Hydrogen production and hydrogenation station cooling system based on multi-cold source coupling and regulation method

Abstract

The application discloses a hydrogen production and hydrogenation station cooling system and a regulation and control method based on multi-cold-source coupling. The cooling water circuits of heat exchangers of compressors and hydrogenation machines are connected in parallel to form a first parallel connection group. Cooling water units corresponding to the heat exchangers and the compressors are connected in parallel to form a second parallel connection group. The cooling water pipelines between a hydrogen production device and a cooling tower are connected to the first parallel connection group. Cooling water inlet bypasses are arranged between the heat exchangers or each compressor and cooling water inlet linkage valves arranged at cooling water inlets of the heat exchangers or each compressor. Each cooling water inlet bypass is provided with an inlet bypass linkage valve and is connected to an inlet bypass main pipeline. Cooling water outlet bypasses are formed through three-way connections between cooling water outlet temperature transmitters and cooling water outlet control valves of the heat exchangers and each compressor. Each cooling water outlet bypass is provided with an outlet bypass control valve and is connected to an outlet bypass main pipeline. The inlet bypass main pipeline and the outlet bypass main pipeline are connected to the second parallel connection group. The application makes the hydrogen production and hydrogenation station cooling system operate more efficiently and stably.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production and hydrogenation station construction, in particular to a hydrogen production and hydrogenation station cooling system based on multi-cold-source coupling and a control method. BACKGROUND

[0002] During the operation of the hydrogen production and hydrogenation station, the hydrogen production device, the compressor and the hydrogenation machine will generate a large amount of heat. In order to ensure the safe operation of the equipment, a cooling system needs to be provided for the equipment to reduce the temperature during the operation of the above-mentioned equipment. The current hydrogen production and hydrogenation station cooling system generally adopts a split architecture design, which specifically shows that:

[0003] 1. Discrete configuration of cold sources: the hydrogen production unit (including natural gas reforming hydrogen production device and water electrolysis hydrogen production device) uses a cooling tower as a cold source, and the hydrogen compressor set and the hydrogenation machine heat exchanger are independently configured with a water chiller system.

[0004] 2. Isolation of equipment cold sources: according to the principle of "one machine one cold source", a water chiller is separately configured for each compressor set and hydrogenation machine heat exchanger to form multiple independently operated cooling subsystems.

[0005] 3. Lack of system coordination: there is no load allocation mechanism between the cold source systems, and the cold energy cannot be complemented and the standby redundancy cannot be realized.

[0006] 4. Bottlenecks of energy efficiency and reliability: the low running load rate of the refrigeration equipment leads to a decrease in overall energy efficiency, and the single fault point design affects the continuous operation reliability of the system.

[0007] Due to the above-mentioned defects of the prior art, the following problems often occur in the prior art:

[0008] 1. In the case of low ambient temperature, the cooling tower return water temperature is low, and the cold energy in the air cannot be utilized to the maximum extent.

[0009] 2. In the case of low ambient temperature, the water chiller operates at low load for a long time, which is low in efficiency.

[0010] 3. The "one machine one cold source" setting of the hydrogen compressor set and the hydrogenation machine heat exchanger, if the corresponding water chiller equipment fails, there is no effective standby system, which leads to equipment downtime and affects the operation of the hydrogen production and hydrogenation station.

[0011] Therefore, how to make the hydrogen production and hydrogenation integrated station cooling system more efficient and stable has become a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0012] In view of the above-mentioned defects of the prior art, the present application provides a hydrogen production and hydrogenation station cooling system based on multi-cold-source coupling and a control method, which realizes the purpose of making the hydrogen production and hydrogenation integrated station cooling system more efficient and stable.

[0013] To achieve the above object, the application discloses a hydrogen production and hydrogenation station cooling system based on multi-cold source coupling, which comprises a hydrogen production device and a hydrogenation machine for hydrogen injection.

[0014] Three or more than three gas storage tanks are arranged in series between the hydrogen production device and the hydrogenation machine, and a compressor is arranged between every two gas storage tanks, and a heat exchanger of the hydrogenation machine is connected in series between the last gas storage tank and the hydrogenation machine.

[0015] Cooling water circuits of all the compressors and the heat exchanger are connected in parallel to form a first parallel group.

[0016] A cold water unit is arranged corresponding to the heat exchanger and each of the compressors, and all the cold water units are connected in parallel to form a second parallel group.

[0017] The cooling water pipeline between the hydrogen production device and the cooling tower is connected with the first parallel group.

[0018] Cooling water inlets of the heat exchanger and each of the compressors are provided with cooling water inlet linkage valves, and cooling water outlets are sequentially provided with cooling water outlet temperature transmitters and cooling water outlet control valves.

