Preparation system and method of high-pressure large-flow oil-free stable compressed air

Abstract

The invention provides a preparation system and method for high-pressure large-flow oil-free stable compressed air, and the preparation system comprises a first compression device which is used for compressing sucked air to obtain first compressed air; the first buffer device is used for buffering the first compressed air; the second compression device is used for compressing the buffered first compressed air to obtain second compressed air, and the air pressure of the second compressed air is higher than that of the first compressed air; the adsorption purification device is used for adsorbing and purifying the second compressed air; and the second buffer device is used for buffering the second compressed air subjected to adsorption purification. Compressed air meeting rocket launching task requirements is prepared through the preparation system.

Description

Technical Field

[0001] This invention relates to the field of compressed air preparation technology, specifically to a system and method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air. Background Technology

[0002] Commercial space launch sites need to meet the high-pressure air supply requirements and gas standards of rockets when carrying out rocket launch missions. Therefore, there is an urgent need for a way to prepare compressed air that meets the requirements of rocket launch missions. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a system and method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air to prepare compressed air that meets the requirements of rocket launch missions.

[0004] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] The first aspect of this invention discloses a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system, the preparation system comprising at least: a first compression device, a first buffer device, a second compression device, an adsorption purification device, and a second buffer device;

[0006] The first compression device is used to compress the intake air to obtain first compressed air;

[0007] The first buffer device is used to buffer the first compressed air;

[0008] The second compression device is used to compress the buffered first compressed air to obtain a second compressed air, wherein the pressure of the second compressed air is higher than that of the first compressed air.

[0009] The adsorption purification device is used to adsorb and purify the second compressed air;

[0010] The second buffer device is used to buffer the second compressed air after it has been adsorbed and purified.

[0011] Preferably, the preparation system further includes: a control system;

[0012] The control system is used to control the operation of the first compression device, the first buffer device, the second compression device, the adsorption purification device, and the second buffer device.

[0013] Preferably, the preparation system further includes: an equipment cooling device;

[0014] The equipment cooling device is used to cool down the first compression device, the second compression device, and the adsorption purification device.

[0015] Preferably, the control system is further used for:

[0016] The air parameters of the second compressed air after adsorption and purification are monitored, and the air parameters include at least air dew point, oil content and dust particle diameter;

[0017] If the air quality index is not up to standard, close the air supply valve of the adsorption purification device to stop supplying the second compressed air that has completed adsorption purification to the second buffer device, and open the air release valve of the adsorption purification device to release the second compressed air that has completed adsorption purification.

[0018] If the air quality meets the requirements, close the vent valve of the adsorption purification device and open the supply valve of the adsorption purification device to deliver the second compressed air that has completed adsorption purification to the second buffer device.

[0019] Preferably, the control system controls the operation of the second compression device, including:

[0020] Monitor the air supply pressure of the first buffer device;

[0021] If the gas supply pressure does not reach the starting pressure of the second compression device, the second compression device will not be started;

[0022] If the gas supply pressure reaches the starting pressure of the second compression device, the second compression device is started.

[0023] Preferably, the first compression device is an oil-free screw compressor.

[0024] Preferably, the second compression device is an oil-filled piston compressor.

[0025] Preferably, the adsorption purification device is a dual-tower adsorber.

[0026] Preferably, the first buffer device and the second buffer device are buffer tanks.

[0027] The second aspect of this invention discloses a method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air. This method is applicable to the high-pressure, high-flow-rate, oil-free, stable compressed air preparation system disclosed in the first aspect of this invention. The method includes:

[0028] The intake air is compressed to obtain the first compressed air;

[0029] The first compressed air is buffered;

[0030] The first compressed air, after buffering, is compressed to obtain a second compressed air, the pressure of which is higher than that of the first compressed air;

[0031] The second compressed air is purified by adsorption;

[0032] The second compressed air, after adsorption and purification, is buffered.

[0033] Based on the above embodiments of the present invention, a system and method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air are provided. The system includes: a first compression device for compressing incoming air to obtain first compressed air; a first buffer device for buffering the first compressed air; a second compression device for compressing the buffered first compressed air to obtain second compressed air, wherein the pressure of the second compressed air is higher than that of the first compressed air; an adsorption purification device for adsorbing and purifying the second compressed air; and a second buffer device for buffering the adsorbed and purified second compressed air. This system prepares compressed air that meets the requirements of rocket launch missions. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 A structural block diagram of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided in an embodiment of the present invention;

[0036] Figure 2 This is another structural block diagram of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided in an embodiment of the present invention;

[0037] Figure 3 This is another structural block diagram of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided in an embodiment of the present invention;

[0038] Figure 4 This is an example diagram illustrating the architecture of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided in an embodiment of the present invention.

