CN216113353U - Supply system of hydrogen production and hydrogenation integrated hydrogenation station - Google Patents
Supply system of hydrogen production and hydrogenation integrated hydrogenation station Download PDFInfo
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- CN216113353U CN216113353U CN202122470792.7U CN202122470792U CN216113353U CN 216113353 U CN216113353 U CN 216113353U CN 202122470792 U CN202122470792 U CN 202122470792U CN 216113353 U CN216113353 U CN 216113353U
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Abstract
The utility model provides a supply system of a hydrogen production and hydrogenation integrated hydrogenation station, which comprises a hydrogen production system, a compression system, a storage system, a filling system, an external source input system, a reverse filling system and a control system; the supply system is provided with two operation modes of 'hydrogenation valley time period' and 'hydrogenation peak time period' according to the operation condition of the current hydrogenation station, the reverse filling system is utilized to realize 'time-span' hydrogen storage, and in the 'hydrogenation valley time period' working mode, the reverse filling system is started so as to improve the inlet pressure of the compression system and the hydrogen filling rate in the 'hydrogenation peak time period' working mode; the supply system can reduce the hydrogen production scale of the hydrogenation station by 20 percent, reduce the scale of the compressor by 45 percent, save the equipment investment cost by more than 25 percent and improve the hydrogen utilization rate of the hydrogenation station by more than 10 percent.
Description
Technical Field
The utility model belongs to the technical field of hydrogen energy utilization, and particularly relates to a supply system of a hydrogen production and hydrogenation integrated hydrogenation station.
Background
In the future world energy development stage, hydrogen energy plays a significant role, has the obvious advantages of zero carbon and high efficiency as an energy carrier and an energy interconnection medium, and can promote the transformation and upgrading of global energy if the hydrogen energy is widely applied.
At present, a hydrogen station has two modes of hydrogen production in the station and hydrogen production outside the station. The hydrogen production in the station generally adopts the processes of water electrolysis hydrogen production and natural gas hydrogen production. The hydrogen production in the station has the advantages of saving the transportation cost of hydrogen and reducing the volume of a hydrogen storage tank of a hydrogen station, but the hydrogen production equipment needs to be started and stopped frequently, particularly a compressor, and the operation management is complex and difficult as the hydrogen filling of the current hydrogen fuel cell vehicle is random and discontinuous. The compressor is an important device in a hydrogen filling station, the cost of the compressor accounts for 30% of the construction cost of the whole compressor, and the service life of a diaphragm of a common diaphragm compressor is related to the starting frequency, so that the discontinuous operation of the compressor is caused by the instability of a downstream filling market, and the maintenance cost is greatly improved.
Even the mode that the hydrogen is transported hydrogen to the hydrogenation station through long tube trailer to the hydrogen of standing outer hydrogen manufacturing still needs the compressor, and long tube trailer hydrogen utilization ratio is not high at present simultaneously, and general hydrogenation station can only use 5MPa and just stops using, causes very big a part hydrogen can only be pulled back by the trailer. Therefore, it is very important to provide a hydrogen supply system with high efficiency, energy saving and cost reduction.
CN111828833A discloses a hydrogen production and hydrogenation station system, which comprises hydrogen production equipment, buffer storage equipment and pressure adjusting equipment, the hydrogen production equipment, the cache equipment and the pressure adjusting equipment are connected through pipelines, the hydrogen production equipment is used for producing hydrogen, the buffer device is used for storing hydrogen in the hydrogen production hydrogenation station system, the pressure adjusting device is used for adjusting the pressure of hydrogen gas flow passing through the buffer device, the pressure adjustment device may be provided in plurality, the buffer device includes a first storage tank and a second storage tank, the first storage tank is connected with hydrogen production equipment through a pipeline, the second storage tank is connected with the first storage tank through a pipeline, and a pressure adjusting device is arranged on a pipeline connecting the second storage tank and the first storage tank, a hydrogenation pipeline is further connected onto the second storage tank, and the hydrogenation pipeline can outwards output hydrogen with various different pressures. Although the system improves the hydrogenation efficiency to a certain extent, the problem of frequent start and stop of the compressor caused by the concentrated hydrogenation time period and the idle hydrogenation time period can not be effectively solved, and the problem of high investment cost still exists.
In view of the above problems, how to provide a hydrogen supply system with high efficiency, energy saving and cost reduction is a problem to be solved in the present day, aiming at the characteristics of the centralized time period and the idle time period of the hydrogenation in the hydrogenation station.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model aims to provide a supply system of a hydrogen production and hydrogenation integrated hydrogenation station, which optimizes the system structure and is provided with a reverse filling system according to the operation condition of the existing hydrogenation station, namely, the concentrated filling time period and the long idle time period exist, so that the utilization rate of hydrogen is improved, the investment cost is saved, and the industrial application is facilitated.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a supply system of a hydrogen production and hydrogenation integrated hydrogenation station, which comprises a hydrogen production system, a compression system, a storage system, a filling system, an external source input system, a reverse filling system and a control system;
the compression system comprises a first-stage compression unit and a second-stage compression unit;
the hydrogen production system, the primary compression unit, the secondary compression unit and the filling system are connected in sequence;
the storage system comprises a primary storage unit and a secondary storage unit;
the primary storage unit is connected with an outlet pipeline of the primary compression unit; the secondary storage unit is connected with an outlet pipeline of the secondary compression unit;
the external source input system is also connected with an outlet pipeline of the primary compression unit;
the secondary compression unit is also connected with the primary storage unit through the reverse filling system;
the control system is used for controlling the hydrogen production system, the compression system, the storage system, the filling system and the reverse filling system.