[0019] The heat exchanger or each of the compressors and the corresponding cooling water inlet linkage valve are connected through a tee joint to form a cooling water inlet bypass.

[0020] Each of the cooling water inlet bypasses is provided with a bypass inlet linkage valve and is connected with an inlet bypass main pipeline.

[0021] The inlet bypass main pipeline is provided with an inlet bypass temperature transmitter.

[0022] Each of the cooling water outlet temperature transmitters and the corresponding cooling water outlet control valve is connected through a tee joint to form a cooling water outlet bypass.

[0023] Each of the cooling water outlet bypasses is provided with a bypass outlet control valve and is connected with an outlet bypass main pipeline.

[0024] The outlet bypass main pipeline is provided with an outlet bypass temperature transmitter.

[0025] The inlet bypass main pipeline and the outlet bypass main pipeline are connected with the second parallel group.

[0026] Cooling water inlets of each of the cold water units are provided with cold water unit inlet valves, and cooling water outlets are provided with cold water unit outlet valves.

[0027] Preferably, cooling water inlets and cooling water outlets of the hydrogen production device and the cooling tower are respectively provided with cooling water main valves.

[0028] A total pipe linkage valve is arranged on the cooling water pipe at a position between two connection points connected with the water inlet and outlet of the first parallel group;

[0029] The pipe for water inlet of the first parallel group and the cooling water pipe is provided with a water inlet total pipe temperature transmitter;

[0030] The pipe for water outlet of the first parallel group and the cooling water pipe is provided with a water outlet total pipe temperature transmitter;

[0031] The pipe for water return between the hydrogen production device and the cooling tower is provided with a water return total pipe temperature transmitter.

[0032] The application also provides a regulation method for the above-mentioned hydrogen production and hydrogenation station cooling system based on multi-cold source coupling, and the regulation process between the hydrogen production device and the cooling tower is as follows:

[0033] Step A1, the hydrogen production device is started;

[0034] Step A2, the cooling tower is started;

[0035] Step A3, all cooling water total valves of the cooling water inlet and outlet of the hydrogen production device and the cooling tower are opened;

[0036] Step A4, the opening degree of the total pipe linkage valve is controlled through the water outlet total pipe temperature transmitter interlocking;

[0037] Step A5, whether the data collected by the water outlet total pipe temperature transmitter is equal to the preset value T5 is judged;

[0038] If the data collected by the water outlet total pipe temperature transmitter is equal to the preset value T5, steps A3 to A5 are repeatedly executed;

[0039] If the data collected by the water outlet total pipe temperature transmitter is not equal to the preset value T5, step A6 is executed;

[0040] Step A6, the user is warned that the cooling tower is overloaded, and the hydrogen production device is stopped.

[0041] Preferably, the preset value T5 is 25℃±5%.

[0042] Preferably, two compressors and three water chillers are included;

[0043] All the compressors are sequentially numbered from the hydrogen production device to the hydrogenation machine,

[0044] The water chillers corresponding to the compressors are also numbered in the same way, and the maximum number of the water chillers is added by 1 to serve as the number of the water chillers corresponding to the heat exchanger,

[0045] And when the cooling tower is in the starting state, each of the compressors is regulated according to the following steps:

[0046] Step B1, starting the first compressor;

[0047] Step B2, judging whether the cooling tower is in the working state;

[0048] If the cooling tower is in the working state, step B3 is executed;

[0049] If the cooling tower is not in the working state, step B7 is executed;

[0050] Step B3, judging whether the data collected by the water inlet pipe temperature transmitter is less than or equal to the preset value T0 and the data collected by the water outlet pipe temperature transmitter is less than or equal to the preset value T1;

[0051] If the data collected by the water inlet pipe temperature transmitter is less than or equal to the preset value T0 and the data collected by the water outlet pipe temperature transmitter is less than or equal to the preset value T1, step B4 is executed;

[0052] If the data collected by the water inlet pipe temperature transmitter is greater than the preset value T0 or the data collected by the water outlet pipe temperature transmitter is greater than the preset value T1, step B7 is executed;

[0053] Step B4, opening the cooling water outlet control valve of the first compressor and using the cooling water outlet temperature transmitter of the first compressor to interlock control the opening degree of the cooling water inlet linkage valve of the first compressor;

[0054] Step B5, judging whether the data collected by the cooling water outlet temperature transmitter of the first compressor is less than or equal to the preset value T3;

[0055] If the data collected by the cooling water outlet temperature transmitter of the first compressor is less than or equal to the preset value T3, return to step B2;

[0056] If the data collected by the cooling water outlet temperature transmitter of the first compressor is greater than the preset value T3, step B6 is executed;

[0057] Step B6, issuing an alarm of the overload of the compressor to the user, closing the first compressor, and ending all processes;

[0058] Step B7, judging whether all the cold water units are in the running state;

