A method for producing oxygen for a plateau railway passenger car

Abstract

The application provides a method for generating oxygen for a plateau railway passenger car, the passenger car comprising a plurality of oxygen generation systems controlled by an oxygen generation control system, the oxygen generation system comprising an air compressor and an oxygen generator, the oxygen generation control system calculating an oxygen concentration setting value according to received data information and controlling the working mode of each oxygen generation system. The method for generating oxygen for a plateau railway passenger car provided by the application effectively reduces the carbon dioxide concentration in the car by setting an air component purification device, improves the air quality in the car, thereby reducing the demand for fresh air of the air conditioner, further reducing the demand for oxygen generation, and achieving the purpose of reducing the energy consumption of the oxygen generation system; by controlling the opening degree of the fresh air valve, the fresh air volume of the air conditioner is reduced, the demand for oxygen-enriched air is reduced, and the energy consumption of the oxygen generation system is reduced by more than 50%; and the refrigerating capacity / heat capacity of the air conditioning unit is also reduced, and the comprehensive energy-saving effect is quite remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of railway passenger cars, in particular to an oxygen production method for highland railway passenger cars. BACKGROUND

[0002] The environment of the highland subway in the west of China is poor, the altitude is high, and the oxygen concentration is thin. People from inland plains are not adapted to the local low-oxygen environment and have highland reaction. In the past, there were few railways, and people usually reached the highland area by car or plane, carrying oxygen bottles and oxygen bags to ensure their safety. With the development of the western region of the country, railways have been laid in Qingdao, Tibet and other western highland areas to realize the interconnection of railway passenger and freight trains, high-speed rail lines and inland plain areas for passenger and material transportation. Passenger trains and high-speed rails are comfortable, safe and inexpensive, and passengers can watch the scenery along the way through the windows. In addition, the altitude slowly increases during the train journey, providing passengers with a relatively adaptive process to the low-oxygen environment. In recent years, more and more people have traveled to Tibet and Qinghai, and passenger trains and high-speed rails have become the preferred means of transportation for people to enter and exit the highlands. In order to ensure the oxygen needs of the driver and crew, an oxygen production system needs to be installed in the passenger train and high-speed rail passenger car compartment and the driver's room to increase the oxygen concentration in the car and ensure the comfort of passengers in the highland state. According to the GB / T 33193.1 "Railway Vehicles Air Conditioning Part 1: Comfort Parameters" standard, the carbon dioxide concentration in the highland railway vehicle shall not exceed 0.25%. In order to ensure that the carbon dioxide concentration in the vehicle does not exceed the standard requirement, the vehicle must continuously inhale a certain amount of fresh air outside the vehicle and simultaneously expel the dirty or high carbon dioxide concentration air inside the vehicle. As the oxygen content of the inhaled fresh air outside the highland area is low, part of the oxygen supplemented by the oxygen production system in the vehicle is discharged, resulting in oxygen waste. Therefore, an oxygen production method is needed to ensure a constant oxygen concentration in the vehicle compartment. SUMMARY

[0003] The main purpose of the present application is to solve the above problems and deficiencies, and to provide an oxygen production method for highland railway passenger cars.

[0004] To achieve the above purpose, the present application provides an oxygen production system for highland railway passenger cars, the technical scheme of which is as follows:

[0005] An oxygen production method for highland railway passenger cars, the passenger car comprising a plurality of oxygen production systems controlled by an oxygen production control system, the oxygen production system comprising an air compressor and an oxygen generator, the oxygen production control system calculating the oxygen concentration set value in the vehicle according to the received data information and controlling the working mode of each oxygen production system.

[0006] Furthermore, the data information includes the atmospheric pressure value of the train's environment detected by the atmospheric pressure sensor, and the refrigeration control system calculates the oxygen concentration setpoint based on the received atmospheric pressure value and the built-in algorithm.

[0007] Furthermore, the oxygen generation control system uses the formula Cos=(23+(H-3000) / 1000)% to calculate the oxygen concentration setpoint, where Cos is the in-vehicle oxygen concentration setpoint and H is the altitude value converted from the atmospheric pressure, in meters.

[0008] Furthermore, the oxygen generation control system also includes a single-vehicle oxygen generation control device and a centralized oxygen generation control device. The single-vehicle oxygen generation control device calculates the target oxygen concentration value for each carriage based on the received atmospheric pressure value using a built-in algorithm, and transmits the calculation results to the centralized oxygen generation control device for average value calculation to obtain the oxygen concentration set value. The device then controls the working state of the oxygen generation system based on the oxygen concentration set value.

[0009] Furthermore, the oxygen generation control system controls the operating mode of the oxygen generation system based on the oxygen concentration and carbon dioxide concentration inside the vehicle.

[0010] Furthermore, the oxygen generation control system controls the operating mode of the oxygen generation system based on the real-time oxygen concentration inside the vehicle and the target oxygen concentration value, wherein...

[0011] △C O2 When A is greater than or equal to 1, the air compressor does not reduce its frequency and the fresh air valve is adjusted to decrease by 1 degree every a1 minutes.

