阅读说明：本技术 用于甲醇水制氢机内钯管提纯器的控温系统及其控温方法 (Temperature control system and method for palladium tube purifier in methanol-water hydrogen production machine ) 是由 高继明 邓伟林 蒋彪 王小鹏 沈志杰 于 2020-08-07 设计创作，主要内容包括：本发明涉及一种用于甲醇水制氢机内钯管提纯器的控温系统,包括依次连接的甲醇水燃料箱、泵、蒸发器、燃烧室、缓冲室、钯管提纯器控温箱,以及用于监测钯管提纯器控温箱各处温度以防止产生过热点和过冷点的温度监测组件；所述的燃烧室连接有风机。本发明的用于甲醇水制氢机内钯管提纯器的控温系统,使钯管提纯器在使用的过程中受热均匀,不会产生过热点和过冷点,延长钯管提纯器的使用寿命。(The invention relates to a temperature control system for a palladium tube purifier in a methanol-water hydrogen production machine, which comprises a methanol-water fuel tank, a pump, an evaporator, a combustion chamber, a buffer chamber, a palladium tube purifier temperature control box and a temperature monitoring component, wherein the temperature monitoring component is used for monitoring the temperature of each part of the palladium tube purifier temperature control box so as to prevent the generation of a hot spot and a cold spot; the combustion chamber is connected with a fan. The temperature control system for the palladium tube purifier in the methanol-water hydrogen production machine enables the palladium tube purifier to be heated uniformly in the using process, avoids hot spots and cold spots, and prolongs the service life of the palladium tube purifier.)

1. A temperature control system for a palladium tube purifier in a methanol-water hydrogen production machine is characterized by comprising a methanol-water fuel tank (1), a pump (2), an evaporator (3), a combustion chamber (4), a buffer chamber (6), a palladium tube purifier temperature control box (7) and a temperature monitoring component for monitoring the temperature of each part of the palladium tube purifier temperature control box (7) so as to prevent the generation of a hot spot and a cold spot, wherein the methanol-water fuel tank, the pump (2), the evaporator (3), the combustion chamber (4), the buffer chamber (6) and the palladium tube purifier temperature control; the combustion chamber (4) is connected with a fan (5).

2. The temperature control system for the palladium tube purifier in the methanol-water hydrogen production machine according to claim 1, wherein the temperature control box (7) of the palladium tube purifier comprises a flue gas inlet (701), a flue gas outlet (703), a palladium tube purifier (704), a mixed gas inlet (705), a pure hydrogen outlet (706) and a waste gas outlet (707).

3. The temperature control system for the palladium tube purifier in the methanol-water hydrogen production machine according to claim 2, wherein the temperature monitoring assembly comprises a first thermocouple, a second thermocouple (8), a third thermocouple (9) and a fourth thermocouple (10), the first thermocouple is arranged in the buffer chamber (6), the second thermocouple (8) is arranged at a flue gas outlet (703) of the palladium tube purifier temperature control box (7), the third thermocouple (9) is arranged at a mixed gas inlet (705) of the palladium tube purifier temperature control box (7), and the fourth thermocouple (10) is arranged on the palladium tube purifier (704).

4. The temperature control system for the palladium tube purifier in the methanol-water hydrogen production machine according to claim 3, wherein a flue gas distributor (702) is arranged above the flue gas inlet (701).

5. The temperature control system for the palladium tube purifier in the methanol-water hydrogen production machine according to claim 3, wherein the mixed gas inlet (705), the pure hydrogen outlet (706) and the exhaust gas outlet (707) are respectively communicated with a mixed gas bus bar (708), a pure hydrogen bus bar (709) and an exhaust gas bus bar (710) which are arranged inside the temperature control box (7) of the palladium tube purifier.

6. The temperature control system for the palladium tube purifier in the methanol-water hydrogen generator according to any one of claims 1 to 5, wherein the surface of the temperature control box (7) of the palladium tube purifier is provided with an insulating layer (711).