[0059] If all the cold water units are in the running state, step B8 is executed;

[0060] If any of the water chiller units is not in operation, step B10 is executed;

[0061] Step B8, judging whether the data collected by the inlet water bypass temperature transmitter is less than or equal to the preset value T2 and the data collected by the outlet water bypass temperature transmitter is less than or equal to the preset value T4;

[0062] If the data collected by the inlet water bypass temperature transmitter is less than or equal to the preset value T2 and the data collected by the outlet water bypass temperature transmitter is less than or equal to the preset value T4, step B9 is executed;

[0063] If the data collected by the inlet water bypass temperature transmitter is greater than the preset value T2 or the data collected by the outlet water bypass temperature transmitter is greater than the preset value T4, step B11 is executed;

[0064] Step B9, opening the bypass outlet water control valve of the first water chiller unit, and using the cooling water outlet temperature transmitter of the first water chiller unit to control the opening degree of the bypass inlet water linkage valve of the first water chiller unit, and then executing step B5;

[0065] Step B10, starting all the water chiller units in order from small to large according to the number, if the starting is successful, opening the corresponding water chiller unit inlet water valve and water chiller unit outlet water valve, and executing step B9;

[0066] If all the water chiller units are not successfully started, the user is warned of the failure of the water chiller unit, the first water chiller unit is closed, and all processes are ended;

[0067] Step B11, judging whether the first water chiller unit is in operation;

[0068] If the first water chiller unit is in operation, step B12 is executed;

[0069] If the first water chiller unit is not in operation, step B10 is executed;

[0070] Step B12, judging whether the second water chiller unit is in operation;

[0071] If the second water chiller unit is in operation, step B13 is executed;

[0072] If the second water chiller unit is not in operation, step B14 is executed;

[0073] Step B13, judging whether the third water chiller unit is in operation;

[0074] If the third water chiller unit is in operation, step B6 is executed;

[0075] If the third water chiller unit is not in operation, step B15 is executed;

[0076] Step B14, according to the number from the second chiller unit, start all the chiller units from small to large, if the start is successful, open the corresponding chiller unit water inlet valve and chiller unit water outlet valve, and execute step B9;

[0077] If all the chiller units are not started successfully, the user is warned of the failure of the chiller unit, the first compressor is closed, and all processes are ended;

[0078] Step B15, start the third chiller unit, if the start is successful, open the corresponding chiller unit water inlet valve and chiller unit water outlet valve, and execute step B9;

[0079] If the third chiller unit is not started successfully, step B16 is executed to warn the user of the failure of the chiller unit, the first compressor is closed, and all processes are ended.

[0080] More preferably, the preset value T0 is 10℃±5%; the preset value T1 is 30℃±5%; the preset value T2 is 15℃±5%; and the preset value T4 is 20℃±5%.

[0081] The beneficial effects of the present application are:

[0082] 1. Energy efficiency improvement: under the premise of meeting the cooling demand of the hydrogen production device, part of the cold energy is used for hydrogen compressor and hydrogen cooling, the cooling tower water supply and return temperature difference is improved, and the energy consumption is reduced;

[0083] 2. Reliability enhancement: without increasing the main cold source equipment, multiple backup modes are set by using existing equipment, and the system operation reliability is improved;

[0084] 3. Intelligent upgrade: real-time acquisition of entire system equipment operation parameters, issuance of equipment control instructions according to control requirements, control of related equipment operation, and realization of whole process automatic control;

[0085] 4. Increase economic benefits: reduce energy consumption, prolong equipment service life, and reduce equipment maintenance cost.

[0086] The concept, specific structure and technical effects of the present application will be further described below with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0087] Figure 1 The structure schematic diagram of an embodiment of the present application is shown.

[0088] Figure 2 The connection structure schematic diagram of the compressor and the chiller unit in an embodiment of the present application is shown.

[0089] Figure 3 The working process of hydrogen production and hydrogenation is shown in an embodiment of the application.

[0090] Figure 4 The working process of the compressor is shown in an embodiment of the application. DETAILED DESCRIPTION

[0091] Embodiment: As shown in Figure 1 and Figure 2 The hydrogen production and hydrogenation station cooling system based on multi-cold source coupling includes a hydrogen production device 1 and a hydrogenation machine 7 for injecting hydrogen into a refueling equipment 6.

[0092] More than three gas storage tanks 2 are arranged in series between the hydrogen production device 1 and the hydrogenation machine 7, and a compressor 3 is arranged between every two gas storage tanks 2, and a heat exchanger 71 of the hydrogenation machine 7 is connected in series between the last gas storage tank 2 and the hydrogenation machine 7.

[0093] The cooling water circuits of all the compressors 3 and the heat exchanger 71 are connected in parallel to form a first parallel group.