[0012] When A1 < △C O2 When <A, the air compressor does not reduce its frequency and the fresh air valve is adjusted down by b2 degrees every a2 minutes;

[0013] When A2≤△C O2 ≤A3 and C CO2 For a value greater than X and lasting for m minutes, the air compressor does not reduce its frequency and the fresh air valve is adjusted to increase by b3 degrees every a3 minutes, where A2≤A3≤0;

[0014] When A2≤△C O2 ≤A3 and C CO2 For a value less than X and lasting for n minutes, the air compressor frequency decreases by b4 Hz every a4 minutes, and the fresh air valve is adjusted down by b5 degrees every a5 minutes, where A2≤A3≤0;

[0015] When △C O2 When the value is less than A2, the air compressor stops working;

[0016] Where △C O2 =C OS -C OA ;

[0017] △C O2 : difference between the set value of oxygen concentration in the vehicle and the real-time actual concentration, C OS : set value of oxygen concentration in the vehicle, C OA : actual oxygen concentration in the vehicle.

[0018] Further, the oxygen production control system controls the opening degree of the pre-membrane electric valve of the oxygen generator according to the real-time oxygen concentration in the vehicle, and the air compressor operates at a frequency controlled by the pre-membrane pressure value of the oxygen generator.

[0019] Further, when △C O2 ≥ A, the air compressor does not reduce the frequency, and the fresh air valve is adjusted by b1 degrees every a1 minutes.

[0020] When A1 < △C O2 < A, the air compressor does not reduce the frequency, and the fresh air valve is adjusted by b2 degrees every a2 minutes.

[0021] When A2 ≤ △C O2 ≤ A3 and C CO2 is greater than X and lasts for m1 minutes, the air compressor does not reduce the frequency, and the fresh air valve is adjusted by b3 degrees every a3 minutes, wherein A2 ≤ A3 ≤ 0.

[0022] When A2 ≤ △C O2 ≤ A3 and C CO2 is less than X and lasts for m2 minutes, the frequency of the air compressor is reduced by b4 Hz every a4 minutes, the opening degree of the pre-membrane electric valve is adjusted by z degrees every n minutes, and the fresh air valve is adjusted by b5 degrees every a5 minutes, wherein A2 ≤ A3 ≤ 0.

[0023] Further, after the opening degree of the pre-membrane electric valve is adjusted, the pre-membrane pressure Pf changes, and the air compressor automatically adjusts the operating frequency according to the change of the pre-membrane pressure, specifically:

[0024] Within T1 time, if p1 < △P < p2, the operating frequency of the air compressor does not change.

[0025] Within T1 time, if p2 < △P < p3, the operating frequency of the air compressor is reduced by h1.

[0026] Within T1 time, if p3 < △P < p4, the operating frequency of the air compressor is reduced by h2.

[0027] Within T1 time, if p4 < △P < p5, the operating frequency of the air compressor is reduced by h3.

[0028] Within T1 time, if p6 < △P < p7, the operating frequency of the air compressor is reduced by h4.

[0029] And so on.

[0030] If P2<△P<P1, the running frequency of the air compressor is increased by H1 in T2 time;

[0031] If P3<△P<P2, the running frequency of the air compressor is increased by H2 in T2 time;

[0032] If P4<△P<P3, the running frequency of the air compressor is increased by H3 in T2 time;

[0033] If P5<△P<P4, the running frequency of the air compressor is increased by H4 in T2 time;

[0034] And so on;

[0035] Wherein, △P=Pf-Ps, Pf is the actual membrane front pressure, Ps is the pressure setting value, p1 to p7 are constants, p1 is a negative number, p2 is a positive number, unit MPa, P1 to P5 are negative numbers, unit MPa, h1 to h4, H1 to H4 are constants in order to increase, unit Hz.

[0036] Further, the air purification device is arranged in each compartment, the air purification device continuously operates after the oxygen generating system is started, and the air purification device automatically stops after the oxygen generating system is stopped.

[0037] In summary, the oxygen generating method for the plateau railway passenger car has the following advantages compared with the prior art:

[0038] 1. The air composition purification device is arranged, so that the carbon dioxide concentration in the car is effectively reduced, the demand for fresh air of the air conditioner is reduced, the demand for oxygen generating amount is reduced, and the purpose of reducing the energy consumption of the oxygen generating system is achieved.

[0039] 2. The air purification device improves the oxygen concentration in the car compartment and reduces harmful gases such as formaldehyde and TVOC.

[0040] 3. The total power consumption of the oxygen generating system of each train (15 passenger cars) of the Qinghai-Tibet passenger car is about 600kW or more, and the average power of each car is about 40kW. By increasing the air purification device, absorbing the carbon dioxide in the car, controlling the opening degree of the fresh air valve, reducing the fresh air volume of the air conditioner, realizing the reduction of the demand for oxygen-enriched air, and reducing the energy consumption of the oxygen generating system by more than 50%, the energy consumption of the oxygen generating system is reduced by more than 50%.

[0041] 4. By reducing the fresh air volume, the refrigerating capacity / heat capacity of the air conditioning unit is also reduced, and the comprehensive energy saving effect is quite remarkable.

[0042] 5. It has the characteristics of reliability, energy saving, convenience for installation and the like;

[0043] 6. According to the calculation, the air conditioning fresh air of the oxygen generating system can be reduced by 4m 3 / h or less by adding the gas purification device.

[0044] 7. It is divided into whole vehicle control and single vehicle control. The control method can be flexibly set according to environmental needs, saving energy. Attached image description:

[0045] Figure 1 This invention provides a schematic diagram of oxygen production control in an oxygen production method for passenger cars on high-altitude railways.

[0046] Figure 2 This invention provides a schematic diagram of a centralized control mode structure in an oxygen production method for passenger cars on plateau railways.

