阅读说明：本技术 一种液氢储氢型加氢站混合加注系统 (Mixed filling system of liquid hydrogen storage type hydrogen filling station ) 是由 倪中华 严岩 李永平 李仕豪 于 2021-07-16 设计创作，主要内容包括：本发明公开了一种液氢储氢型加氢站混合加注系统,包括与液氢储罐相连接的35MPa氢气加注单元和70MPa氢气加注单元,两个加注单元均包括与液氢储罐相连通的液氢泵,改变氢气流向与流量的流体分离器以及高压汽化器,35MPa氢气加注单元还包括：90MPa缓冲瓶组、45MPa缓冲瓶组和第一加氢机；70MPa氢气加注单元还包括：第二液氢输送管、高压氢气输送管、气液混合器和第二加氢机。本发明的优点在于：储氢容量大,能耗低,能满足不同形式氢气的加注需求。(The invention discloses a mixed filling system of a liquid hydrogen storage type hydrogen filling station, which comprises a 35MPa hydrogen filling unit and a 70MPa hydrogen filling unit which are connected with a liquid hydrogen storage tank, wherein the two filling units respectively comprise a liquid hydrogen pump communicated with the liquid hydrogen storage tank, a fluid separator for changing the flow direction and the flow rate of hydrogen, and a high-pressure vaporizer, and the 35MPa hydrogen filling unit also comprises: the device comprises a 90MPa buffer bottle group, a 45MPa buffer bottle group and a first hydrogenation machine; the 70MPa hydrogen filling unit also comprises: a second liquid hydrogen conveying pipe, a high-pressure hydrogen conveying pipe, a gas-liquid mixer and a second hydrogenation machine. The invention has the advantages that: the hydrogen storage capacity is large, the energy consumption is low, and the filling requirements of hydrogen in different forms can be met.)

1. The utility model provides a liquid hydrogen stores up hydrogen type hydrogen station and mixes filling system which characterized in that: the system comprises a 35MPa hydrogen filling unit and a 70MPa hydrogen filling unit which are connected with a station liquid hydrogen storage tank (1), wherein the 35MPa hydrogen filling unit comprises a first liquid hydrogen conveying pipe (15), a high-pressure vaporizer (4), a 90MPa buffer bottle group (5), a 45MPa buffer bottle group (7) and a first hydrogenation machine (8) which are sequentially connected, and the input end of the first liquid hydrogen conveying pipe (15) is communicated with the station liquid hydrogen storage tank (1) through a liquid hydrogen pump (2); the 70MPa hydrogen filling unit comprises a second liquid hydrogen conveying pipe (16), a high-pressure hydrogen conveying pipe (17), a gas-liquid mixer (12) and a second hydrogenation machine (13), wherein the input end of the second liquid hydrogen conveying pipe (16) is communicated with a station liquid hydrogen storage tank (1) through a liquid hydrogen pump (2), the input end of the high-pressure hydrogen conveying pipe (17) is communicated with the output end of a high-pressure vaporizer (4), the output ends of the second liquid hydrogen conveying pipe (16) and the high-pressure hydrogen conveying pipe (17) are communicated with the input end of the gas-liquid mixer (12), and the output end of the gas-liquid mixer (12) is connected with the second hydrogenation machine (13).

2. The hybrid refueling system of the liquid hydrogen storage type refueling station as claimed in claim 1, wherein: the first liquid hydrogen conveying pipe (15) and the second liquid hydrogen conveying pipe (16) are communicated with the liquid hydrogen pump (2) through a fluid separator (3), and the fluid separator (3) can control hydrogen flow in the first liquid hydrogen conveying pipe (15) and the second liquid hydrogen conveying pipe (16).

3. The hybrid refueling system of the liquid hydrogen storage type refueling station as claimed in claim 2, wherein: a pressure reducing valve (6) is arranged between the 90MPa buffer bottle group (5) and the 45MPa buffer bottle group (7).

4. The hybrid refueling system of the liquid hydrogen storage type refueling station as claimed in claim 3, wherein: and a first stop valve (10) and a second stop valve (11) are respectively arranged on the second liquid hydrogen conveying pipe (16) and the high-pressure hydrogen conveying pipe (17).