In the utility model, the supply system is designed based on the running condition of the existing hydrogenation station, the non-stop of the compressor can be realized in the hydrogenation trough period, the problem of frequent start and stop of the compressor caused by the hydrogenation centralized period and the idle period is solved, and meanwhile, the system can reduce the working load of the compressor by more than 35 percent and save the equipment investment cost by more than 20 percent.
The 'reverse filling system' connects the outlet of the second-stage compression unit with the inlet of the first-stage storage unit, so that the hydrogen compressed by the second-stage compression unit can be reversely filled into the first-stage storage unit in the hydrogenation valley period, and the inlet pressure of the second-stage compression unit is increased temporarily in the peak period, thereby increasing the hydrogenation speed, simultaneously realizing the non-stop operation of the compressor, prolonging the service life of the compressor, and avoiding the damage caused by frequent start and stop.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferred technical scheme, the hydrogen production system comprises a hydrogen production device.
In the utility model, the hydrogen production device can comprise any hydrogen production mode such as natural gas hydrogen production, methanol hydrogen production, water electrolysis hydrogen production and the like, but the purity of the hydrogen meets the standard and specification requirements of fuel hydrogen.
As a preferred technical solution of the present invention, the first-stage compression unit includes a first-stage compressor.
The secondary compression unit includes a secondary compressor.
In the utility model, the outlet pressure of the primary compressor can reach 20-25 MPa; the outlet pressure of the secondary compressor can reach 35-45 MPa.
As a preferred technical scheme of the utility model, the external source input system comprises a hydrogen long-tube trailer.
In the present invention, the external input system can supplement the hydrogen supply shortage in the station.
As a preferred technical scheme of the utility model, the filling system comprises a hydrogenation machine.
In a preferred embodiment of the present invention, the primary storage unit includes at least 2 pressure intervals, such as 2, 3, 4, or 5, but not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable, and the tanks in each pressure interval are connected in parallel.
The primary storage unit comprises a primary low-pressure area storage tank and a primary high-pressure area storage tank.
The number of primary low pressure zone tanks is at least 1, such as 1, 2, 3, 4, or 5, but not limited to the recited values, and other values not recited within this range are equally applicable.
The number of first-stage high-pressure-zone tanks is at least 1, such as 1, 2, 3, 4 or 5, etc., but is not limited to the recited values, and other values not recited in this range are equally applicable.
In a preferred embodiment of the present invention, the set pressure of the primary low-pressure-region tank is 5 to 20MPa, for example, 5MPa, 10MPa, 15MPa, or 20MPa, but the set pressure is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
The set pressure of the first-stage high-pressure-region storage tank is 25 to 45MPa, for example, 25MPa, 30MPa, 35MPa, 40MPa or 45MPa, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
In the utility model, the low-pressure area storage tank of the primary storage unit is used for storing the hydrogen after primary compression, thereby playing a buffer role in storing the hydrogen; the high-pressure area storage tank is used as an object of reverse filling and is used for coping with the hydrogenation peak period, the pressure at the inlet of the secondary compressor is further increased, and the treatment capacity of the secondary compressor is further increased.
In a preferred embodiment of the present invention, the secondary storage unit includes at least 2 pressure intervals, such as 2, 3, 4, or 5, but not limited to the recited values, other values not recited in the range of the recited values are also applicable, and the tanks in each pressure interval are connected in parallel.
The secondary storage unit comprises a secondary low-pressure area storage tank, a secondary medium-pressure area storage tank and a secondary high-pressure area storage tank.
The number of secondary low pressure zone tanks is at least 1, such as 1, 2, 3, 4, or 5, but not limited to the recited values, and other values not recited within this range are equally applicable.
The secondary medium pressure zone tanks are at least 1, such as 1, 2, 3, 4, or 5, but are not limited to the recited values, and other values not recited within the recited range are equally applicable.
The second-stage high-pressure-zone storage tanks are at least 1, such as 1, 2, 3, 4 or 5, but not limited to the recited values, and other values not recited in this range are equally applicable.
The maximum withstand pressure of the secondary low-pressure region storage tank, the secondary medium-pressure region storage tank and the secondary high-pressure region storage tank is less than or equal to 45MPa, such as 25MPa, 30MPa, 35MPa, 40MPa or 45MPa, but the maximum withstand pressure is not limited to the recited values, and other values not recited in the range of the values are also applicable.