[0047] Among them, oxygen generator 1, air compressor 2, carbon dioxide concentration sensor 3, oxygen concentration sensor 4, fresh air valve 5, single-vehicle oxygen generation control device 6, air purification device 7, membrane pressure sensor 8, centralized oxygen generation control device 9, train network 10, atmospheric pressure sensor 11, and electric valve 12. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0049] This invention provides an oxygen generation method for high-altitude railway passenger cars. The passenger car includes multiple oxygen generation systems centrally controlled by an oxygen generation control system. Each oxygen generation system includes an air compressor and an oxygen generator. The oxygen generation control system calculates the set value of the oxygen concentration inside the car based on the received data information and controls the working mode of each oxygen generation system.

[0050] like Figure 1 As shown, the oxygen generation system for passenger cars on plateau railways is equipped with one set of oxygen generation systems in each carriage. Each set of oxygen generation systems includes one or more oxygen generators 1, air compressors 2 and air conditioning units. Each carriage is equipped with a single-car oxygen generation control device 6, which is electrically or signal-connected to the oxygen generation system of this carriage, thereby controlling its working status and working mode.

[0051] Taking a passenger railcar as an example, this section introduces the specific composition of the oxygen generation system. The driver's cab of a freight train can be adapted and modified based on the passenger train's system. Air compressor 2 compresses fresh air drawn from outside the train into high-pressure gas under rated pressure conditions. This compressed high-pressure air is then supplied to each oxygen generator 1 via compressed air pipelines to produce oxygen-enriched air. Air compressor 2 is equipped with an intelligent cooling system that cools the compressed air to a set temperature before outputting it, effectively reducing the cooling capacity of the air conditioning unit. Simultaneously, the single-vehicle oxygen generation control device 6 integrates a frequency converter, which controls the speed of air compressor 2, reducing its energy consumption. Alternatively, a permanent magnet variable frequency air compressor can be used, which has higher efficiency than traditional air compressors, thus further reducing the power consumption of the oxygen generation system.

[0052] The oxygen-enriched air produced by each oxygen generator 1 is released into the vehicle cabin through the oxygen-enriched pipeline, or the oxygen generator 1 is connected to an oxygen-enriched storage tank, and the generated oxygen-enriched air is stored in the storage tank. When needed, the oxygen-enriched air is delivered to the vehicle cabin through the oxygen-enriched pipeline 12 under the control of the single-vehicle oxygen generation control device 6, so as to adjust the oxygen concentration in the vehicle cabin and ensure the oxygen demand of passengers. At the same time, the oxygen-enriched air can also be prepared in advance in a high-oxygen environment in a plain area without oxygen demand, so as to effectively reduce the working load of the oxygen generator 1 in the plateau area. In the embodiment, the oxygen generator 1 is a membrane separation oxygen generator. The high-pressure air generated by the air compressor 2 is separated by the membrane separation principle, and the oxygen-enriched gas is discharged at the low-pressure permeation side (the side of the membrane) of the membrane. The exhaust gas (waste gas, mainly nitrogen) is discharged at the other side (the part that does not permeate) of the membrane assembly. Therefore, the two sides of the membrane of the oxygen generator 1 are respectively connected to the oxygen-enriched pipeline and the exhaust pipeline. The oxygen-enriched pipeline delivers the oxygen-enriched air generated by the oxygen generator to the vehicle cabin. The exhaust pipeline discharges the waste exhaust gas generated in the oxygen generation process outside the vehicle. In the embodiment, an oxygen separation membrane that can work at low pressure is selected. The membrane can generate oxygen-enriched air with a concentration of 40% at a working pressure of 5 Bar to 8 Bar, and the air consumption does not increase. Therefore, the amount of compressed air required by the oxygen generator 1 does not change, but the pressure is significantly reduced, thereby reducing the power of the air compressor 2 and the energy consumption of the entire oxygen generation system.

[0053] In order to protect the membrane of the oxygen generator 1 and prevent the membrane from being damaged by the high pressure of the compressed air, a membrane front pressure sensor 8 is arranged at the front end (the end connected to the compressed air pipeline) of the oxygen generator 1. The operating frequency of the air compressor 2 is adjusted according to the pressure of the membrane front pressure sensor 8, so as to deliver compressed air with a rated pressure to the oxygen generator 1. A flow valve is arranged at the output end (the end connected to the oxygen-enriched pipeline) of the oxygen generator 1. The opening degree of the flow valve can be controlled, so as to control the oxygen concentration in the vehicle cabin.

[0054] In the embodiment provided by the application, the oxygen production control system comprises a centralized oxygen production control device 9 and a single-car oxygen production control device 6. The centralized oxygen production control device 9 can be a separate control module or integrated in the passenger car control system. The centralized oxygen production control device 9 communicates with the single-car oxygen production control device 6 through the train network 10, has the functions of controlling and monitoring the state of the single-car oxygen production control device 6, and controls the working state and mode of all oxygen production systems in the train. Therefore, in the embodiment, the oxygen production control system divides the whole oxygen production control into two modes of “centralized control” and “single-car control”. In the normal state, the centralized control mode (hereinafter referred to as the centralized control mode) is implemented, the oxygen concentration in each car of the train is set by the centralized oxygen production control device 9, and the working mode and state of each oxygen production system are controlled, that is, the working state of each oxygen generator 1 and air compressor is controlled, and the start-stop sequence, running quantity and sequence, and running frequency of each air compressor are controlled. In this way, energy can be saved better, and the time length of putting each device into the working state is basically the same, thereby prolonging the service life of each device. The single-car oxygen production control device 6 set in each car receives the control information sent by the centralized oxygen production control system through the train network, and collects the data information required in the oxygen production control process. According to the information content, the single-car oxygen production control device 6 processes the related data according to the built-in pre-stored algorithm, or transmits the collected data information and the processed data to the centralized oxygen production control system 9 through the train network. After calculation by the built-in algorithm, the control instruction is output, and the oxygen production control of the whole train and the oxygen concentration control of each car are realized. The centralized control mode and the single-car control mode can be freely switched. The switching mode can be controlled by a predetermined program. The centralized control mode can be released or started by the centralized oxygen production control device 9 according to the predetermined program. In the centralized control mode, the control mode can be adjusted on each single-car oxygen production control device 6 to implement the single-car control mode of the car. The centralized control mode and the single-car control mode can be set according to the predetermined program, which is not the focus of the application of the embodiment, and is not limited.