5. The hybrid refueling system of the liquid hydrogen storage type refueling station as claimed in claim 4, wherein: the 90MPa buffer bottle group (5) and the 45MPa buffer bottle group (7) are both formed by connecting a plurality of high-pressure hydrogen storage bottles in parallel and are divided into three pressure levels, namely high pressure, medium pressure and low pressure, and when the pressure of hydrogen in the 45MPa buffer bottle group (7) is not enough to be filled, the 90MPa buffer bottle group (5) is used for supplementing air to the 45MPa buffer bottle group (7) to 45 MPa.

6. The hybrid refueling system of the liquid hydrogen storage type refueling station as claimed in claim 5, wherein: the high-pressure vaporizer (4) consists of an environment heat exchanger and a heat exchanger, and the temperature of hydrogen at the outlet end of the high-pressure vaporizer (4) is 293K.

Technical Field

The invention relates to the technical field of liquid hydrogen hydrogenation stations, in particular to a mixed filling system of a liquid hydrogen storage type hydrogenation station.

Background

The hydrogen filling station is mainly divided into a high-pressure hydrogen storage hydrogen filling station and a liquid hydrogen storage hydrogen filling station, at present, the technology of the foreign liquid hydrogen storage hydrogen filling station is mature, and the liquid hydrogen filling station is used for filling 70MPa vehicle-mounted hydrogen storage bottles. The domestic hydrogen stations are mainly high-pressure hydrogen storage hydrogen stations, most of the hydrogen fuel cell automobiles can only be filled with 35MPa vehicle-mounted hydrogen storage bottles, the filling technology of the 70MPa vehicle-mounted hydrogen storage bottles is still in the research and development stage, and the application in the hydrogen stations is less. The defects of the prior hydrogenation station adopting high-pressure technology for hydrogen storage are as follows: 1. the hydrogen storage capacity is low, the daily hydrogen filling amount is 200 kg/day, the filling requirement of vehicles in small-scale demonstration operation can be basically met, and the increasing filling requirement along with the development of the hydrogen fuel cell automobile industry can not be met; 2. only 35MPa of high-pressure hydrogen can be filled, the filling form is single, and the mixed filling of 35MPa and 70MPa of hydrogen storage cylinders of passenger vehicles in the current market cannot be considered; 3. the hydrogen gas at the filling outlet needs to be cooled, and the energy consumption of the hydrogen filling station is large.

Disclosure of Invention

The invention aims to provide a mixed filling system of a liquid hydrogen storage type hydrogen filling station, which can simultaneously meet the filling requirements of hydrogen storage bottles of 35MPa and 70MPa hydrogen fuel cell vehicles, aiming at the defects of the prior art.

In order to solve the technical problems, the invention provides the following technical scheme:

the utility model provides a liquid hydrogen stores up hydrogen type hydrogen station and mixes filling system which characterized in that: the system comprises a 35MPa hydrogen filling unit and a 70MPa hydrogen filling unit which are connected with a liquid hydrogen storage tank for a station, wherein the 35MPa hydrogen filling unit comprises a first liquid hydrogen conveying pipe, a high-pressure vaporizer, a 90MPa buffer bottle group, a 45MPa buffer bottle group and a first hydrogenation machine which are sequentially connected, and the input end of the first liquid hydrogen conveying pipe is communicated with the liquid hydrogen storage tank for the station through a liquid hydrogen pump; the 70MPa hydrogen filling unit comprises a second liquid hydrogen conveying pipe, a high-pressure hydrogen conveying pipe, a gas-liquid mixer and a second hydrogenation machine, wherein the input end of the second liquid hydrogen conveying pipe is communicated with a station liquid hydrogen storage tank through a liquid hydrogen pump, the input end of the high-pressure hydrogen conveying pipe is communicated with the output end of the high-pressure hydrogen conveying pipe, the output ends of the second liquid hydrogen conveying pipe and the high-pressure vaporizer are communicated with the input end of the gas-liquid mixer, and the output end of the gas-liquid mixer is connected with the second hydrogenation machine.

Further, the first liquid hydrogen conveying pipe and the second liquid hydrogen conveying pipe are communicated with the liquid hydrogen pump through a fluid separator, and the fluid separator can control hydrogen flow in the first liquid hydrogen conveying pipe and the second liquid hydrogen conveying pipe.