[0094] A water chiller 4 is arranged corresponding to the heat exchanger 71 and each compressor 3, and all the water chillers 4 are connected in parallel to form a second parallel group.

[0095] The cooling water pipeline 12 between the hydrogen production device 1 and the cooling tower 11 is connected to the first parallel group.

[0096] The cooling water inlet of the heat exchanger 71 and each compressor 3 is provided with a cooling water inlet linkage valve TCV1, TCV3, TCV5, and the cooling water outlet is provided with a cooling water outlet temperature transmitter TT6, TT7, TT8 and a cooling water outlet control valve KV7, KV9, KV11 in sequence.

[0097] The heat exchanger 71 or each compressor 3 and the corresponding cooling water inlet linkage valve TCV1, TCV3, TCV5 are connected through a three-way to form a cooling water inlet bypass.

[0098] Each cooling water inlet bypass is provided with a bypass inlet linkage valve TCV2, TCV4, TCV6 and connected to an inlet bypass main pipeline.

[0099] The inlet bypass main pipeline is provided with an inlet bypass temperature transmitter TT4.

[0100] Each cooling water outlet temperature transmitter TT6, TT7, TT8 and the corresponding cooling water outlet control valve KV7, KV9, KV11 are connected through a three-way to form a cooling water outlet bypass.

[0101] Each cooling water outlet bypass is provided with a bypass outlet control valve KV8, KV10, KV12 and connected to an outlet bypass main pipeline.

[0102] The water outlet bypass main pipe is provided with a water outlet bypass temperature transmitter TT5;

[0103] The water inlet bypass main pipe is connected with the water outlet bypass main pipe, and a second parallel group is connected between the water inlet bypass main pipe and the water outlet bypass main pipe;

[0104] The cooling water inlet of each water chiller 4 is provided with a water chiller water inlet valve KV1, KV3, KV5, and the cooling water outlet is provided with a water chiller water outlet valve KV2, KV4, KV6.

[0105] The present application is provided with a bypass on the cooling water pipeline 12 between the cooling tower 11 and the hydrogen production device 1, and is led to the heat exchanger 71 of the compressor 3 and the hydrogenation machine 7 respectively.

[0106] In some embodiments, the cooling water inlet and the cooling water outlet of the hydrogen production device 1 and the cooling tower 11 are respectively provided with cooling water main valves KV13, KV14, KV15, KV16;

[0107] The main pipe linkage valve TCV7 is arranged on the cooling water pipeline 12 between the two connection points connected with the water inlet and the water outlet of the first parallel group;

[0108] The pipeline for the water inlet of the first parallel group and the cooling water pipeline 12 is provided with a water inlet main pipe temperature transmitter TT1;

[0109] The pipeline for the water outlet of the first parallel group and the cooling water pipeline 12 is provided with a water outlet main pipe temperature transmitter TT2;

[0110] The pipeline for the water outlet of the first parallel group and the cooling water pipeline 12 is provided with a water outlet main pipe temperature transmitter TT2;

[0111] As shown in the accompanying drawings, Figure 3 The present application also provides a control method for the above-mentioned hydrogen production and hydrogenation station cooling system based on multi-cold source coupling, and the control process between the hydrogen production device 1 and the cooling tower 11 is as follows:

[0112] Step A1, the hydrogen production device 1 is started;

[0113] Step A2, the cooling tower 11 is started;

[0114] Step A3, all cooling water main valves KV13, KV14, KV15, KV16 of the cooling water inlet and the cooling water outlet of the hydrogen production device 1 and the cooling tower 11 are opened;

[0115] Step A4, the opening degree of the main pipe linkage valve TCV7 is controlled through the water outlet main pipe temperature transmitter TT2 interlocking;

[0116] Step A5, whether the data collected by the water outlet main pipe temperature transmitter TT2 is equal to the preset value T5 is judged;

[0117] If the data collected by the outlet main pipe temperature transmitter TT2 is equal to the preset value T5, then repeat steps A3 to A5;

[0118] If the data collected by the outlet main pipe temperature transmitter TT2 is not equal to the preset value T5, step A6 is executed;

[0119] Step A6: Send an alarm to the user that the cooling tower 11 is overloaded, and the hydrogen production device 1 is shut down.

[0120] In practical applications, the present invention can automatically adjust each valve through a central controller and multiple temperature sensors, and adjust the operation of the hydrogen production and refueling station cooling energy supply system in real time according to the optimized control logic based on the operation control plan of the hydrogen production and refueling station cooling system.

[0121] In some embodiments, the preset value T5 is 25° C.±5%.

[0122] like Figure 4 As shown, in some embodiments, two compressors 3 and three chillers 4 are included;

[0123] From the hydrogen production device 1 to the hydrogenation machine 7, all compressors 3 are numbered in sequence.