[0055] Since the passenger car mainly runs in the plateau area, the atmospheric pressure is different at different altitudes. With the increase of altitude, the oxygen content in the external environment decreases. After the external air is introduced by the fresh air valve 5, the oxygen concentration of the air in the car also decreases. The oxygen production system further comprises an atmospheric pressure sensor 11. The atmospheric pressure sensor 11 can detect the atmospheric pressure of the external environment in real time. The oxygen production control system has a built-in table of set oxygen concentration values in the car corresponding to different atmospheric pressure / altitude intervals, as shown in Table 1.

[0056] Table 1 Set oxygen concentration in the car at different altitudes

[0057] Altitude In-vehicle oxygen concentration set value 2500～3000 23％ 3000～3500 23.5％ 3500～4000 24％ 4000～4500 24.5％ 4500～5000 25％

[0058] The higher the altitude, the lower the atmospheric pressure, and the higher the oxygen concentration set in the vehicle. The oxygen production control system is electrically or signal connected with the atmospheric pressure sensor 11, receives the data of the atmospheric pressure sensor in real time or at a fixed time, and sets the target value of the oxygen concentration in the vehicle cabin according to the built-in program and the real-time value of the atmospheric pressure sensor 11 according to Table 1, controls the working state of the oxygen production system, and adjusts the oxygen concentration in the vehicle cabin.

[0059] To realize fine control of the oxygen concentration in the vehicle, in the centralized control mode, the atmospheric pressure sensor 11 detects the atmospheric pressure of the passenger car in real time and transmits it to the single-car oxygen production control device 6, which converts the received atmospheric pressure value into an altitude and calculates the oxygen concentration set value in the vehicle according to Formula 1, and uploads the calculation result to the centralized oxygen production control system 9.

[0060] Formula 1: C OS = (23 + (H-3000) / 1000)%

[0061] Note: C OS - target value of oxygen concentration in the vehicle;

[0062] H- altitude, unit m.

[0063] The number of atmospheric pressure sensors 11 can be determined according to the topography of the operating area. In high-altitude areas where the altitude changes smoothly, only one atmospheric pressure sensor 11 can be set, or a backup atmospheric pressure sensor 11 can be set in the conventional way. The atmospheric pressure sensor 11 is connected to the adjacent single-car oxygen production control device 6, which calculates and uploads the calculation result to the centralized oxygen production control system 9 according to the above method. Alternatively, several carriages can share one atmospheric pressure sensor 11, or as shown in the present embodiment, each carriage is provided with an atmospheric pressure sensor 11 connected to the single-car oxygen production control device 6 of the present carriage, and each single-car oxygen production control device 6 calculates the target oxygen concentration set value in the vehicle. In the centralized control mode, the single-car oxygen production control device 6 uploads the calculation result to the centralized oxygen production control device 9, which processes the collected target oxygen concentration set values, removes the maximum and minimum values that have the greatest impact on data processing, and calculates the average value of the remaining data, which is used as the control target value of the oxygen concentration in each carriage. In the single-car control mode, the oxygen concentration set value in each carriage is automatically set by the single-car oxygen production control device 6 according to the calculation result based on the altitude value of the present vehicle.

[0064] The centralized oxygen production control device 9 and / or the single-car oxygen production control device 6 can implement energy-saving control on the oxygen production machine 1 and the air compressor 2 to adjust the oxygen concentration in the car to the oxygen concentration set value calculated according to the atmospheric pressure value in the foregoing. Specifically:

[0065] The control method 1 is based on the real-time oxygen concentration and carbon dioxide concentration in the car:

[0066] When △C O2 ≥ A, the air compressor does not work at a reduced frequency, the fresh air valve is adjusted by b1 degrees every a1 minutes, the working state of the air compressor 2 and the oxygen production machine 1 is maintained, the oxygen-enriched air is quantitatively input into the car, the import of the outdoor low-oxygen-content fresh air is reduced, and the oxygen concentration in the car is increased. For example, when △C O2 ≥ 1%, the air compressor does not work at a reduced frequency, the fresh air valve is adjusted by b1 degrees every a1 minutes, for example, it can be set to be adjusted by 5 degrees every 3 minutes;

[0067] When A1 < △C O2 < A, the air compressor does not work at a reduced frequency, the fresh air valve is adjusted by b2 degrees every a2 minutes, the working state of the air compressor 2 and the oxygen production machine 1 is maintained, the oxygen-enriched air is quantitatively input into the car, the import of the outdoor low-oxygen-content fresh air is reduced, and the oxygen concentration in the car is increased. For example, when 0.5% < △C O2 < 1%, the air compressor does not work at a reduced frequency, and is adjusted by 3 degrees every 3 minutes;

