Methanol catalytic combustion heat supply and hydrogen production thermal management system

Abstract

The invention belongs to the technical field of hydrogen energy equipment. The invention provides a methanol catalytic combustion heat supply and hydrogen production thermal management system, which comprises a combustor, a heat transfer shell, a catalytic combustion pipe, a heat conduction oil pipe, a first temperature measurement TE, a second temperature measurement TE and a third temperature measurement TE; the fuel conveying mechanism comprises a fuel pump, an air compressor, a first check valve and a second check valve; the hot oil circulating mechanism comprises a hot oil circulating pump, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve and a hot oil buffer tank; the control mechanism comprises an MCU, a pump controller, a valve controller and a temperature collector; and an algorithm I and an algorithm II are embedded in the MCU and are respectively a fuel pump feeding algorithm and a hot oil circulating pump flow speed algorithm. It can be ensured that heat is conveyed to all parts of the combustor, and the combustor evenly releases heat.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrogen energy equipment, and particularly relates to a methanol catalytic combustion heat supply hydrogen production heat management system. BACKGROUND

[0002] The efficient and clean hydrogen energy replaces fossil energy such as coal and oil, and is a good way to achieve carbon peak and carbon neutralization. The methanol reforming hydrogen production is a common way of hydrogen production. The methanol reforming hydrogen production is an endothermic reaction, and heat needs to be supplied externally in the process of hydrogen production. At present, the heat supply modes include the following: an external boiler uses heat-conducting oil to supply heat to the methanol reforming hydrogen production reactor at a long distance, a catalytic combustor catalytically combusts to directly supply heat to the methanol reforming hydrogen production reactor, and industrial tail gas steam waste heat supplies the methanol reforming hydrogen production reactor. Among them, the catalytic combustor is a relatively good heat supply mode for the methanol reforming hydrogen production due to its small heat loss and convenience for integration.

[0003] However, since the CU / Zn / Al catalyst is used in the methanol reforming hydrogen production, the general reaction temperature is 230 DEG C to 300 DEG C, and local heating easily forces the catalyst to sinter, thereby reducing the reaction efficiency of methanol. The methanol catalytic combustion heat supply has the problem of local hot spots, and it is difficult to directly couple the methanol reforming hydrogen production system. The patent CN117326526A provides a methanol reforming hydrogen production system and method based on catalytic combustion, and proposes the coupling of two reaction processes. However, the structure of the internal catalytic reactor of the coupling is not explicitly pointed out, and how the two reactors are coupled to eliminate the problem of uneven heat transfer is not pointed out.

[0004] However, in actual production, the catalytic combustion system and the methanol reforming hydrogen production need to be coupled to uniformly transfer heat. Therefore, it is necessary and valuable to intelligently control the heat oil circulation mechanism to solve the problems of hot spots and uneven heat transfer of the catalytic combustor. SUMMARY

[0005] In view of the above problems, the application provides a methanol catalytic combustion heat supply hydrogen production heat management system, which ensures that heat is transported to each part of the combustor, so that the combustor uniformly releases heat.

[0006] To achieve the above purpose, the technical scheme adopted by the application is as follows: A methanol catalytic combustion heat supply hydrogen production heat management system, comprising: A combustor comprising a heat transfer shell, a catalytic combustion pipe penetrating through the center of the heat transfer shell, a heat-conducting oil pipe arranged in the heat transfer shell, the heat-conducting oil pipe having one heat-conducting oil inlet and one heat-conducting oil outlet, and a first temperature measuring element TE, a second temperature measuring element TE and a third temperature measuring element TE arranged on the heat transfer shell; The fuel delivery mechanism includes a fuel pump, an air compressor, a first check valve, and a second check valve; the rear end of the fuel pump is connected to the first check valve, the rear end of the air compressor is connected to the second check valve, and the first check valve and the second check valve are connected to the catalytic combustion tube through a pipeline. The hot oil circulation mechanism includes a hot oil circulation pump, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, and a hot oil buffer tank; one end of the hot oil circulation pump is connected to the heat transfer oil inlet, and the other end of the hot oil circulation pump is connected to the first pneumatic valve and the third pneumatic valve; the other end of the third pneumatic valve is connected to the hot oil buffer tank, one end of the second pneumatic valve is connected to the hot oil buffer tank, and the other ends of the second pneumatic valve and the other ends of the first pneumatic valve are connected to the heat transfer oil outlet; The control mechanism includes an MCU, a pump controller, a valve controller, and a temperature acquisition device; the MCU has embedded Algorithm 1 and Algorithm 2, which are the fuel pump feed algorithm and the hot oil circulation pump flow rate algorithm, respectively.