[0124] Then assign the same number to the chiller 4 corresponding to the compressor 3, and add 1 to the largest number of the chiller 4 as the number of the chiller 4 corresponding to the heat exchanger 71.

[0125] When the cooling tower 11 is in the startup state, each compressor 3 is regulated according to the following steps:

[0126] Step B1, starting the first compressor 3;

[0127] Step B2: determine whether the cooling tower 11 is in working condition;

[0128] If the cooling tower 11 is in operation, execute step B3;

[0129] If the cooling tower 11 is not in operation, execute step B7;

[0130] Step B3: Determine whether the data collected by the water inlet main pipe temperature transmitter TT1 is less than or equal to the preset value T0, and whether the data collected by the water outlet main pipe temperature transmitter TT2 is less than or equal to the preset value T1;

[0131] If the data collected by the water inlet main pipe temperature transmitter TT1 is less than or equal to the preset value T0, and the data collected by the water outlet main pipe temperature transmitter TT2 is less than or equal to the preset value T1, then execute step B4;

[0132] If the data collected by the inlet water main temperature transmitter TT1 is greater than the preset value T0, or the data collected by the outlet water main temperature transmitter TT2 is greater than the preset value T1, step B7 is executed;

[0133] Step B4, open the cooling water outlet control valve KV7 of the first compressor 3, and use the cooling water outlet temperature transmitter TT6 of the first compressor 3 to interlock control the opening degree of the cooling water inlet linkage valve TCV1 of the first compressor 3;

[0134] Step B5, judge whether the data collected by the cooling water outlet temperature transmitter TT6 of the first compressor 3 is less than or equal to the preset value T3;

[0135] If the data collected by the cooling water outlet temperature transmitter TT6 of the first compressor 3 is less than or equal to the preset value T3, return to step B2;

[0136] If the data collected by the cooling water outlet temperature transmitter TT6 of the first compressor 3 is greater than the preset value T3, step B6 is executed;

[0137] Step B6, issue an alarm to the user that the compressor 3 is overloaded, close the first compressor 3, and end all processes;

[0138] Step B7, judge whether all the water chillers 4 are in a running state;

[0139] If all the water chillers 4 are in a running state, step B8 is executed;

[0140] If any water chiller 4 is not in a running state, step B10 is executed;

[0141] Step B8, judge whether the data collected by the inlet water bypass temperature transmitter TT4 is less than or equal to the preset value T2, and whether the data collected by the outlet water bypass temperature transmitter TT5 is less than or equal to the preset value T4;

[0142] If the data collected by the inlet water bypass temperature transmitter TT4 is less than or equal to the preset value T2, and the data collected by the outlet water bypass temperature transmitter TT5 is less than or equal to the preset value T4, step B9 is executed;

[0143] If the data collected by the inlet water bypass temperature transmitter TT4 is greater than the preset value T2, or the data collected by the outlet water bypass temperature transmitter TT5 is greater than the preset value T4, step B11 is executed;

[0144] Step B9, open the bypass outlet water control valve KV8 of the first compressor 3, and use the cooling water outlet temperature transmitter TT6 of the first compressor 3 to interlock control the opening degree of the bypass inlet linkage valve TCV2 of the first compressor 3, and then execute step B5;

[0145] Step B10, start all the water chillers 4 in order from small to large according to the number, if the start is successful, open the corresponding water chiller inlet valve KV1, KV3, KV5 and water chiller outlet valve KV2, KV4, KV6, and execute step B9;

[0146] If all the water chillers 4 fail to start, an alarm of water chiller 4 failure is sent to the user, the first compressor 3 is closed at the same time, and all the processes are ended;

[0147] Step B11, judge whether the first water chiller 4 is running;

[0148] If the first water chiller 4 is running, execute step B12;

[0149] If the first water chiller 4 is not running, execute step B10;

[0150] Step B12, judge whether the second water chiller 4 is running;

[0151] If the second water chiller 4 is running, execute step B13;

[0152] If the second water chiller 4 is not running, execute step B14;

[0153] Step B13, judge whether the third water chiller 4 is running;

[0154] If the third water chiller 4 is running, execute step B6;

[0155] If the third water chiller 4 is not running, execute step B15;

[0156] Step B14, start all the water chillers 4 in order from the second water chiller 4, from small to large according to the number, if the start is successful, open the corresponding water chiller inlet valve KV3, KV5 and water chiller outlet valve KV4, KV6, and execute step B9;

[0157] If all the water chillers 4 fail to start, an alarm of water chiller 4 failure is sent to the user, the first compressor 3 is closed at the same time, and all the processes are ended;

[0158] Step B15, start the third water chiller 4, if the start is successful, open the corresponding water chiller inlet valve KV5 and water chiller outlet valve KV6, and execute step B9;

[0159] If the third water chiller 4 fails to start, execute step B16 to send an alarm of water chiller 4 failure to the user, the first compressor 3 is closed at the same time, and all the processes are ended.