[0068] When A2 ≤ △C O2 ≤ A3 and C CO2 is greater than X and lasts for m minutes, the air compressor does not work at a reduced frequency, the fresh air valve is adjusted by b3 degrees every a3 minutes, A2 ≤ A3 ≤ 0, the working state of the air compressor 2 and the oxygen production machine 1 is maintained, the oxygen-enriched air is quantitatively input into the car, and the import of the outdoor low-oxygen-content fresh air is increased to increase the oxygen concentration in the car. For example, when -0.5% ≤ △C O2 ≤ 0 and C CO2 is greater than 0.3% and lasts for 3 minutes, the air compressor does not work at a reduced frequency, and the fresh air valve is adjusted by 1 degree every 3 minutes;

[0069] When A2 ≤ △C O2 ≤ A3 and C CO2 is less than X and lasts for n minutes, the frequency of the air compressor is reduced by b4 Hz every a4 minutes, and the fresh air valve is adjusted by b5 degrees every a5 minutes, A2 ≤ A3 ≤ 0, the working state of the air compressor 2 and the oxygen production machine 1 is reduced, the amount of oxygen-enriched air input into the car is reduced, and the import of the outdoor low-oxygen-content fresh air is reduced to increase the oxygen concentration in the car. For example, when -0.5% ≤ △C O2 ≤ 0 and C CO2 is less than 0.25% and lasts for 3 minutes, the frequency of the air compressor is reduced by 5 Hz every 3 minutes, and the fresh air valve is adjusted by 1 degree every 3 minutes;

[0070] When △C O2 When A2≤△C O2 When △C

[0071] When △C O2 = C OS - C OA ;

[0072] △C O2 : the difference between the set value and the actual value of the oxygen concentration in the vehicle;

[0073] C OS : the set value of the oxygen concentration in the vehicle;

[0074] C OA : the actual oxygen concentration in the vehicle;

[0075] C CO2 : the carbon dioxide concentration in the vehicle.

[0076] Control method 2, based on the oxygen concentration, carbon dioxide concentration and the pressure before the membrane, in this method, the opening of the electric valve 12 before the membrane is automatically controlled by the oxygen production control system according to the oxygen concentration in the vehicle, the pressure value of the pressure sensor 8 before the membrane is fed back to the oxygen production system, and the running frequency of the air compressor 2 is controlled. Specifically:

[0077] When △C O2 ≥ A, the air compressor does not work at a reduced frequency, the fresh air valve is adjusted by b1 degrees every a1 minutes, the working state of the air compressor 2 and the oxygen generator 1 is maintained, the oxygen-enriched air is quantitatively input into the vehicle, the introduction of outdoor fresh air with low oxygen content is reduced, and the oxygen concentration in the vehicle is improved, and when △C O2 ≥ 1%, the air compressor does not work at a reduced frequency, and the fresh air valve is adjusted by b1 degrees every a1 minutes, and can be set to be adjusted by 5 degrees every 3 minutes;

[0078] When A1<△C O2 <A, the air compressor does not work at a reduced frequency, the fresh air valve is adjusted by b2 degrees every a2 minutes, the working state of the air compressor 2 and the oxygen generator 1 is maintained, the oxygen-enriched air is quantitatively input into the vehicle, the introduction of outdoor fresh air with low oxygen content is reduced, and the oxygen concentration in the vehicle is improved, and when 0.5%<△C O2 <1%, the air compressor does not work at a reduced frequency, and is adjusted by 3 degrees every 3 minutes;

[0079] When A2≤△C O2 ≤ A3 and C CO2greater than X and lasting m1 minutes, the air compressor works without frequency reduction, the fresh air valve is adjusted by b3 degrees every a3 minutes, wherein A2≤A3≤0, the working state of the air compressor 2 and the oxygen generator 1 is maintained, the oxygen-enriched air is quantitatively input into the vehicle, and the outdoor low-oxygen-content fresh air is introduced to improve the oxygen concentration in the vehicle. When -0.5%≤△C O2 ≤0 and C CO2 greater than 0.3% and lasting 3 minutes, the air compressor works without frequency reduction, the fresh air valve is adjusted by 1 degree every 3 minutes;

[0080] When A2≤△C O2 ≤A3 and C CO2 less than X and lasting m2 minutes, the air compressor frequency is reduced by b4 Hz every a4 minutes, the opening of the pre-membrane electric valve 12 is adjusted by z degrees every n minutes, and the fresh air valve is adjusted by b5 degrees every a5 minutes, wherein A2≤A3≤0, the working frequency of the air compressor 2 and the opening of the pre-membrane electric valve 12 are reduced, the amount of oxygen-enriched air input into the vehicle is reduced, the outdoor low-oxygen-content fresh air is introduced to improve the oxygen concentration in the vehicle. When -0.5%≤△C O2 ≤0 and C CO2 less than 0.25% and lasting 3 minutes, the air compressor frequency is reduced by 5 Hz every 3 minutes, and the fresh air valve is adjusted by 1 degree every 3 minutes.