In the utility model, the secondary storage unit plays an important role in two periods. In the hydrogenation trough period, when the required filling amount is small, the hydrogenation requirement can be met through the secondary storage unit; in the hydrogenation peak period, the storage tanks in various pressure intervals are used for selecting proper hydrogenation pressure and hydrogenation rate according to the condition of equipment to be hydrogenated, so that the utilization rate of hydrogen in the station is improved, and the danger caused by overlarge hydrogenation rate due to direct flushing of a compressor is avoided.
For example, the pressure of the secondary low-pressure area storage tank is 16MPa, the pressure of the secondary medium-pressure area storage tank is 25MPa, the pressure of the secondary high-pressure area storage tank is 35MPa, when the design pressure which can be borne by equipment to be filled is 47.5MPa, and the pressure before filling is 17MPa, the secondary medium-pressure area storage tank is automatically selected to be adopted by the sequence control system to fill the equipment, if the filling rate is lower than 4kg/min, the secondary medium-pressure area storage tank is closed, the secondary high-pressure area storage tank is opened, and if the filling rate is lower than 4kg/min again, the secondary compressor is adopted to directly fill the equipment; the phenomenon that the hydrogen pressure difference is too large and the filling rate is too high is avoided.
As a preferable technical scheme of the utility model, the reverse filling system comprises a first branch pipeline, and the secondary compressor is connected with the primary high-pressure area storage tank through the first branch pipeline.
In the utility model, the first branch pipeline is also provided with a pressure reducing valve.
As a preferred technical solution of the present invention, the control system further includes a sequence control board, and the secondary compressor is connected to the secondary storage unit through the sequence control board.
In the utility model, the sequence control panel can control the hydrogenation rate of various storage tanks and compressors of the secondary storage unit in the hydrogenation process by controlling the rotating speed of the secondary compressor, the switch of the filling system and the switch of the reverse filling system.
The utility model also provides a supply method adopting the supply system, which comprises the following modes:
the hydrogenation peak period comprises:
(1) opening the secondary storage unit, and starting a filling system to fill hydrogen into the required equipment; (2) when the hydrogenation rate is lower than a first hydrogenation preset value, closing the reverse filling system, and opening the first-stage compression unit and the second-stage compression unit to increase the hydrogenation rate; (3) when the inlet pressure of the secondary compression unit is smaller than a first pressure preset value, the primary storage unit is opened, and the inlet pressure of the secondary compression unit is increased; (4) when the inlet pressure of the secondary compression unit is smaller than a second pressure preset value, an external source input system is opened, and the inlet pressure of the secondary compression unit is increased;
the hydrogenation trough period comprises:
firstly, after the hydrogenation peak period is finished, closing a filling system and a secondary storage unit; closing a connecting channel between the first-stage compression unit and the second-stage compression unit and a connecting channel between the first-stage storage unit and the second-stage compression unit, starting a reverse filling system, and performing one-time reverse filling operation on residual hydrogen input into the system from an external source; when the pressure of the external source input system is smaller than a third pressure preset value, closing the external source input system, then opening a connecting channel between the first-stage compression unit and the second-stage compression unit, and performing secondary reverse filling operation on the hydrogen compressed by the first-stage compression unit; and fourthly, stopping the reverse filling operation when the pressure of the primary storage unit reaches a fourth preset pressure value.
In the utility model, the 'hydrogenation peak period' refers to a time period with large output of hydrogen filling and relatively concentrated time, which is mostly day, when a hydrogenation station operates in one day; the 'hydrogenation valley period' refers to a time period with low overall filling amount or no relative concentration in the operation of a hydrogenation station in one day, and is mostly night. The 'hydrogenation peak period' and the 'hydrogenation valley period' are alternately carried out, have no sequence and are switched at any time according to actual conditions.
According to the supply method, two supply modes, namely a 'hydrogenation valley period' working mode and a 'hydrogenation peak period' working mode, are controlled according to the actual situation of the hydrogenation station, and the reverse filling system is started in the hydrogenation valley period, so that the utilization of energy is realized to the maximum extent, the compressor is not stopped (namely, the primary compressor and the secondary compressor are continuously operated), and the hydrogen production scale of the hydrogenation station is reduced; meanwhile, the hydrogen filling rate is improved, and the hydrogen utilization rate of the hydrogen filling station is improved. Has higher economic benefit.
In the utility model, when entering the hydrogenation valley period, all storage tanks of the secondary storage unit are required to be filled before the secondary storage unit is closed in the step I. As a preferred technical scheme of the utility model, the specific steps of the step (1) comprise: firstly, starting a secondary low-pressure area storage tank for filling; when the hydrogenation rate is lower than the first hydrogenation preset value, closing the secondary low-pressure area storage tank, opening the secondary medium-pressure area storage tank, and filling; and when the hydrogenation rate is lower than the first hydrogenation preset value again, closing the storage tank of the second-stage medium-pressure area, and opening the storage tank of the second-stage high-pressure area for filling.
Preferably, the first hydrogenation preset value is 3 to 5kg/min, such as 3kg/min, 3.5kg/min, 4kg/min, 4.5kg/min, or 5kg/min, but not limited to the recited values, and other values not recited in the range of values are also applicable.