[0160] In some embodiments, the preset value T0 is 10℃±5%; the preset value T1 is 30℃±5%; the preset value T2 is 15℃±5%; and the preset value T4 is 20℃±5%.

[0161] As shown in Figure 3 and Figure 4 The cooling tower 11 mainly serves as a cold source of the hydrogen production device. When the hydrogen production device is started, the cooling tower 11 is started, all cooling water total valves KV13, KV14, KV15 and KV16 are opened, the central controller monitors the values of the inlet water total pipe temperature transmitter TT1 and the outlet water total pipe temperature transmitter TT2 in real time, controls the opening degree of the total pipe linkage valve TCV7 through the outlet water total pipe temperature transmitter TT2, controls the amount of cooling water entering the hydrogen production device, and meets the cooling demand of the hydrogen production device; at the same time, the running state of the cooling tower 11 is adjusted to reduce energy consumption.

[0162] When the first compressor 3 needs to be started, the central controller first determines whether the cooling tower 11 is running. If the cooling tower 11 is running, the central controller determines whether the excess cold energy of the cooling tower 11 can meet the cooling demand of the first compressor 3 according to the values of the inlet water total pipe temperature transmitter TT1 and the outlet water total pipe temperature transmitter TT2. If yes, the total pipe linkage valve TCV7 is opened, and the opening degree of the cooling water inlet linkage valve TCV1 of the first compressor 3 is controlled through the cooling water outlet temperature transmitter TT6 of the first compressor 3 to control the amount of cooling water entering the first compressor 3, so as to meet the cooling demand of the first compressor 3.

[0163] If the excess cold energy of the cooling tower 11 cannot meet the cooling demand of the compressor, it is further determined whether the cooling water unit 4 is running. At the same time, the central controller determines whether the excess cold energy of the running cooling water unit 4 can meet the cooling demand of the first compressor 3 according to the value of the outlet water bypass temperature transmitter TT5. If the above conditions are met, the bypass outlet water control valve KV8 of the first compressor 3 is opened, and the opening degree of the bypass inlet water linkage valve TCV2 of the first compressor 3 is adjusted through the cooling water outlet temperature transmitter TT6 of the first compressor 3 to control the amount of cooling water entering the first compressor 3, so as to meet the cooling demand of the first compressor 3.

[0164] If the above conditions are not met, the first cooling water unit 4 is started, the cooling water unit inlet valve KV1 and the cooling water unit outlet valve KV2 of the first cooling water unit 4 are opened, and the bypass outlet water control valve KV8 of the first compressor 3 is opened. At the same time, the opening degree of the bypass inlet water linkage valve TCV2 of the first compressor 3 is adjusted through the cooling water outlet temperature transmitter TT6 of the first compressor 3 to control the amount of cooling water entering the first compressor 3, so as to meet the cooling demand of the first compressor 3.

[0165] If the first water chiller 4 fails, the second water chiller 4 is opened, the water chiller inlet valve KV3, the water chiller outlet valve KV4 of the second water chiller 4 and the bypass outlet control valve KV8 of the first compressor 3 are opened, and the opening degree of the bypass inlet linkage valve TCV2 of the first compressor 3 is regulated by the cooling water outlet temperature transmitter TT6 of the first compressor 3 to control the amount of cooling water entering the first compressor 3 to meet the cooling demand of the first compressor 3; if the second water chiller 4 fails, the third water chiller 4 is opened, the water chiller inlet valve KV5, the water chiller outlet valve KV6 of the third water chiller 4 and the bypass outlet control valve KV8 of the first compressor 3 are opened, and the opening degree of the bypass inlet linkage valve TCV2 of the first compressor 3 is regulated by the cooling water outlet temperature transmitter TT6 of the first compressor 3 to control the amount of cooling water entering the first compressor 3 to meet the cooling demand of the first compressor 3.

[0166] When the second compressor 3 and the hydrogenation machine 7 need to be started, the cold energy system operation control logic is the same as that of the first compressor 3, the excess cold energy of the cooling tower 11 is preferentially used, when the excess cold energy of the cooling tower 11 cannot meet the cooling demand, the water chiller 4 is opened to supply cooling for the system, and the three water chillers 4 adopt a linkage operation mode, not only serving as backup for each other, but also adjusting the amount of cooling water between the compressors and the hydrogenation machine 7 and the heat exchanger 71 and multiple cooling equipment through automatic control valves to distribute the cold energy, so as to improve the operation efficiency of the water chiller, increase the stability and reliability of the system operation, and reduce the low-efficiency operation time and start-stop frequency of the equipment.