[0007] Furthermore, the heat-conducting oil pipes are distributed in a serpentine pattern on all four sides inside the heat transfer shell, and are interconnected on all four sides.

[0008] Furthermore, the temperature acquisition device, valve controller, and pump controller are connected to the MCU via RS485 or TPC communication.

[0009] Furthermore, the temperature acquisition device simultaneously acquires three temperature information channels, the valve controller controls multiple pneumatic valves, and the pump controller controls multiple pumps.

[0010] Furthermore, the fuel pump feeding algorithm is a single-temperature-point PID algorithm for the second temperature measurement TE.

[0011] Furthermore, the user sets the desired temperature threshold, and the temperature return value is the test value of the second temperature measuring TE. The return value is compared with the threshold and returned to the MCU. The MCU provides the values ​​of the proportional term Kp, integral term Ki, and derivative term Kd. The MCU issues instructions to control the fuel pump feed flow rate, and the air compressor intake flow rate is automatically adjusted to follow the fixed ratio of fuel.

[0012] Furthermore, the hot oil circulation pump flow rate algorithm is a multi-temperature point difference PID algorithm using the first temperature measurement TE, the second temperature measurement TE, and the third temperature measurement TE.

[0013] Furthermore, the user sets the maximum temperature distribution difference allowed in the system as a threshold value (the temperature value here only needs to meet the requirements of hydrogen production temperature distribution). The absolute values ​​of the temperature differences at the first temperature measurement point TE, the second temperature measurement point TE, and the third temperature measurement point TE are compared to obtain the maximum value. The maximum value is compared with the set threshold value and returned to the MCU. The MCU provides the values ​​of the proportional term Kp, the integral term Ki, and the derivative term Kd. The MCU issues instructions to control the flow rate of the hot oil circulation pump, so as to realize the heat transport to all parts of the burner and make the burner release heat evenly.

[0014] Furthermore, the burner is manufactured in a modular manner, and the manufacturing methods include casting, 3D printing, additive manufacturing by machine tooling, or subtractive manufacturing.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention transmits data to the MCU via a temperature acquisition device, calculates the fuel pump feed rate using a single-temperature-point PID algorithm, and outputs the control pump feed flow rate. This achieves intelligent regulation between methanol and the set temperature, effectively increasing the accuracy of temperature control and saving methanol fuel.

[0016] This invention transmits data to the MCU via a temperature acquisition device, calculates the flow rate of the hot oil circulation pump using a multi-temperature measurement point difference PID algorithm, and outputs the control of the hot oil circulation pump flow rate to achieve uniform temperature distribution on the burner and eliminate the phenomenon of overheating and catalyst sintering. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the methanol catalytic combustion heating hydrogen production thermal management system of the present invention; Figure 2 This is a perspective view of the burner of the present invention from one angle; Figure 3 This is a perspective view of the burner of the present invention from another angle; Figure 4 This is a schematic diagram of the internal structure of the burner of the present invention.