7. The temperature control system for the palladium tube purifier in the methanol-water hydrogen production machine according to any one of claims 1 to 5, wherein an electric heater is arranged in the evaporator (3).

8. The temperature control system for the palladium tube purifier in the methanol-water hydrogen production machine is characterized in that an igniter is arranged in the combustion chamber (4).

9. A temperature control method of a temperature control system based on a palladium tube purifier in a methanol-water hydrogen production machine is characterized by comprising the following steps:

step one, in the initial stage of operation of the methanol-water reforming hydrogen production device, a pump (2) inputs methanol water in a methanol-water fuel tank (1) into an evaporator (3), and the methanol water is evaporated into gaseous methanol water vapor under the heating of the evaporator (3);

secondly, methanol steam enters a combustion chamber (4), and a fan (5) blows air to enter the combustion chamber (4) to be mixed with the methanol steam for ignition and combustion;

step three, flue gas generated by the combustion chamber (4) enters a buffer chamber (6), is uniformly mixed in the buffer chamber (6) and has uniform temperature, and enters a temperature control box (7) of a palladium tube purifier;

step four, the flue gas passes through a flue gas distributor (702) at the bottom of the temperature control box (7) of the palladium tube purifier to uniformly heat the palladium tube purifier (704); when the temperature of the palladium tube purifier (704) reaches a proper working temperature range, mixed gas can be introduced for separating hydrogen; and the rotating speed of the fan (5) and the speed of the pump (2) are adjusted according to the information feedback of the first thermocouple, the second thermocouple (8), the third thermocouple (9) and the fourth thermocouple (10), so that the palladium tube purifier (704) is always at a proper working temperature.

10. The temperature control method of the temperature control system based on the palladium tube purifier in the methanol-water hydrogen production machine according to claim 9, wherein the detailed steps of adjusting the rotating speed of the fan (5) and the speed of the pump (2) by information feedback of the thermocouple in the fourth step are as follows: when the third thermocouple (9) detects that the temperature of the mixed gas is too low, the rotating speed of the pump (2) is increased, the rotating speed of the fan (5) is reduced, and the temperature of the flue gas is increased to heat the palladium tube purifier (704) so as to achieve a proper separation working temperature; when the third thermocouple (9) detects that the temperature of the mixed gas is too high, the rotating speed of the pump (2) is reduced, the rotating speed of the fan (5) is increased, and the temperature of the flue gas is reduced so that the palladium tube purifier (704) is cooled to reach a proper separation working temperature; when the methanol-water reforming hydrogen production device does not work, the fan (5) and the pump (2) are kept to operate at low power, a small amount of high-temperature flue gas is generated to heat the palladium tube, the generated heat compensates for the heat diffusion loss of the temperature control device of the palladium tube purifier (704), and the fourth thermocouple (10) is kept at the working temperature of the palladium tube purifier (704).

Technical Field

The invention relates to the technical field of methanol-water hydrogen production machines, in particular to a temperature control system and a temperature control method for a palladium tube purifier in a methanol-water hydrogen production machine.

Background

Due to the advantages of environmental protection, good environmental adaptability, long service life and the like of the fuel cell, the fuel cell has started to be applied and popularized in the fields of communication base stations and the like.