[0167] The preferred embodiments of the application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor based on the concept of the application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments based on the prior art according to the concept of the application shall be within the protection scope defined by the claims.

Claims

1. A cooling system for a hydrogen production and refueling station based on multiple cooling source coupling; characterized in that: It comprises a hydrogen production device (1) and a hydrogen filling machine (7) for filling hydrogen into a filled device (6); Three or more gas storage tanks (2) are connected in series between the hydrogen production device (1) and the hydrogenation machine (7), a compressor (3) is provided between every two gas storage tanks (2), and a heat exchanger (71) of the hydrogenation machine (7) is connected in series between the last gas storage tank (2) and the hydrogenation machine (7); The cooling water circuits of all the compressors (3) and the heat exchangers (71) are connected in parallel to form a first parallel group; A water chiller (4) is provided corresponding to the heat exchanger (71) and each compressor (3), and all the water chillers (4) are connected in parallel to form a second parallel group; The cooling water pipeline (12) between the hydrogen production device (1) and the cooling tower (11) is connected to the first parallel group; The cooling water inlet of the heat exchanger (71) and each of the compressors (3) are provided with cooling water inlet linkage valves (TCV1, TCV3, TCV5), and the cooling water outlets are provided with cooling water outlet temperature transmitters (TT6, TT7, TT8) and cooling water outlet control valves (KV7, KV9, KV11) in sequence; A cooling water inlet bypass is formed between the heat exchanger (71) or each of the compressors (3) and the corresponding cooling water inlet linkage valve (TCV1, TCV3, TCV5); Each of the cooling water inlet bypasses is provided with a bypass inlet linkage valve (TCV2, TCV4, TCV6) and is connected to the inlet bypass main pipe; The water inlet bypass main pipe is provided with a water inlet bypass temperature transmitter (TT4); A cooling water outlet bypass is formed between each of the cooling water outlet temperature transmitters (TT6, TT7, TT8) and the corresponding cooling water outlet control valve (KV7, KV9, KV11) through a tee; Each of the cooling water outlet bypasses is provided with a bypass water outlet control valve (KV8, KV10, KV12) and is connected to the outlet bypass main pipe; The outlet bypass main pipe is provided with an outlet bypass temperature transmitter (TT5); The second parallel group is connected between the water inlet bypass main pipe and the water outlet bypass main pipe; The cooling water inlet of each of the chillers (4) is provided with a chiller water inlet valve (KV1, KV3, KV5), and the cooling water outlet is provided with a chiller water outlet valve (KV2, KV4, KV6).

2. The cooling system for hydrogen production and hydrogenation station based on multiple cold source coupling according to claim 1, characterized in that: The cooling water inlet and cooling water outlet of the hydrogen production device (1) and the cooling tower (11) are respectively provided with cooling water main valves (KV13, KV14, KV15, KV16); A main pipe linkage valve (TCV7) is provided on the cooling water pipe (12) at a position between two connection points connected to the water inlet and the water outlet of the first parallel group; The water inlet pipe between the first parallel group and the cooling water pipe (12) is provided with a water inlet main pipe temperature transmitter (TT1); The outlet pipe between the first parallel group and the cooling water pipe (12) is provided with an outlet water main temperature transmitter (TT2); A return water main pipe temperature transmitter (TT3) is provided on the return water pipeline between the hydrogen production device (1) and the cooling tower (11).

3. A control method, characterized in that: For the control of the cooling system of the hydrogen production and refueling station based on multi-cold source coupling as claimed in claim 2, the control process between the hydrogen production device (1) and the cooling tower (11) is as follows: Step A1, starting the hydrogen production device (1); Step A2, starting the cooling tower (11); Step A3: all cooling water main valves (KV13, KV14, KV15, KV16) of the cooling water inlet and cooling water outlet of the hydrogen production device (1) and the cooling tower (11) are opened; Step A4: Control the opening of the main pipe linkage valve (TCV7) through the outlet main pipe temperature transmitter (TT2); Step A5: determining whether the data collected by the outlet main pipe temperature transmitter (TT2) is equal to a preset value T5; If the data collected by the outlet main pipe temperature transmitter (TT2) is equal to the preset value T5, then repeat steps A3 to A5; If the data collected by the outlet main pipe temperature transmitter (TT2) is not equal to the preset value T5, step A6 is executed; Step A6: an alarm indicating that the cooling tower (11) is overloaded is issued to the user, and at the same time, the hydrogen production device (1) is shut down.