[0081] After the opening of the pre-membrane electric valve 12 is adjusted, the pre-membrane pressure (Pf) changes, the air compressor 2 automatically adjusts the working frequency according to the pre-membrane pressure to ensure that the pre-membrane pressure is maintained in a predetermined range, such as 0.8±0.05 MPa. Specifically as follows:

[0082] In T1 time, if p1<△P<p2, the running frequency of the air compressor is unchanged;

[0083] In T1 time, if p2<△P<p3, the running frequency of the air compressor is reduced by h1;

[0084] In T1 time, if p3<△P<p4, the running frequency of the air compressor is reduced by h2;

[0085] In T1 time, if p4<△P<p5, the running frequency of the air compressor is reduced by h3;

[0086] In T1 time, if p6<△P<p7, the running frequency of the air compressor is reduced by h4;

[0087] and so on…

[0088] In T2 time, if P2<△P<P1, the running frequency of the air compressor is increased by H1;

[0089] In T2 time, if P3<△P<P2, the running frequency of the air compressor is increased by H2;

[0090] If P4 < ΔP < P3, the frequency of the air compressor is increased by H3 in T2;

[0091] If P5 < ΔP < P4, the frequency of the air compressor is increased by H4 in T2;

[0092] And so on…

[0093] Specifically:

[0094] If -0.01 MPa < ΔP < 0.01 MPa, the frequency of the air compressor is unchanged in 30 seconds;

[0095] If 0.01 MPa < ΔP < 0.02 MPa, the frequency of the air compressor is decreased by 2 Hz in 30 seconds;

[0096] If 0.02 MPa < ΔP < 0.03 MPa, the frequency of the air compressor is decreased by 3 Hz in 30 seconds;

[0097] If 0.03 MPa < ΔP < 0.04 MPa, the frequency of the air compressor is decreased by 4 Hz in 30 seconds;

[0098] If 0.04 MPa < ΔP < 0.05 MPa, the frequency of the air compressor is decreased by 5 Hz in 30 seconds;

[0099] And so on…

[0100] If -0.02 MPa < ΔP < -0.01 MPa, the frequency of the air compressor is increased by 2 Hz in 30 seconds;

[0101] If -0.03 MPa < ΔP < -0.02 MPa, the frequency of the air compressor is increased by 3 Hz in 30 seconds;

[0102] If -0.04 MPa < ΔP < -0.03 MPa, the frequency of the air compressor is increased by 4 Hz in 30 seconds;

[0103] If -0.05 MPa < ΔP < -0.04 MPa, the frequency of the air compressor is increased by 5 Hz in 30 seconds;

[0104] And so on…

[0105] Wherein: ΔP = Pf - Ps, Pf is the actual pre-membrane pressure, and Ps is the pressure set value.

[0106] In the embodiment, two energy-saving control methods of oxygen concentration in the vehicle are provided. In actual application, one of the two methods can be selected according to actual conditions, or the two methods can be combined for use by setting a program.

[0107] When the energy-saving control is performed, the target value of oxygen concentration in each vehicle compartment is automatically set according to the atmospheric pressure value, and remains unchanged for a certain time, such as 20 minutes, to avoid frequent adjustment and energy consumption.

[0108] Further, in each vehicle compartment, one or more air purification devices 7 are arranged. The air purification device 7 can be arranged in the indoor air path of the air conditioning unit to purify the air in the vehicle compartment at any time, or can be arranged separately at a position in the vehicle compartment that does not affect the appearance and space use of the vehicle. The working state of the air purification device 7 is controlled by the oxygen generation control system. The air purification device 7 adopts the principle of cyclic adsorption and separation, and can adsorb carbon dioxide, TVOC, formaldehyde and other “harmful” gases in the vehicle, and then discharge them outside the vehicle. The air purification device 7 includes a purification device main body, an air inlet path, an air return path and an air exhaust path. The purification device main body is made of a composite material with adsorption properties such as activated carbon, which can adsorb carbon dioxide, formaldehyde, TVOC and other gases. The air in the vehicle compartment enters the purification device main body through the air return path, is adsorbed and purified by the purification device main body, and then the air after the concentration of carbon dioxide and other “harmful gases” is reduced is returned to the vehicle compartment through the air inlet path, thereby reducing the concentration of carbon dioxide in the vehicle and improving the quality and oxygen content of the air in the vehicle. The purification device main body can restore the purification capacity by high temperature or reverse discharge. In the high temperature or reverse blowing condition, the carbon dioxide, formaldehyde and other gases in the adsorption material are released, and the waste gas generated in the process of restoring the purification capacity is discharged outside the vehicle through the air exhaust path, so that the purification device main body restores the adsorption capacity. The restoration of the purification device main body can use any technology in the prior art, which is not limited. When the purification capacity is restored, the air return path and the air inlet path are closed to prevent the released carbon dioxide, formaldehyde and other gases from returning to the vehicle compartment.

[0109] When the passenger vehicle enters the plateau area, the oxygen generation system starts to generate oxygen and provide oxygen-rich air to the vehicle, and the air purification device 7 is started and continuously operated at the same time. After the oxygen generation system is stopped, the air purification device 7 is automatically stopped. Or the single-vehicle oxygen generation control device 6 can store a predetermined value interval of different oxygen concentrations. The average value obtained by calculation is compared with the predetermined value interval, and the working state of the air purification device 7 and the oxygen generator 1 is determined in combination with the oxygen generation energy-saving control method described above.