[0018] 1. Burner; 1.1. First temperature measuring device (TE); 1.2. Second temperature measuring device (TE); 1.3. Third temperature measuring device (TE); 1.4. Catalytic combustion tube; 1.5. Heat transfer oil pipe; 1.6. Heat transfer oil inlet; 1.7. Heat transfer oil outlet; 1.8. Heat transfer shell; 2. Fuel delivery mechanism; 2.1 Fuel pump; 2.2 Air compressor; 2.3 First check valve; 2.4 Second check valve; 3. Hot oil circulation mechanism; 3.1 Hot oil circulation pump; 3.2 First pneumatic valve; 3.3 Second pneumatic valve; 3.4 Third pneumatic valve; 3.5 Hot oil buffer tank; 4. Control mechanism; 4.1 MCU; 4.2 Pump controller; 4.3 Valve controller; 4.4 Temperature acquisition device. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-4 As shown, a methanol catalytic combustion heating and hydrogen production thermal management system includes a burner 1, a fuel delivery mechanism 2, a hot oil circulation mechanism 3, and a control mechanism 4.

[0021] The burner 1 includes a heat transfer shell 1.8, with a catalytic combustion tube 1.4 running through its center. A heat transfer oil pipe 1.5 is installed inside the heat transfer shell 1.8, with only one heat transfer oil inlet 1.6 and one heat transfer oil outlet 1.7. A first temperature sensor TE1.1, a second temperature sensor TE1.2, and a third temperature sensor TE1.3 are installed on the heat transfer shell 1.8. The heat transfer oil pipe 1.5 is distributed in a serpentine pattern on all four sides inside the heat transfer shell 1.8, and all four sides are interconnected.

[0022] The burner 1 is manufactured using 3D printing additive manufacturing. The preferred materials for the catalytic combustion tube 1.4 are 316L stainless steel and the heat transfer shell 1.8 is pure copper, which has good heat transfer performance. For small catalytic combustion systems, the inner diameter of the combustion tube can be 8-10 mm and the length can be 120 mm. The heat transfer shell 1.8 can be a 100*140*140 mm cuboid. The heat transfer oil tube 1.5 can be a channel with a diameter of 3 mm. The three temperature measuring points are channels for placing thermocouples with a diameter of 1 mm.

[0023] The fuel delivery mechanism 2 includes a fuel pump 2.1, an air compressor 2.2, a first check valve 2.3, and a second check valve 2.4. The rear end of the fuel pump 2.1 is connected to the first check valve 2.3, and the rear end of the air compressor 2.2 is connected to the second check valve 2.4. The first check valve 2.3 and the second check valve 2.4 are connected to the catalytic combustion tube 1.4 through a pipeline.

[0024] Fuel pump 2.1 can be a peristaltic pump, plunger pump, or centrifugal pump, with a control signal of 4-20mA analog quantity; the specific range is selected based on actual needs. Air compressor 2.2 is an adjustable air compressor, also with a control signal of 4-20mA analog quantity; the range is selected based on the actual system requirements. The first check valve 2.3 and the second check valve 2.4 are both made of 316L stainless steel with an alcohol-resistant corrosion-resistant structure. The piping is also made of 316L stainless steel.

[0025] The hot oil circulation mechanism 3 includes a hot oil circulation pump 3.1, a first pneumatic valve 3.2, a second pneumatic valve 3.3, a third pneumatic valve 3.4, and a hot oil buffer tank 3.5. One end of the hot oil circulation pump 3.1 is connected to the heat transfer oil inlet 1.6, and the other end of the hot oil circulation pump 3.1 is connected to the first pneumatic valve 3.2 and the third pneumatic valve 3.4. The other end of the third pneumatic valve 3.4 is connected to the hot oil buffer tank 3.5. One end of the second pneumatic valve 3.3 is connected to the hot oil buffer tank 3.5, and the other ends of the second pneumatic valve 3.3 and the first pneumatic valve 3.2 are connected to the heat transfer oil outlet 1.7.