At present, the hydrogen production in the world is mainly from fossil resources such as coal, natural gas and methanol to prepare hydrogen, and the prepared hydrogen contains CO₂CO and CH₄And the like, and thus the impurity gas cannot be directly supplied to the fuel cell and further needs to be separated and purified. The main hydrogen separation methods comprise pressure swing adsorption, cryogenic separation and membrane separation, wherein the membrane separation technology has the advantages of low energy consumption, easy miniaturization, sustainable operation, silence and the like, and is particularly suitable for providing hydrogen sources for fuel cells. Methanol reforming is taken as a hydrogen source of the fuel cell, and the palladium membrane separation and purification technology is combined, so that the fuel cell has good application prospects in the aspects of household standby power supplies, hydrogen fuel cell vehicles, large-scale energy storage and the like, and the fuel cell has been paid attention to by a plurality of domestic research units and enterprises. In the technical route, palladium membrane separation is a key technology, and is one of key elements for realizing the integration of preparation, purification, storage, transportation and application of hydrogen. The metal palladium membrane only allows hydrogen to permeate, other impurity gases are trapped on the surface of the membrane, and the theoretical selectivity is infinite, so the metal palladium membrane has very remarkable advantages in the hydrogen separation and purification process.

The palladium tube is widely applied to hydrogen separation as one form of a palladium membrane, but the working temperature of the palladium tube is about 400 ℃, the palladium tube needs to be heated to reach the separation working temperature, the conventional heating method is to electrically heat and directly fire the palladium tube, the two heating methods are easy to generate a hot spot and a cold spot, the cold spot can reduce the separation efficiency of the palladium tube, the expected separation effect can not be achieved, and the palladium tube is easy to damage due to the hot spot.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a temperature control system suitable for a palladium tube purifier in a methanol-water hydrogen production machine, so that the palladium tube purifier is uniformly heated in the using process, no hot spot or supercooling spot is generated, and the service life of the palladium tube purifier is prolonged.

The technical scheme adopted by the invention is as follows: a temperature control system for a palladium tube purifier in a methanol-water hydrogen production machine comprises a methanol-water fuel tank, a pump, an evaporator, a combustion chamber, a buffer chamber, a palladium tube purifier temperature control box and a temperature monitoring assembly, wherein the temperature monitoring assembly is used for monitoring the temperature of each part of the palladium tube purifier temperature control box so as to prevent overheating points and supercooling points; the combustion chamber is connected with a fan.

Preferably, the temperature control box of the palladium tube purifier comprises a flue gas inlet, a flue gas outlet, the palladium tube purifier, a mixed gas inlet, a pure hydrogen outlet and a waste gas outlet.

Preferably, the temperature monitoring assembly comprises a first thermocouple, a second thermocouple, a third thermocouple and a fourth thermocouple, the first thermocouple is arranged in the buffer chamber, the second thermocouple is arranged at a flue gas outlet of the temperature control box of the palladium tube purifier, the third thermocouple is arranged at a mixed gas inlet of the temperature control box of the palladium tube purifier, and the fourth thermocouple is arranged on the palladium tube purifier.

Preferably, a flue gas distributor is arranged above the flue gas inlet.

Preferably, the mixed gas inlet, the pure hydrogen outlet and the waste gas outlet are respectively communicated with a mixed gas bus bar, a pure hydrogen bus bar and a waste gas bus bar which are arranged inside the temperature control box of the palladium tube purifier.

Preferably, the surface of the temperature control box of the palladium tube purifier is provided with a heat insulation layer.

Preferably, an electric heater is arranged in the evaporator.

Preferably, an igniter is disposed within the combustion chamber.

A temperature control method of a temperature control system based on a palladium tube purifier in a methanol-water hydrogen production machine comprises the following steps:

step one, in the initial stage of operation of a methanol-water reforming hydrogen production device, a pump inputs methanol water in a methanol-water fuel tank into an evaporator, and the methanol water is evaporated into gaseous methanol water vapor under the heating of the evaporator;

secondly, methanol steam enters a combustion chamber, and a fan blows air into the combustion chamber to be mixed with the methanol steam for ignition and combustion;

step three, enabling flue gas generated by the combustion chamber to enter a buffer chamber, uniformly mixing the flue gas in the buffer chamber, and enabling the flue gas to enter a temperature control box of a palladium tube purifier;

step four, the flue gas passes through a flue gas distributor at the bottom of the temperature control box of the palladium tube purifier to uniformly heat the palladium tube purifier; when the temperature of the palladium tube purifier reaches a proper working temperature range, mixed gas can be introduced for separating hydrogen; and the rotating speed and the pump speed of the fan are adjusted according to the information feedback of the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple, so that the palladium tube purifier is always at a proper working temperature.

