater than or equal to the high temperature threshold, the temperature controller (17) sends a command to the three-way regulating valve (16) to decrease the opening of the heat transfer oil outlet pipe (7) into the waste gas heat exchanger (5) and at the same time increase the opening of the heat transfer oil outlet pipe (7) into the heat transfer oil bypass pipe (9) until the temperature of the heat transfer oil in the heat transfer oil inlet pipe (6) is less than the high temperature threshold.

2. The system for vaporizing methanol using waste gas heat according to claim 1, characterized in that, The temperature transmitter (10) detects the temperature of the heat transfer oil in the heat transfer oil inlet pipe (6) in real time and transmits the temperature signal to the temperature controller (17). When the temperature of the heat transfer oil is ≤ the low temperature warning threshold, the temperature controller (17) triggers a low temperature alarm and sends a command to the three-way regulating valve (16) to open the heat transfer oil outlet pipe (7) and cut off the heat transfer oil bypass pipe (9). When the temperature of the heat transfer oil is ≥ the high temperature warning threshold, the temperature controller (17) triggers a high temperature alarm and sends a shutdown command to the heat transfer oil pump (8) to stop the heat transfer oil circulation.

3. The system for vaporizing methanol using waste gas heat according to claim 1, characterized in that, The exhaust gas heat exchanger (5) is equipped with heat exchange tubes (11). The heat exchange tubes (11) are arranged in multiple layers in conjunction with the internal space of the exhaust gas heat exchanger (5). One end of the heat exchange tubes (11) is connected to the heat transfer oil inlet pipe (6), and the other end of the heat exchange tubes (11) is connected to the heat transfer oil outlet pipe (7).

4. The system for vaporizing methanol using waste gas heat according to claim 3, characterized in that, The exhaust gas heat exchanger (5) is equipped with several sets of heat exchange fins (19) inside the heat exchange tube (11). The heat exchange fins (19) are arranged in a plate shape and several sets of heat exchange fins (19) are arranged at intervals. The surface of the heat exchange fins (19) is coated with a heat-resistant coating. The heat exchange tube (11) passes through several sets of heat exchange fins (19).

5. The system for vaporizing methanol using waste gas heat according to claim 1, characterized in that, The methanol vaporizer (4) has several vaporization chambers (12) inside. The vaporization chambers (12) are equipped with heat transfer oil pipes (13). One end of the heat transfer oil pipe (13) is connected to the heat transfer oil inlet pipe (6), and the other end of the heat transfer oil pipe (13) is connected to the heat transfer oil outlet pipe (7).

6. The system for vaporizing methanol using waste gas heat according to claim 5, characterized in that, Several sets of turbulence ribs (14) are provided on the outer wall of the heat transfer oil pipe (13) along the axial direction of the heat transfer oil pipe (13), and the turbulence ribs (14) are arranged in a rectangular shape.

7. The system for vaporizing methanol using waste gas heat according to claim 1, characterized in that, The heat transfer oil inlet pipe (6), the heat transfer oil outlet pipe (7), and the heat transfer oil bypass pipe (9) are all equipped with heat insulation layers.

8. The system for vaporizing methanol using waste gas heat according to claim 1, characterized in that, An expansion joint (15) is installed on the exhaust pipe (3) in conjunction with the waste gas heat exchanger (5). The expansion joint (15) is corrugated and is made of stainless steel.

9. The system for vaporizing methanol using waste gas heat according to claim 1, characterized in that, The exhaust gas heat exchanger (5) is equipped with a cleaning and purging hole (18).

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