[0110] When the oxygen concentration measured value (the average value of oxygen concentration in each carriage, the same below) received by the oxygen production control system is less than the first limit value, the oxygen concentration in the carriage is relatively high at this time, the amount of oxygen to be supplemented is not large, and the air purification device 7 is controlled to work alone, the carbon dioxide concentration in the air in the carriage is filtered, so that the oxygen concentration in the carriage is indirectly increased, and the oxygen generator 1 does not need to be started, thereby reducing the use rate and energy consumption of the oxygen generator 1; when the measured value is greater than the first limit value and less than the second limit value, at this time, the oxygen concentration increased by the air purification device 7 cannot meet the oxygen demand in the carriage, at this time, the operation of the air purification device 7 is stopped, and the oxygen generator 1 is controlled to work according to the method described above to supplement the oxygen-rich air in the carriage and increase the oxygen content in the carriage; when the measured value is greater than the third limit value, the air purification device 7 and the oxygen generator 1 can be controlled to work at the same time to supplement the oxygen-rich air in the carriage; in actual application, the working state of the air purification device 7 and the oxygen generator 1 can be controlled according to the above scheme, or the oxygen generator 1 can be directly controlled to work when the oxygen concentration is low, and the air purification device 7 can be always in working state to improve the air quality in the carriage.

[0111] In summary, the oxygen production method for highland railway passenger cars provided by the application has the following advantages compared with the prior art:

[0112] 1. The air composition purification device is arranged to effectively reduce the carbon dioxide concentration in the car, thereby reducing the demand for new air of the air conditioner, further reducing the demand for oxygen production, and achieving the purpose of reducing the energy consumption of the oxygen production system;

[0113] 2. The air purification device increases the oxygen concentration in the carriage while reducing harmful gases such as formaldehyde and TVOC;

[0114] 3. The total power consumption of the oxygen production system of each train (15 passenger cars) of the Qinghai-Tibet passenger car is about 600kW or more, and the average power of each car is about 40kW, by increasing the air purification device, absorbing the carbon dioxide in the car, controlling the opening degree of the fresh air valve, reducing the air conditioning fresh air volume, realizing the reduction of the demand for oxygen-rich air, and reducing the energy consumption of the oxygen production system by more than 50%;

[0115] 4. By reducing the fresh air volume, the refrigerating / heating capacity of the air conditioning unit is also reduced, and the comprehensive energy saving effect is quite remarkable.

[0116] 5. It has the characteristics of reliability, energy saving, convenience for installation and the like;

[0117] 6. According to the calculation, the air conditioning fresh air can be reduced by 4m3 / h or less by adding the gas purification device.

[0118] As described above, in combination with the given solution content, similar technical solutions can be derived. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, as long as it does not deviate from the content of the technical solutions of the present application, still belongs to the scope of the technical solutions of the present application.

Claims

1. A method for generating oxygen for passenger cars on high-altitude railways, characterized in that: The passenger car includes multiple oxygen production systems centrally controlled by an oxygen production control system and an atmospheric pressure sensor. The oxygen production system includes an air compressor and an oxygen generator, and the atmospheric pressure sensor detects the atmospheric pressure value of the environment in which the train is located. Each carriage is equipped with one or more air purification devices, whose working status is controlled by the oxygen generation control system. When the bus enters a high-altitude area, the air purification devices are turned on and run continuously while the oxygen generation system starts producing oxygen. When the oxygen generation system stops, the air purification devices automatically stop. When the measured oxygen concentration received by the oxygen generation control system is less than the first limit, the air purification device is turned on separately to indirectly increase the oxygen concentration in the cabin by filtering the carbon dioxide concentration in the air inside the cabin. When the measured oxygen concentration is greater than the first limit and less than the second limit, the operation of the air purification device is stopped. The oxygen generation control system calculates the target oxygen concentration value based on the atmospheric pressure value of the train environment and the built-in algorithm using the formula Cos=(23+(H-3000) / 1000)%, where Cos is the set value of the oxygen concentration in the car and H is the altitude value converted from the atmospheric pressure in meters. The system also controls the working mode of each oxygen generation system and implements energy-saving control for the oxygen generator and air compressor to adjust the oxygen concentration in the car to reach the target oxygen concentration value. When the measured oxygen concentration exceeds the third limit, the air purification device and oxygen generator will work simultaneously to effectively replenish the cabin with oxygen-enriched air.

2. The oxygen generation method for high-altitude railway passenger cars as described in claim 1, characterized in that: The oxygen generation control system also includes a single-vehicle oxygen generation control device and a centralized oxygen generation control device. The single-vehicle oxygen generation control device calculates the target oxygen concentration value for each carriage based on the received atmospheric pressure value using a built-in algorithm, and transmits the calculation results to the centralized oxygen generation control device for average value calculation to obtain the oxygen concentration set value. The device then controls the working state of the oxygen generation system based on the oxygen concentration set value.

3. The oxygen generation method for high-altitude railway passenger cars as described in claim 1, characterized in that: The oxygen generation control system controls the operating mode of the oxygen generation system based on the oxygen concentration and carbon dioxide concentration inside the vehicle.