Preferably, the detailed steps of the information feedback adjustment of the fan rotating speed and the pump speed of the thermocouple in the fourth step are as follows: when the third thermocouple detects that the temperature of the mixed gas is too low, the rotating speed of the pump is increased, the rotating speed of the fan is reduced, and the temperature of the flue gas is increased to heat the palladium tube purifier so as to reach the proper separation working temperature; when the third thermocouple detects that the temperature of the mixed gas is too high, the rotating speed of the pump is reduced, the rotating speed of the fan is increased, and the temperature of the flue gas is reduced so that the palladium tube purifier is cooled to reach a proper separation working temperature; when the methanol-water reforming hydrogen production device does not work, the fan and the pump are kept to operate at low power, a small amount of high-temperature flue gas is generated to heat the palladium tube, the generated heat compensates for the heat diffusion loss of the temperature control device of the palladium tube purifier, and the fourth thermocouple is kept at the working temperature of the palladium tube purifier.

Compared with the prior art, the invention has the following advantages:

1. the invention uses flue gas for heating, the rear part of the combustion chamber is additionally provided with the buffer chamber for uniformly mixing the flue gas, so that the temperature of the flue gas is uniform, and the lower part of the temperature control box of the palladium tube purifier is provided with the flue gas distributor for uniformly distributing the flue gas to each palladium tube, so that each palladium tube is uniformly heated.

2. The invention monitors the temperature of each part of the temperature control device of the palladium tube purifier by arranging four thermocouples, and feeds back and adjusts the rotating speed of the fan and the pump speed according to the information of each thermocouple, so that the palladium tube purifier is always at the proper working temperature.

3. When the hydrogen production machine does not work, the temperature of the palladium tube purifier is maintained by burning a small amount of methanol water, so that the palladium tube purifier can enter a hot standby mode in a working state at any time, and a wider application space is provided for the methanol water hydrogen production machine.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

FIG. 2 is a schematic side sectional view of a palladium tube purifier temperature control box of the present invention.

FIG. 3 is a schematic top sectional view of a palladium tube purifier temperature control box of the present invention;

FIG. 4 is a schematic view of a flue gas distributor of the present invention;

the numbers in the figures indicate:

methanol-water fuel tank 1, pump 2, evaporator 3, combustion chamber 4, fan 5, buffer chamber 6, palladium tube purifier temperature control box 7, flue gas inlet 701, flue gas distributor 702, flue gas outlet 703, palladium tube purifier 704, mixed gas inlet 705, pure hydrogen outlet 706, exhaust gas outlet 707, mixed gas busbar 708, pure hydrogen busbar 709, exhaust gas busbar 710, second thermocouple 8, third thermocouple 9 and fourth thermocouple 10.

The specific implementation mode is as follows:

for the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and embodiment examples. The invention can be implemented by:

referring to fig. 1-4, a temperature control system for a palladium tube purifier in a methanol-water hydrogen production machine comprises a methanol-water fuel tank 1, a pump 2, an evaporator 3, a combustion chamber 4, a fan 5, a buffer chamber 6, a palladium tube purifier temperature control box 7, a first thermocouple, a second thermocouple 8, a third thermocouple 9 and a fourth thermocouple 10. An electric heater is arranged in the evaporator 3, and the electric heater can heat and evaporate methanol water into gaseous methanol water vapor; an igniter is arranged in the combustion chamber 4 and used for igniting the methanol water vapor.