In a preferred embodiment of the present invention, the first predetermined pressure value in step (3) is 15 to 35MPa, such as 15MPa, 20MPa, 25MPa, 30MPa or 35MPa, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the specific operation of opening the primary storage unit in step (3) includes: firstly, opening a storage tank in a first-stage low-pressure area, and increasing the inlet pressure of a second-stage compression unit; when the inlet pressure of the second-stage compression unit is smaller than the first pressure preset value again, closing the first-stage low-pressure area storage tank, opening the first-stage high-pressure area storage tank, and increasing the inlet pressure of the second-stage compression unit;
or directly opening the storage tank in the first-stage high-pressure area to increase the inlet pressure of the second-stage compression unit.
Preferably, the second pressure of step (4) is preset at a value of 6-10MPa, such as 6MPa, 7MPa, 8MPa, 9MPa or 10MPa, but not limited to the values listed, and other values not listed in the range are also applicable.
As a preferable technical scheme of the utility model, the first reverse filling operation and the second reverse filling operation are both reverse filling on the first-level high-pressure-area storage tank.
Preferably, the residual pressure of the external input system before the first reverse filling operation in step (ii) is 5-10MPa, such as 5MPa, 6MPa, 7MPa, 8MPa, 9MPa or 10MPa, but not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the step of closing the connection channel between the primary storage unit and the secondary compression unit further includes: and opening a channel between the first-stage compressor and the first-stage low-pressure area storage tank, and closing the channel between the first-stage compressor and the first-stage high-pressure area storage tank.
In the utility model, the operation of the second step can ensure that the hydrogen production device and the primary compressor are not stopped while the external source input system carries out primary reverse filling, the generated hydrogen enters the primary low-pressure area storage tank for storage, and the filling is stopped when the primary low-pressure area storage tank reaches the set pressure.
Preferably, step c said third predetermined pressure value is 1-5MPa, such as 1MPa, 2MPa, 3MPa, 4MPa or 5MPa, but not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the secondary back-filling operation further comprises the step of carrying out secondary back-filling on the primary high-pressure area storage tank by hydrogen in the primary low-pressure area storage tank.
In the utility model, when secondary reverse filling is carried out, if the hydrogen compressed by the primary compressor is higher than the pressure of the primary low-pressure area storage tank, the hydrogen compressed by the primary compressor is reversely filled into the primary high-pressure area storage tank, and the primary low-pressure area storage tank is filled while the primary high-pressure area storage tank is reversely filled; when the pressure of the hydrogen compressed by the first-stage compressor is equal to that of the first-stage low-pressure area storage tank, the hydrogen compressed by the first-stage compressor and the hydrogen in the first-stage low-pressure area storage tank are subjected to secondary reverse filling together with the high-pressure area storage tank after secondary compression.
Preferably, filling is stopped when the pressure at which the primary low pressure region storage tank is filled reaches its set pressure.
In a preferred embodiment of the present invention, the fourth preset pressure value in step (iv) is 25 to 45MPa, such as 25MPa, 30MPa, 35MPa, 40MPa or 45MPa, but is not limited to the values listed above, and other values not listed above within the range of values are also applicable.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the supply system of the utility model is based on the running condition of the existing hydrogenation station, the reverse filling system is designed, the compressor can be realized not to stop in the hydrogenation trough period, the problem of frequent start and stop of the compressor caused by the hydrogenation centralized period and the idle period is solved, the working load of the compressor can be reduced by more than 45% by adopting the system, and the equipment investment cost is saved by more than 20%;
(2) the supply system of the utility model realizes two supply modes, namely a 'hydrogenation valley period' working mode and a 'hydrogenation peak period' working mode according to the actual situation of the hydrogenation station, and improves the hydrogen side filling rate when dealing with the hydrogenation peak period by the design of the reverse filling system; meanwhile, the utilization rate of hydrogen in the exogenous in-and-out system can be improved by more than 10% by switching the two modes, the hydrogen production scale of the hydrogen station is reduced by 20%, and the hydrogen production system has a good application prospect.
Drawings
Fig. 1 is a schematic flow diagram of a hydrogen production and hydrogenation integrated hydrogenation station supply system provided in embodiment 1 of the present invention.
The system comprises a hydrogen production device 1, a primary compression unit 2, a primary storage unit 3, a secondary compression unit 4, a sequence control panel 5, a secondary storage unit 6, a hydrogenation machine 7, a control system 8, a hydrogen long-tube trailer 9, a primary low-pressure region storage tank 10, a primary high-pressure region storage tank 11, a secondary low-pressure region storage tank 12, a secondary medium-pressure region storage tank 13, a secondary high-pressure region storage tank 14 and a first branch pipeline 15.
The direction of the arrows represents the direction of material flow.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
In the following examples and comparative examples, the "hydrogenation trough period" is specified to be 19: 00-9: 00 the next day for 14 hours; the "hydrogenation peak period" is specified to be 9:00-19:00 for 10 hours.