Furthermore, a pressure reducing valve is arranged between the 90MPa buffer bottle group and the 45MPa buffer bottle group.

Furthermore, a first stop valve and a second stop valve are respectively arranged on the second liquid hydrogen conveying pipe and the high-pressure hydrogen conveying pipe.

Furthermore, the 90MPa buffer cylinder group and the 45MPa buffer cylinder group are formed by connecting a plurality of high-pressure hydrogen storage cylinders in parallel and are divided into a high pressure stage, a low pressure stage and a medium pressure stage, and when the hydrogen pressure in the 45MPa buffer cylinder group is not enough to be filled, the 90MPa buffer cylinder group supplies air to the 45MPa buffer cylinder group to reach 45 MPa.

Furthermore, the high-pressure vaporizer consists of an environment heat exchanger and a heat exchanger, and the temperature of hydrogen at the outlet end of the high-pressure vaporizer is 293K.

Compared with the prior art, the invention has the beneficial effects that: 1. liquid hydrogen is used as a hydrogen storage means of the hydrogen station, so that the filling capacity of the hydrogen station is greatly improved, and can reach 1000 kg/day compared with the common filling capacity of the high-pressure hydrogen storage hydrogen station of 200 kg/day; 2. the hydrogen gas at the filling outlet does not need to be pre-cooled, so that the energy consumption of the hydrogen filling station is reduced; 3. meanwhile, a 35MPa hydrogen filling unit and a 70MPa hydrogen filling unit are adopted, and the mixed filling of 35MPa and 70MPa passenger vehicle hydrogen storage cylinders in the current market is considered.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a flow chart of control logic according to the present invention.

Wherein: 1-liquid hydrogen storage tank for station; 2-liquid hydrogen pump; 3-a fluid separator; 4-a high pressure vaporizer; a buffer bottle group with 5-90 MPa; 6-a pressure reducing valve; a buffer bottle group of 7-45 MPa; 8-a first hydrotreater; 9-35MPa vehicle-mounted hydrogen storage cylinder; 10-a first stop valve; 11-a second stop valve; 12-gas-liquid mixer; 13-a second hydrotreater; 14-70MPa vehicle-mounted hydrogen storage cylinder; 15-a first liquid hydrogen delivery pipe; 16-a second liquid hydrogen conveying pipe; 17-high pressure hydrogen gas delivery pipe.

Detailed Description

For the understanding of the present invention, the following detailed description will be given with reference to the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.

Fig. 1 shows a mixed filling system of a liquid hydrogen storage type hydrogen filling station, which includes a 35MPa hydrogen filling unit and a 70MPa hydrogen filling unit connected to a station liquid hydrogen storage tank 1, wherein the 35MPa hydrogen filling unit includes a first liquid hydrogen delivery pipe 15, a high-pressure vaporizer 4, a 90MPa buffer bottle group 5, a 45MPa buffer bottle group 7 and a first hydrogen adding machine 8 which are connected in sequence, and an input end of the first liquid hydrogen delivery pipe 15 is communicated with the station liquid hydrogen storage tank 1 through a liquid hydrogen pump 2; the 70MPa hydrogen filling unit comprises a second liquid hydrogen conveying pipe 16, a high-pressure hydrogen conveying pipe 17, a gas-liquid mixer 12 and a second hydrogenation machine 13, wherein the input end of the second liquid hydrogen conveying pipe 16 is communicated with the station liquid hydrogen storage tank 1 through a liquid hydrogen pump 2, the input end of the high-pressure hydrogen conveying pipe 17 is communicated with the output end of the high-pressure vaporizer 4, the output ends of the second liquid hydrogen conveying pipe 16 and the high-pressure hydrogen conveying pipe 17 are communicated with the input end of the gas-liquid mixer 14, the output end of the gas-liquid mixer 14 is connected with the second hydrogenation machine 13, the first hydrogenation machine 8 fills a 35MPa vehicle-mounted hydrogen storage cylinder 9, and the second hydrogenation machine 13 fills the 70MPa vehicle-mounted hydrogen storage cylinder 14.