4. The control method according to claim 3, wherein The preset value T5 is 25°C±5%.

5. The control method according to claim 3, wherein: It includes two compressors (3) and three chillers (4); From the hydrogen production device (1) to the hydrogenation machine (7), all compressors (3) are numbered in sequence. Then, the chiller (4) corresponding to the compressor (3) is assigned the same number, and the largest number of the chiller (4) is increased by 1 as the number of the chiller (4) corresponding to the heat exchanger (71). When the cooling tower (11) is in the startup state, each compressor (3) is regulated according to the following steps: Step B1, starting the first compressor (3); Step B2, determining whether the cooling tower (11) is in working condition; If the cooling tower (11) is in working condition, execute step B3; If the cooling tower (11) is not in working condition, execute step B7; Step B3, determining whether the data collected by the water inlet main pipe temperature transmitter (TT1) is less than or equal to a preset value T0, and whether the data collected by the water outlet main pipe temperature transmitter (TT2) is less than or equal to a preset value T1; If the data collected by the water inlet main pipe temperature transmitter (TT1) is less than or equal to the preset value T0, and the data collected by the water outlet main pipe temperature transmitter (TT2) is less than or equal to the preset value T1, then execute step B4; If the data collected by the water inlet main pipe temperature transmitter (TT1) is greater than the preset value T0, or the data collected by the water outlet main pipe temperature transmitter (TT2) is greater than the preset value T1, then execute step B7; Step B4, opening the cooling water outlet control valve (KV7) of the first compressor (3), and using the cooling water outlet temperature transmitter (TT6) of the first compressor (3) to interlock and control the opening of the cooling water inlet linkage valve (TCV1) of the first compressor (3); Step B5, determining whether the data collected by the cooling water outlet temperature transmitter (TT6) of the first compressor (3) is less than or equal to a preset value T3; If the data collected by the cooling water outlet temperature transmitter (TT6) of the first compressor (3) is less than or equal to the preset value T3, then return to step B2; If the data collected by the cooling water outlet temperature transmitter (TT6) of the first compressor (3) is greater than the preset value T3, step B6 is executed; Step B6: issuing an alarm to the user indicating that the compressor (3) is overloaded, and simultaneously shutting down the first compressor (3), and ending all processes; Step B7, determining whether all the chillers (4) are in operation; If all the chillers (4) are in operation, execute step B8; If any of the chillers (4) is not in operation, execute step B10; Step B8, determining whether the data collected by the water inlet bypass temperature transmitter (TT4) is less than or equal to a preset value T2, and whether the data collected by the water outlet bypass temperature transmitter (TT5) is less than or equal to a preset value T4; If the data collected by the water inlet bypass temperature transmitter (TT4) is less than or equal to the preset value T2, and the data collected by the water outlet bypass temperature transmitter (TT5) is less than or equal to the preset value T4, then execute step B9; If the data collected by the water inlet bypass temperature transmitter (TT4) is greater than the preset value T2, or the data collected by the water outlet bypass temperature transmitter (TT5) is greater than the preset value T4, then step B11 is executed; Step B9, open the bypass water outlet control valve (KV8) of the first compressor (3), use the cooling water outlet temperature transmitter (TT6) of the first compressor (3) to interlock and control the opening of the bypass water inlet linkage valve (TCV2) of the first compressor (3), and then execute step B5; Step B10, starting all the chillers (4) in order of number from small to large, if the start-up is successful, opening the corresponding chiller inlet valves (KV1, KV3, KV5) and chiller outlet valves (KV2, KV4, KV6), and executing step B9; If all the water chillers (4) fail to start, an alarm indicating a failure of the water chiller (4) is issued to the user, the first compressor (3) is shut down, and all processes are terminated; Step B11, determining whether the first chiller (4) is in operation; If the first chiller (4) is in operation, execute step B12; If the first chiller (4) is not running, execute step B10; Step B12, determining whether the second chiller (4) is in operation; If the second chiller (4) is in operation, execute step B13; If the second chiller (4) is not running, execute step B14; Step B13, determining whether the third chiller (4) is in operation; If the third chiller (4) is in operation, execute step B6; If the third chiller (4) is not running, execute step B15; Step B14, starting from the second chiller (4), all the chillers (4) are started in order from the smallest to the largest according to the numbering. If the start-up is successful, the corresponding chiller inlet valves (KV3, KV5) and chiller outlet valves (KV4, KV6) are opened, and step B9 is executed; If all the water chillers (4) fail to start, an alarm indicating a failure of the water chiller (4) is issued to the user, the first compressor (3) is shut down, and all processes are terminated; Step B15, start the third chiller (4), if the start-up is successful, open the corresponding chiller inlet valve (KV5) and chiller outlet valve (KV6), and execute step B9; If the third chiller (4) fails to start, step B16 is executed to issue a chiller (4) failure alarm to the user, and the first compressor (3) is shut down, and all processes are terminated.

6. The control method according to claim 5, wherein: The preset value T0 is 10°C±5%; the preset value T1 is 30°C±5%; the preset value T2 is 15°C±5%; and the preset value T4 is 20°C±5%.

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