The filling scale of a hydrogenation station is specified to be 1000kg/d, the average hydrogenation amount in the 'hydrogenation peak period' is 100kg/h, and the maximum hydrogenation amount is 120 kg/h. From equipment design and model selection analysis, in order to meet the hydrogenation requirement of a hydrogen station in a peak period, the secondary compressor is configured to meet the filling amount of 120 kg/h.
The following are typical but non-limiting examples of the utility model:
example 1:
the embodiment provides a supply system of a hydrogen production and hydrogenation integrated hydrogenation station, and the flow diagram of the supply system is shown in fig. 1.
The supply system comprises a hydrogen production system, a compression system, a storage system, a filling system, an external source input system, a reverse filling system and a control system 8;
the compression system comprises a first-stage compression unit 2 and a second-stage compression unit 4;
the hydrogen production system, the primary compression unit 2, the secondary compression unit 4 and the filling system are connected in sequence;
the storage system comprises a primary storage unit 3 and a secondary storage unit 6;
the primary storage unit 3 is connected with an outlet pipeline of the primary compression unit 2; the secondary storage unit 6 is connected with an outlet pipeline of the secondary compression unit 4;
the external source input system is also connected with an outlet pipeline of the primary compression unit 2;
the secondary compression unit 4 is also connected with the primary storage unit 3 through the reverse filling system;
the control system 8 is used for controlling the hydrogen production system, the compression system, the storage system, the filling system and the reverse filling system.
The hydrogen production system comprises a hydrogen production device 1; the first-stage compression unit 2 comprises a first-stage compressor, and the outlet pressure is 25 MPa; the secondary compression unit 4 comprises a secondary compressor, and the outlet pressure is 35 MPa; the external source input system comprises a hydrogen long-tube trailer 9; the filling system comprises a hydrogenation machine 7.
The primary storage unit 3 comprises a primary low-pressure area storage tank 10 and a primary high-pressure area storage tank 11, the volume ratio of the primary low-pressure area storage tank to the primary high-pressure area storage tank is 1:1, and the storage tanks in two pressure intervals are arranged in parallel; 2 primary low-pressure area storage tanks 10 are arranged; 2 first-stage high-pressure area storage tanks 11 are arranged; the highest set pressure of the primary low-pressure area storage tank 10 is 20 MPa; the highest set pressure of the primary high-pressure area storage tank 11 is 35 MPa.
The secondary storage unit 6 comprises a secondary low-pressure area storage tank 12, a secondary medium-pressure area storage tank 13 and a secondary high-pressure area storage tank 14, and the storage tanks in each pressure interval are arranged in parallel; the number of the secondary low-pressure area storage tanks 12 is 1; 1 secondary medium-pressure area storage tank 13 is arranged; 1 second-stage high-pressure area storage tank 14; the maximum bearing pressure of the secondary low-pressure area storage tank 12, the secondary medium-pressure area storage tank 13 and the secondary high-pressure area storage tank 14 is 45 MPa.
The reverse filling system comprises a first branch pipeline 15, and the secondary compressor is connected with the primary high-pressure area storage tank 11 through the first branch pipeline 15;
the control system 8 further comprises a sequence control disc 5 by means of which the secondary compressor will be connected to the secondary storage unit 6.
The supply method adopting the supply system comprises the following working modes:
the hydrogen production device 1 and the primary compressor are always in working states, and a channel between the hydrogen production device 1 and the primary compressor is kept in a normally open state;
the hydrogenation trough period comprises:
firstly, after the peak period of hydrogenation is over, the hydrogenation machine 7 is closed, then the second-stage storage unit 6 is filled and then is closed, and a channel between the second-stage compressor and the hydrogenation machine 7 is closed (at this time, the channel between the first-stage compressor and the second-stage compressor, the channel between the first-stage high-pressure area storage tank 11 and the second-stage compressor, and the channel between the hydrogen long-tube trailer 9 and the second-stage compressor are all in an open state, and the channel between the first-stage compressor and the first-stage low-pressure area storage tank 10 is in a closed state); closing a connecting channel between a primary compressor and a secondary compressor, closing a connecting channel between the primary compressor and a primary high-pressure area storage tank 11, opening a connecting channel between the primary compressor and a primary low-pressure area storage tank 10, filling the primary low-pressure area storage tank 10, opening a first branch pipeline 15 (namely a reverse filling system), and performing one-time reverse filling operation on residual hydrogen (7MPa) in a hydrogen long-tube trailer 9; when the pressure of the hydrogen long-tube trailer 9 is less than 2MPa, closing a channel between the hydrogen long-tube trailer 9 and a secondary compressor, then opening a connecting channel between a primary compressor and a secondary compressor (at the moment, the channel between the primary compressor and a primary low-pressure area storage tank 10 is kept open, and the connecting channel between the primary compressor and a primary high-pressure area storage tank 11 is kept closed), performing secondary reverse filling on the primary high-pressure area storage tank 11 after the hydrogen compressed by the primary compressor and the low-pressure hydrogen in the primary low-pressure area storage tank 10 are subjected to secondary compression; stopping filling when the pressure of the storage tank 10 in the primary low-pressure area reaches 20 MPa; when the pressure of the primary high-pressure area storage tank 11 reaches 35MPa, the reverse filling operation is stopped.