[0026] In the hot oil circulation mechanism 3, the advantages of heat transfer oil in improving uniform heat transfer are utilized. The preferred heat transfer oil is dimethyl silicone oil. The first pneumatic valve 3.2, the second pneumatic valve 3.3, and the third pneumatic valve 3.4 are preferably high-temperature resistant pneumatic valves with an opening pressure of 4-5 bar. The preferred hot oil circulation pump 3.1 is a high-temperature centrifugal pump (temperature resistant to 400℃) with a control signal of 4-20 mA. In order to reduce heat loss, the hot oil buffer tank 3.5, the hot oil circulation pipeline, and the valves therein are all insulated with heat-insulating materials.

[0027] The control mechanism 4 includes MCU 4.1, pump controller 4.2, valve controller 4.3 and temperature acquisition device 4.4; MCU 4.1 has embedded algorithm 1 and algorithm 2, which are fuel pump 2.1 feed algorithm and hot oil circulation pump 3.1 flow rate algorithm, respectively.

[0028] MCU4.1 uses a microcontroller (STM32 series microcontroller), industrial control PLC, pump controller 4.2 signal conversion is TPC signal to 4-20 mA signal, valve controller 4.3 signal conversion is TPC signal to switch signal, and temperature acquisition device 4.4 signal conversion is thermocouple signal to TPC.

[0029] The fuel pump 2.1 feed algorithm is a single-temperature-point PID algorithm of the second temperature measurement TE1.2. The user sets the desired temperature threshold, and the temperature return value is the test value of the second temperature measurement TE1.2. The return value is compared with the threshold and returned to MCU4.1. MCU4.1 provides the values ​​of proportional term Kp, integral term Ki, and derivative term Kd. MCU4.1 issues instructions to control the feed flow of fuel pump 2.1. The air compressor 2.2 intake flow is set and automatically adjusted to a fixed ratio with the fuel.

[0030] The flow rate algorithm for the hot oil circulation pump 3.1 is a multi-temperature point difference PID algorithm based on the first temperature measurement point TE1.1, the second temperature measurement point TE1.2, and the third temperature measurement point TE1.3. The user sets the maximum allowable temperature distribution difference in the system as the threshold (the temperature value here only needs to meet the hydrogen production temperature distribution requirements). The absolute values ​​of the temperature differences between the three temperature measurement points TE1.1, TE1.2, and TE1.3 are compared to obtain the maximum value. The maximum value is compared with the set threshold and returned to MCU4.1. MCU4.1 provides the values ​​of the proportional term Kp, integral term Ki, and derivative term Kd. MCU4.1 issues instructions to control the flow rate of the hot oil circulation pump 3.1, realizing the heat transport to various parts of burner 1, so that burner 1 can release heat evenly.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A methanol catalytic combustion heating and hydrogen production thermal management system, characterized in that, include: The burner (1) includes a heat transfer shell (1.8), a catalytic combustion tube (1.4) is disposed through the center of the heat transfer shell (1.8), a heat transfer oil pipe (1.5) is disposed inside the heat transfer shell (1.8), the heat transfer oil pipe (1.5) has a heat transfer oil inlet (1.6) and a heat transfer oil outlet (1.7), and a first temperature measuring device (TE) (1.1), a second temperature measuring device (TE) (1.2) and a third temperature measuring device (TE) (1.3) are disposed on the heat transfer shell (1.8). The fuel delivery mechanism (2) includes a fuel pump (2.1), an air compressor (2.2), a first check valve (2.3), and a second check valve (2.4); the fuel pump (2.1) is connected to the first check valve (2.3) at its rear end, and the air compressor (2.2) is connected to the second check valve (2.4) at its rear end; the first check valve (2.3) and the second check valve (2.4) are connected to the catalytic combustion tube (1.4) through a pipeline. The hot oil circulation mechanism (3) includes a hot oil circulation pump (3.1), a first pneumatic valve (3.2), a second pneumatic valve (3.3), a third pneumatic valve (3.4), and a hot oil buffer tank (3.5); one end of the hot oil circulation pump (3.1) is connected to the heat transfer oil inlet (1.6), and the other end of the hot oil circulation pump (3.1) is connected to the first pneumatic valve (3.2) and the third pneumatic valve (3.4); the other end of the third pneumatic valve (3.4) is connected to the hot oil buffer tank (3.5), one end of the second pneumatic valve (3.3) is connected to the hot oil buffer tank (3.5), and the other ends of the second pneumatic valve (3.3) and the first pneumatic valve (3.2) are connected to the heat transfer oil outlet (1.7); The control mechanism (4) includes an MCU (4.1), a pump controller (4.2), a valve controller (4.3), and a temperature acquisition device (4.4); the MCU (4.1) has embedded Algorithm 1 and Algorithm 2, which are the fuel pump (2.1) feeding algorithm and the hot oil circulation pump (3.1) flow rate algorithm, respectively.