4. The oxygen generation method for high-altitude railway passenger cars as described in claim 3, characterized in that: The oxygen generation control system controls the operating mode of the oxygen generation system based on the real-time oxygen concentration inside the vehicle and the target oxygen concentration value. △C O2 When A is greater than or equal to 1, the air compressor does not reduce its frequency and the fresh air valve is adjusted to decrease by 1 degree every a1 minutes. When A1 < △C O2 When <A, the air compressor does not reduce its frequency and the fresh air valve is adjusted down by b2 degrees every a2 minutes; When A2≤△C O2 ≤A3 and C CO2 If the value is greater than X and lasts for m minutes, the air compressor does not reduce its frequency and the fresh air valve is adjusted to increase by b3 degrees every a3 minutes, where A2≤A3≤0; When A2≤△C O2 ≤A3 and C CO2 For a value less than X and lasting for n minutes, the air compressor frequency decreases by b4 Hz every a4 minutes, and the fresh air valve is adjusted down by b5 degrees every a5 minutes, where A2≤A3≤0; When △C O2 When the value is less than A2, the air compressor stops working; Where △C O2 =C OS -C OA ; △C O2 The difference between the setpoint for the oxygen concentration inside the vehicle and the actual real-time concentration; C OS : In-vehicle oxygen concentration setpoint; C OA Actual oxygen concentration inside the vehicle; Cc O2 Carbon dioxide concentration inside the vehicle; a1 to a3 and a5 are △C O2 The time interval between each adjustment of the fresh air valve's opening degree in different zones; a4, the time interval between each reduction in the air compressor frequency; b1 to b3 and b5 are △C O2 The opening degree of the fresh air valve is adjusted each time in different zones; b4, the reduction value each time the air compressor frequency is reduced; m1 and m2 are △C O2 The duration of carbon dioxide concentration at the set limit in different ranges; X, A2≤△C O2 The carbon dioxide concentration limit when ≤A3; A, A1, A2, A3 are different limits for the difference between the set value of oxygen concentration inside the vehicle and the actual real-time concentration, where A1 < A and A2 ≤ A3 ≤ 0.

5. The oxygen generation method for high-altitude railway passenger cars as described in claim 1, characterized in that: The oxygen generation control system controls the opening degree of the electric valve in front of the oxygen generator according to the real-time oxygen concentration in the vehicle, and the oxygen generation system controls the operating frequency of the air compressor according to the pressure value in front of the oxygen generator membrane.

6. The oxygen generation method for high-altitude railway passenger cars as described in claim 5, characterized in that: When △C O2 When A is greater than or equal to 1, the air compressor does not reduce its frequency and the fresh air valve is adjusted to decrease by 1 degree every a1 minutes. When A1 < △C O2 When <A, the air compressor does not reduce its frequency and the fresh air valve is adjusted down by b2 degrees every a2 minutes; When A2≤△C O2 ≤A3 and C CO2 If the value is greater than X and lasts for m1 minutes, the air compressor does not reduce its frequency and the fresh air valve is adjusted to increase by b3 degrees every a3 minutes, where A2≤A3≤0; When A2≤△C O2 ≤A3 and C CO2 For a period of m2 minutes and less than X, the air compressor frequency decreases by b4 Hz every a4 minutes, the opening of the pre-diaphragm electric valve decreases by z degrees every n minutes, and the fresh air valve decreases by b5 degrees every a5 minutes, where A2≤A3≤0; in, △C O2 The difference between the setpoint for the oxygen concentration inside the vehicle and the actual real-time concentration; Cc O2 Carbon dioxide concentration inside the vehicle; a1 to a3 and a5 are △C O2 The time interval between each adjustment of the fresh air valve's opening degree in different zones; a4, the time interval between each reduction in the air compressor frequency; b1 to b3 and b5 are △C O2 The opening degree of the fresh air valve is adjusted each time in different zones; b4, the reduction value each time the air compressor frequency is reduced; m1 and m2 are △C O2 The duration of carbon dioxide concentration at set limits in different ranges; A1, A2, and A3 are different limits for the difference between the setpoint and the real-time actual oxygen concentration inside the vehicle, where A1 < A and A2 ≤ A3 ≤ 0. X, A2≤△C O2 The carbon dioxide concentration limit when ≤A3; z, the angle that the electric opening of the membrane front is adjusted each time; n is the time interval between each adjustment of the opening degree of the pre-diaphragm electric valve.

7. The oxygen generation method for high-altitude railway passenger cars as described in claim 6, characterized in that: After the opening degree of the pre-membrane electric valve is adjusted, the pre-membrane pressure Pf changes. The air compressor automatically adjusts its operating frequency according to the change in pre-membrane pressure. Specifically... If p1 < ΔP < p2 within time T1, then the operating frequency of the entire air compressor remains unchanged. If p2 < ΔP < p3 within time T1, then the operating frequency of the entire air compressor will decrease by h1. If p3 < ΔP < p4 within time T1, then the operating frequency of the entire air compressor will decrease by h2. If p4 < △P < p5 within time T1, then the operating frequency of the entire air compressor will decrease by h3. If p6 < △P < p7 within time T1, then the operating frequency of the entire air compressor will decrease by h4. And so on; If P2 < ΔP < P1 within time T2, then the operating frequency of the entire air compressor unit will increase by H1. If P3 < ΔP < P2 within time T2, then the operating frequency of the entire air compressor unit will increase by H2. If P4 < △P < P3 within time T2, then the operating frequency of the entire air compressor unit will increase by H3. If P5 < △P < P4 within time T2, then the operating frequency of the entire air compressor unit will increase by H4. And so on; Where △P=Pf-Ps, Pf is the actual membrane inlet pressure, Ps is the pressure setpoint, p1 to p7 are constants, p1 is negative, p2 is positive, in MPa, P1 to P5 are negative, in MPa, h1 to h4 and H1 to H4 are constants that increase sequentially, in Hz.

8. A method for generating oxygen for high-altitude railway passenger cars as described in any one of claims 1 to 7, characterized in that: Each carriage is equipped with an air purification device. The air purification device runs continuously after the oxygen generation system is turned on, and automatically shuts down after the oxygen generation system is turned off.

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