Before the hydrogenation peak period comes, the connecting channel between the secondary compressor and the hydrogenation machine 7 is in a closed state, and the supply system is in recharging operation; when the hydrogenation peak period comes, the hydrogenation peak period comprises:
(1) the secondary low-pressure area storage tank 12 is opened for filling; when the hydrogenation rate is lower than 4kg/min, closing the secondary low-pressure area storage tank 12, and opening the secondary medium-pressure area storage tank 13 for filling; when the hydrogenation rate is lower than 4kg/min again, closing the secondary medium-pressure area storage tank 13, and opening the secondary high-pressure area storage tank 14 for filling; (2) when the hydrogenation rate is lower than 4kg/min again, the reverse filling system is closed (namely the first branch pipeline 15 and a connecting channel between the primary compressor and the primary low-pressure area storage tank 10 are closed), a channel between the secondary compressor and the hydrogenation machine 7 is opened, and the hydrogenation rate is increased; (3) when the inlet pressure of the secondary compressor is less than 25MPa again, opening the storage tank 11 of the primary high-pressure area, and increasing the inlet pressure of the secondary compressor; (4) and when the inlet pressure of the secondary compressor is less than 8MPa, opening the hydrogen long-tube trailer 9 and increasing the inlet pressure of the secondary compressor.
Example 2:
the embodiment provides a supply system of a hydrogen production and hydrogenation integrated hydrogenation station, which comprises a hydrogen production system, a compression system, a storage system, a filling system, an external source input system, a reverse filling system and a control system 8;
the compression system comprises a first-stage compression unit 2 and a second-stage compression unit 4;
the hydrogen production system, the primary compression unit 2, the secondary compression unit 4 and the filling system are connected in sequence;
the storage system comprises a primary storage unit 3 and a secondary storage unit 6;
the primary storage unit 3 is connected with an outlet pipeline of the primary compression unit 2; the secondary storage unit 6 is connected with an outlet pipeline of the secondary compression unit 4;
the external source input system is also connected with an outlet pipeline of the primary compression unit 2;
the secondary compression unit 4 is also connected with the primary storage unit 3 through the reverse filling system;
the control system 8 is used for controlling the hydrogen production system, the compression system, the storage system, the filling system and the reverse filling system.
The hydrogen production system comprises a hydrogen production device 1; the first-stage compression unit 2 comprises a first-stage compressor, and the outlet pressure is 25 MPa; the secondary compression unit 4 comprises a secondary compressor, and the outlet pressure is 40 MPa; the external source input system comprises a hydrogen long-tube trailer 9; the filling system comprises a hydrogenation machine 7.
The primary storage unit 3 comprises a primary low-pressure area storage tank 10 and a primary high-pressure area storage tank 11, the volume ratio of the primary low-pressure area storage tank to the primary high-pressure area storage tank is 1:1, and the storage tanks in two pressure intervals are arranged in parallel; 2 primary low-pressure area storage tanks 10 are arranged; 2 first-stage high-pressure area storage tanks 11 are arranged; the highest set pressure of the primary low-pressure area storage tank 10 is 20 MPa; the highest set pressure of the primary high-pressure area storage tank 11 is 40 MPa.
The secondary storage unit 6 comprises a secondary low-pressure area storage tank 12, a secondary medium-pressure area storage tank 13 and a secondary high-pressure area storage tank 14, and the storage tanks in each pressure interval are arranged in parallel; the number of the secondary low-pressure area storage tanks 12 is 1; 1 secondary medium-pressure area storage tank 13 is arranged; 1 second-stage high-pressure area storage tank 14; the maximum bearing pressure of the secondary low-pressure area storage tank 12, the secondary medium-pressure area storage tank 13 and the secondary high-pressure area storage tank 14 is 45 MPa.
The reverse filling system comprises a first branch pipeline 15, and the secondary compressor is connected with the primary high-pressure area storage tank 11 through the first branch pipeline 15;
the control system 8 further comprises a sequence control disc 5 by means of which the secondary compressor will be connected to the secondary storage unit 6.