2. The methanol catalytic combustion heating and hydrogen production thermal management system according to claim 1, characterized in that, The heat transfer oil pipe (1.5) is distributed in a serpentine pattern on all four sides inside the heat transfer shell (1.8), and the four sides are connected.

3. The methanol catalytic combustion heating and hydrogen production thermal management system according to claim 1, characterized in that, The temperature acquisition device (4.4), valve controller (4.3), and pump controller (4.2) are connected to the MCU (4.1) via RS485 or TPC communication.

4. The methanol catalytic combustion heating and hydrogen production thermal management system according to claim 3, characterized in that, The temperature acquisition device (4.4) simultaneously acquires three temperature information channels, the valve controller (4.3) controls multiple pneumatic valves, and the pump controller (4.2) controls multiple pumps.

5. The methanol catalytic combustion heating and hydrogen production thermal management system according to claim 1, 2, or 3, characterized in that, The fuel pump (2.1) feeding algorithm is a single-temperature-point PID algorithm of the second temperature measurement TE (1.2).

6. The methanol catalytic combustion heating and hydrogen production thermal management system according to claim 5, characterized in that, The user sets the desired temperature threshold, and the temperature return value is the test value of the second temperature measurement TE (1.2). The return value is compared with the threshold and returned to the MCU (4.1). The MCU (4.1) gives the values ​​of the proportional term Kp, integral term Ki, and derivative term Kd. The MCU (4.1) issues instructions to control the feed flow of the fuel pump (2.1). The air compressor (2.2) intake flow is set and automatically adjusted to follow the fixed ratio of fuel.

7. The methanol catalytic combustion heating hydrogen production thermal management system according to claim 1, 2, or 3, characterized in that, The flow rate algorithm of the hot oil circulating pump (3.1) is a multi-temperature point difference PID algorithm based on the first temperature measurement TE (1.1), the second temperature measurement TE (1.2), and the third temperature measurement TE (1.3).

8. The methanol catalytic combustion heating and hydrogen production thermal management system according to claim 7, characterized in that, The user sets the maximum temperature distribution difference allowed in the system as the threshold. The absolute values ​​of the temperature differences between the three temperature measurement points TE (1.1), TE (1.2), and TE (1.3) are compared to obtain the maximum value. The maximum value is compared with the set threshold and returned to the MCU (4.1). The MCU (4.1) provides the values ​​of the proportional term Kp, integral term Ki, and derivative term Kd. The MCU (4.1) issues instructions to control the flow rate of the hot oil circulation pump (3.1) to realize the heat transport to various parts of the burner (1) so that the burner (1) can release heat evenly.

9. The methanol catalytic combustion heating and hydrogen production thermal management system according to claim 1, characterized in that, The burner (1) is manufactured in a modular manner, and the manufacturing methods include casting, 3D printing, machine tool processing additive manufacturing or subtractive manufacturing.

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