The temperature control box 7 of the palladium tube purifier comprises a flue gas inlet 701, a flue gas distributor 702, a flue gas outlet 703, a palladium tube purifier 704, a mixed gas inlet 705, a pure hydrogen outlet 706, a waste gas outlet 707, a mixed gas bus bar 708, a pure hydrogen bus bar 709 and a waste gas bus bar 710; the mixed gas inlet 705, the pure hydrogen outlet 706 and the waste gas outlet 707 are respectively communicated with a mixed gas bus bar 708, a pure hydrogen bus bar 709 and a waste gas bus bar 710 which are arranged inside the temperature control box 7 of the palladium tube purifier. And a heat-insulating layer 711 is arranged on the surface of the temperature control box 7 of the palladium tube purifier.

First thermocouple, second thermocouple 8, third thermocouple 9, and fourth thermocouple 10 form temperature monitoring components for monitoring the temperature throughout palladium tube purifier temperature control tank 7 to prevent the occurrence of hot and cold spots. Wherein the first thermocouple is arranged in the buffer chamber 6; the second thermocouple 8 is arranged at the flue gas outlet 703 of the palladium tube purifier temperature control box 7; the third thermocouple 9 is arranged at a mixed gas inlet 705 of the palladium tube purifier temperature control box 7; the fourth thermocouple 10 is disposed on palladium tube purifier 704.

The methanol water fuel tank 1 is sequentially connected with a pump 2, an evaporator 3, a combustion chamber 4, a buffer chamber 6 and a palladium tube purifier temperature control box 7, and a fan 5 is connected with the combustion chamber 4. The palladium tube purifier 704 needs to be operated at about 400 c, and when the temperature is too low, the separation efficiency is reduced, the hydrogen gas obtained by separation is reduced, and when the temperature is too high, the palladium tube is damaged.

A temperature control method based on the temperature control system of the palladium tube purifier in the methanol-water hydrogen production machine comprises the following steps: referring to fig. 1, in the initial stage of operation of the methanol-water hydrogen production machine, a palladium tube purifier 704 is in a normal temperature state, methanol water is input into an evaporator 3 by a pump 2, methanol water vapor evaporated into a gaseous state under the heating of an electric heater enters a combustion chamber 4, a fan 5 blows air to enter the combustion chamber 4 to be mixed with the methanol water vapor for ignition and combustion, generated flue gas enters a buffer chamber 6, the flue gas is mixed uniformly in the buffer chamber 6, the temperature of the flue gas is uniform, and the flue gas enters a temperature control box 7 of the palladium tube purifier; the flue gas passes through a flue gas distributor 702 at the bottom of the temperature control box 7 of the palladium tube purifier to uniformly heat the palladium tube purifier 704. When the temperature of the palladium tube purifier 704 reaches a proper working temperature interval, mixed gas can be introduced to separate hydrogen, when the third thermocouple 9 detects that the temperature of the mixed gas is too low, the rotating speed of the pump 2 is increased, the rotating speed of the fan 5 is reduced, the temperature of flue gas is increased to heat the palladium tube purifier 704 to reach a proper separation working temperature, and at the moment, the temperature of the first thermocouple is required to be higher than the temperatures of the second thermocouple 9 and the third thermocouple 9. When the third thermocouple 9 detects that the temperature of the mixed gas is too high, the rotating speed of the pump 2 is reduced, the rotating speed of the fan 5 is increased, the temperature of the flue gas is reduced, and the palladium tube purifier 704 is cooled to reach a proper separation working temperature, wherein the temperature of the first thermocouple is required to be lower than the temperatures of the second thermocouple 9 and the third thermocouple 9. When the methanol-water reforming hydrogen production device does not work, the fan 5 and the pump 2 are kept to operate at low power, a small amount of high-temperature flue gas is generated to heat the palladium tube, the generated heat compensates for the heat diffusion loss of the temperature control device of the palladium tube purifier 704, and the fourth thermocouple 10 is kept at the working temperature of the palladium tube purifier 704.

Finally, it should be noted that: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.