The supply method adopting the supply system comprises the following working modes:
the hydrogen production device 1 and the primary compressor are always in working states, and a channel between the hydrogen production device 1 and the primary compressor is kept in a normally open state;
the hydrogenation trough period comprises:
firstly, after the peak period of hydrogenation is over, the hydrogenation machine 7 is closed, then the second-stage storage unit 6 is filled and then is closed, and a channel between the second-stage compressor and the hydrogenation machine 7 is closed (at this time, the channel between the first-stage compressor and the second-stage compressor, the channel between the first-stage high-pressure area storage tank 11 and the second-stage compressor, and the channel between the hydrogen long-tube trailer 9 and the second-stage compressor are all in an open state, and the channel between the first-stage compressor and the first-stage low-pressure area storage tank 10 is in a closed state); closing a connecting channel between a primary compressor and a secondary compressor, closing a connecting channel between the primary compressor and a primary high-pressure area storage tank 11, opening a connecting channel between the primary compressor and a primary low-pressure area storage tank 10, filling the primary low-pressure area storage tank 10, opening a first branch pipeline 15 (namely a reverse filling system), and performing one-time reverse filling operation on residual hydrogen (10MPa) in a hydrogen long-tube trailer 9; when the pressure of the hydrogen long-tube trailer 9 is less than 1MPa, closing a channel between the hydrogen long-tube trailer 9 and a secondary compressor, then opening a connecting channel between a primary compressor and the secondary compressor (at the moment, the channel between the primary compressor and a primary low-pressure area storage tank 10 is kept open, and the connecting channel between the primary compressor and a primary high-pressure area storage tank 11 is kept closed), filling the primary low-pressure area storage tank 10 with the hydrogen compressed by the primary compressor, and performing secondary reverse filling on the primary high-pressure area storage tank 11; stopping filling when the pressure of the storage tank 10 in the primary low-pressure area reaches 20 MPa; when the pressure of the primary high-pressure area storage tank 11 reaches 40MPa, the reverse filling operation is stopped.
Before the hydrogenation peak period comes, the connecting channel between the secondary compressor and the hydrogenation machine 7 is in a closed state, and the supply system is in recharging operation; when the hydrogenation peak period comes, the hydrogenation peak period comprises:
(1) the secondary low-pressure area storage tank 12 is opened for filling; when the hydrogenation rate is lower than 5kg/min, closing the secondary low-pressure area storage tank 12, and opening the secondary medium-pressure area storage tank 13 for filling; when the hydrogenation rate is lower than 5kg/min again, closing the secondary medium-pressure area storage tank 13, and opening the secondary high-pressure area storage tank 14 for filling; (2) when the hydrogenation rate is lower than 5kg/min again, the reverse filling system is closed (namely the first branch pipeline 15 and a connecting channel between the primary compressor and the primary low-pressure area storage tank 10 are closed), a channel between the secondary compressor and the hydrogenation machine 7 is opened, and the hydrogenation rate is increased; (3) when the inlet pressure of the secondary compressor is less than 20MPa, opening the primary low-pressure area storage tank 10 to improve the inlet pressure of the secondary compressor; when the inlet pressure of the secondary compressor is less than 20MPa again, closing the primary low-pressure area storage tank 10, opening the primary high-pressure area storage tank 11, and increasing the inlet pressure of the secondary compressor; (4) and when the inlet pressure of the secondary compressor is less than 7MPa, opening the hydrogen long-tube trailer 9 and increasing the inlet pressure of the secondary compressor.
Comparative example 1:
this comparative example provides a hydrogen production and hydrogenation integrated hydrogen station supply system, which is referenced to the supply system in example 1, except that: the supply system does not comprise a reverse filling system, i.e. does not comprise the first branch line 15. And because there is no reverse-filling system, the primary storage unit 3 comprises only the primary low-pressure-region storage tank 10, and the primary high-pressure-region storage tank 11 is not required to be arranged; in addition, in order to keep the filling quantity constant, the number of the storage tanks 10 in the first-stage low-pressure area needs to be increased by 6, the selection of the two-stage compressor needs to be increased (the actual volume flow needs to be increased by 5.79Nm converted into the actual volume flow under the average pressure3/h)。
The supply method adopting the supply system comprises the following working modes:
the hydrogen production device 1 and the primary compressor are always in working states, and a channel between the hydrogen production device 1 and the primary compressor is kept in a normally open state;
the hydrogenation trough period comprises:
firstly, after the hydrogenation peak time period is over, the hydrogenation machine 7 is closed, and then the secondary storage unit 6 is fully filled and then closed; the passage between the secondary compressor and the hydrotreater 7 is then closed and the secondary compressor is shut down (while the passage between the primary compressor and the primary low pressure zone storage tank remains open).
The hydrogenation peak period comprises:
(1) the secondary low-pressure area storage tank 12 is opened for filling; when the hydrogenation rate is lower than 4kg/min, closing the secondary low-pressure area storage tank 12, and opening the secondary medium-pressure area storage tank 13 for filling; when the hydrogenation rate is lower than 4kg/min again, closing the secondary medium-pressure area storage tank 13, and opening the secondary high-pressure area storage tank 14 for filling; (2) when the hydrogenation rate is lower than 4kg/min again, opening a channel between the secondary compressor and the hydrogenation machine 7, starting the secondary compressor, and increasing the hydrogenation rate; (3) and when the inlet pressure of the secondary compressor is less than 8MPa, opening the hydrogen long-tube trailer 9 and increasing the inlet pressure of the secondary compression unit 4.