As a specific embodiment of the present invention, it is preferable that the first liquid hydrogen conveying pipe 15 and the second liquid hydrogen conveying pipe 16 are both communicated with the liquid hydrogen pump 2 through the fluid separator 3, and the fluid separator 3 can control hydrogen flow rates in the first liquid hydrogen conveying pipe 15 and the second liquid hydrogen conveying pipe 16; a pressure reducing valve 6 is arranged between the 90MPa buffer bottle group 5 and the 45MPa buffer bottle group 7; a first stop valve 10 and a second stop valve 11 are respectively arranged on the second liquid hydrogen conveying pipe 16 and the high-pressure hydrogen conveying pipe 17; the 90MPa buffer bottle group 5 and the 45MPa buffer bottle group 7 are formed by connecting a plurality of high-pressure hydrogen storage bottles in parallel and are divided into three pressure levels, namely high pressure, medium pressure, low pressure and medium pressure, and when the pressure of hydrogen in the 45MPa buffer bottle group 7 is not enough to be filled, the 90MPa buffer bottle group 5 is used for supplementing the 45MPa buffer bottle group 7 to 45 MPa; the high-pressure vaporizer 4 consists of an environment heat exchanger and a heat exchanger, and the temperature of hydrogen at the outlet end of the high-pressure vaporizer 4 is 293K.

Referring to fig. 2, the specific working process and principle of the present embodiment are described as follows:

the liquid hydrogen temperature in the station liquid hydrogen storage tank 1 is usually 20K, the liquid hydrogen is pumped out by the liquid hydrogen pump 2, and the liquid hydrogen is separated by the fluid separator 3 and is respectively conveyed to the first liquid hydrogen conveying pipe 15 and the second liquid hydrogen conveying pipe 16. The temperature of the hydrogen in the first liquid hydrogen conveying pipe 15 is about 50K, and the pressure is 90 MPa; the hydrogen in the second liquid hydrogen conveying pipe 16 is heated to 293K and 90MPa through the high-pressure vaporizer 4, the heated hydrogen can be stored in the 90MPa buffer cylinder group 5 and also can be conveyed to the gas-liquid mixer 12, the hydrogen conveyed to the gas-liquid mixer 12 is mixed with the low-temperature high-pressure hydrogen conveyed from the first liquid hydrogen conveying pipe 15 to obtain 233K and 85MPa hydrogen, and therefore the 70MPa vehicle-mounted hydrogen storage gas cylinder 14 is filled through the second hydrogenation machine 13.

The 35MPa hydrogen filling unit fills the 35MPa vehicle-mounted hydrogen storage cylinder 9 through the 45MPa buffer cylinder group 7 through the second hydrogenation machine 8. Stopping filling when the filling pressure difference is less than 2MPa, supplementing air to a 45MPa buffer bottle group 7 after the 90MPa buffer bottle group 5 passes through a pressure reducing valve 6, adjusting the fluid separator 3 when the pressure in the 90MPa buffer bottle group 5 is not enough to fill, and filling the 90MPa buffer bottle group 5 through the liquid hydrogen pump 2.

In the working principle of the above-mentioned mixed filling system of the liquid hydrogen storage type hydrogen filling station, the opening and closing of the valve need to be controlled, and the control logic is as shown in fig. 2. The key of the control logic is whether the pressure in the 90MPa buffer cylinder group 5 is enough to supplement air for the 45MPa buffer cylinder group 7, if not, the first stop valve 10 and the second stop valve 11 need to be closed, the 90MPa buffer cylinder group 5 is filled, and in the filling process, the 70MPa vehicle-mounted hydrogen storage cylinder 14 cannot be filled.

As a specific example, 2 62L 70MPa vehicle-mounted hydrogen storage cylinders 14 were filled, the filling time was 3min, the filling mass was 4.844kg, the total flow rate was 1.615kg/min, the hydrogen temperature in the first liquid hydrogen delivery pipe 15 was 50K, the hydrogen temperature in the high-pressure hydrogen delivery pipe 17 was 293K, and the temperature after mixing the two in the gas-liquid mixer 12 was 233K, the flow rate of the first liquid hydrogen delivery pipe 15 was 0.455kg/min, and the flow rate of the high-pressure hydrogen delivery pipe 17 was 1.153 kg/min.

The above embodiments are merely illustrative of the technical concept and structural features of the present invention, and are intended to be implemented by those skilled in the art, but the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should fall within the scope of the present invention.