Comparing the supply method implemented in example 1 with that implemented in comparative example 1, when the flow rate of the load of the secondary compressor is 120kg/h, the working load of the secondary compressor is reduced by 45% because the inlet pressure of the secondary compressor is greatly increased by the reverse filling system in example 1, and further, the equipment investment cost is reduced by 25%; in addition, the utilization rate of the external source input system is improved by 10 percent. Meanwhile, in the case that the downstream user is unstable, the situation that the secondary compressor is repeatedly started and stopped can occur, so that the parts such as the diaphragm of the compressor are damaged, the maintenance cost is increased, and the service life of the equipment is shortened.
It can be seen from the above embodiments and comparative examples that the supply system of the present invention is designed based on the operation of the existing hydrogenation station, and the reverse filling system can realize that the compressor is not stopped in the hydrogenation trough period, and solve the problem of frequent start and stop of the compressor caused by the concentrated hydrogenation period and the idle period, and the system can reduce the work load of the compressor by more than 45%, save the equipment investment cost by more than 25%, improve the service life of the compressor, and reduce the maintenance cost; the supply system realizes two supply modes, namely a 'hydrogenation valley period' working mode and a 'hydrogenation peak period' working mode according to the actual situation of the hydrogenation station, and realizes 'cross-time' hydrogen storage by using the reverse filling system, so that the hydrogen filling rate is improved when the hydrogen peak period is met; meanwhile, the utilization rate of hydrogen in the exogenous in-and-out system can be improved by more than 10% by switching the two modes, the hydrogen production scale of the hydrogen station is reduced by 20%, and the hydrogen production system has a good application prospect.
The applicant states that the present invention is illustrated by the above embodiments of the supply system of the present invention, but the present invention is not limited to the above supply system, i.e. it does not mean that the present invention has to rely on the above supply system for implementation. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents thereof, additions of additional operations, selection of specific ways, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The supply system of the hydrogen production and hydrogenation integrated hydrogenation station is characterized by comprising a hydrogen production system, a compression system, a storage system, a filling system, an external source input system, a reverse filling system and a control system;
the compression system comprises a first-stage compression unit and a second-stage compression unit;
the hydrogen production system, the primary compression unit, the secondary compression unit and the filling system are connected in sequence;
the storage system comprises a primary storage unit and a secondary storage unit;
the primary storage unit is connected with an outlet pipeline of the primary compression unit; the secondary storage unit is connected with an outlet pipeline of the secondary compression unit;
the external source input system is also connected with an outlet pipeline of the primary compression unit;
the secondary compression unit is also connected with the primary storage unit through the reverse filling system;
the control system is used for controlling the hydrogen production system, the compression system, the storage system, the filling system and the reverse filling system.
2. The hydrogen-producing and hydrogenating integrated hydrogen station supply system according to claim 1, wherein the hydrogen-producing system comprises a hydrogen-producing device.
3. The hydrogen-producing and hydrogenating integrated hydrogen station supply system according to claim 1, wherein the primary compression unit comprises a primary compressor;
the secondary compression unit includes a secondary compressor.
4. The hydrogen-producing and hydrogenating integrated hydrogen station supply system according to claim 1, wherein the external source input system comprises a hydrogen long pipe trailer.
5. The hydrogen-producing and hydrogenating integrated hydrogen station supply system according to claim 1, wherein the filling system comprises a hydrogenation machine.
6. The hydrogen production and hydrogenation integrated hydrogenation station supply system according to claim 3, wherein the primary storage unit comprises storage tanks with at least 2 pressure intervals, and the storage tanks in each pressure interval are arranged in parallel;
the primary storage unit comprises a primary low-pressure area storage tank and a primary high-pressure area storage tank;
the number of the primary low-pressure area storage tanks is at least 1;
the number of the first-level high-pressure area storage tanks is at least 1.
7. The hydrogen production and hydrogenation integrated hydrogenation station supply system as claimed in claim 6, wherein the set pressure of the primary low-pressure area storage tank is 5-20 MPa;
the set pressure of the first-level high-pressure area storage tank is 25-45 MPa.
8. The hydrogen production and hydrogenation integrated hydrogenation station supply system according to claim 1, wherein the secondary storage unit comprises storage tanks with at least 2 pressure intervals, and the storage tanks in each pressure interval are arranged in parallel;
the secondary storage unit comprises a secondary low-pressure area storage tank, a secondary medium-pressure area storage tank and a secondary high-pressure area storage tank;
the number of the secondary low-pressure area storage tanks is at least 1;
at least 1 secondary medium-pressure area storage tank is arranged;
the number of the secondary high-pressure area storage tanks is at least 1;
the maximum bearing pressure of the secondary low-pressure area storage tank, the secondary medium-pressure area storage tank and the secondary high-pressure area storage tank is less than or equal to 45 MPa.
9. The hydrogen production and hydrogenation integrated hydrogen station supply system according to claim 6, wherein the reverse filling system comprises a first branch pipeline, and the secondary compressor is connected with the primary high-pressure area storage tank through the first branch pipeline.
10. The hydrogen-producing and hydrogenating integrated hydrogen station supply system according to claim 3, wherein the control system further comprises a sequence control panel, and the secondary compressor is connected with the secondary storage unit through the sequence control panel.
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