[0039] Figure 5 A flowchart illustrating a method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air, provided as an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] Commercial space launch sites need to meet the high-pressure air supply requirements and gas standards for rocket launch missions. Therefore, this invention provides a system and method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air. The system includes a first compression device for compressing incoming air to obtain first compressed air; a first buffer device for buffering the first compressed air; a second compression device for compressing the buffered first compressed air to obtain second compressed air, the pressure of which is higher than that of the first compressed air; an adsorption purification device for adsorbing and purifying the second compressed air; and a second buffer device for buffering the adsorbed and purified second compressed air. This system prepares compressed air that meets the requirements of rocket launch missions.

[0043] In practical applications, this solution can meet the following requirements:

[0044] 1. To meet the daily high-pressure 35 MPa (which is the pressure of the second compressed air mentioned later) medium-flow air supply requirements (e.g., 500 Nm) during rocket transfer to the launch site. 3 / h).

[0045] 2. To meet the high-pressure, high-flow-rate gas demand of 35 MPa during a special period on the day of rocket launch (e.g., 4500 Nm³). 3 / h).

[0046] 3. Meets rocket gas standards: dew point ≤ -53.3℃, ​​dust particle diameter ≤ 14μm, oil content ≤ 3×10⁻⁶. -7 V / V, gas supply temperature less than or equal to 40℃.

[0047] 4. It can meet the requirement of unattended operation for the front end for 7 hours prior to launch.

[0048] See Figure 1 The diagram shows a structural block diagram of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided by an embodiment of the present invention. The preparation system includes at least: a first compression device 100, a first buffer device 200, a second compression device 300, an adsorption purification device 400, and a second buffer device 500.

[0049] Specifically, the first compression device 100 is connected to the first buffer device 200 via a pipeline, the first buffer device 200 is connected to the second compression device 300 via a pipeline, the second compression device 300 is connected to the adsorption and purification device 400 via a pipeline, and the adsorption and purification device 400 is connected to the second buffer device 500 via a pipeline.

[0050] The first compression device 100 is used to compress the intake air to obtain first compressed air. For example, the first compressed air is low-pressure compressed air with a pressure of ≤1 MPa, and the first compressed air is delivered to the first buffer device 200 through a pipeline.

[0051] The first buffer device 200 is used to buffer the first compressed air, thereby eliminating pulsations in the first compressed air; in addition, the first buffer device 200 is also used to store the buffered first compressed air. The buffered first compressed air is then transported to the second compression device 300 through a pipeline.

[0052] The second compression device 300 is used to compress the buffered first compressed air to obtain second compressed air. The pressure of the second compressed air is higher than that of the first compressed air; for example, the second compressed air is high-pressure compressed air with a pressure of 35 MPa. The second compressed air is delivered to the adsorption purification device 400 through a pipeline.

[0053] The adsorption purification device 400 is used to adsorb and purify the second compressed air. The adsorption-purified second compressed air is then transported to the second buffer device 500 through a pipeline.

[0054] The second buffer device 500 is used to buffer the second compressed air that has completed adsorption and purification, thereby eliminating pulsations in the second compressed air that has completed adsorption and purification. In addition, the second buffer device 500 is also used to store the buffered second compressed air for supplying second compressed air to the user.

[0055] In this embodiment of the invention, the second compressed air (high-pressure compressed air at 35 MPa) that meets the requirements of rocket launch mission can be prepared by using the first compression device 100, the first buffer device 200, the second compression device 300, the adsorption and purification device 400, and the second buffer device 500.

[0056] In some embodiments, the first compression device 100 (equivalent to a low-pressure compression device) is an oil-free screw compressor. The oil-free screw compressor draws in free air and performs two-stage compression to obtain first compressed air (low-pressure compressed air) with a pressure (or pressure) ≤ 1 MPa. The first compressed air enters the first buffer device 200 for buffering.

[0057] In some embodiments, see Figure 2 , Figure 2 Another structural block diagram of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system is shown, which also includes a control system 600.

[0058] Specifically, the control system 600 is connected to the first compression device 100, the first buffer device 200, the second compression device 300, the adsorption and purification device 400, and the second buffer device 500, respectively.

[0059] The control system 600 is used to control the operation of the first compression device 100, the first buffer device 200, the second compression device 300, the adsorption and purification device 400, and the second buffer device 500.

[0060] In some embodiments, the adsorption purification device 400 is a dual-tower adsorber, which purifies the second compressed air through adsorption, and the pressure drop of the second compressed air after adsorption purification is ≤0.05 MPa. Furthermore, this dual-tower adsorber can simultaneously perform adsorption purification and regeneration dehydration and deoiling, with one tower performing adsorption purification and the other performing regeneration. The operating cycle of the dual-tower adsorber is pre-set. After one operating cycle, the function of the two towers is switched by controlling the inlet and outlet valves of the two towers. The adsorption purification tower becomes the regeneration tower for dehydration and deoiling, and the regeneration tower becomes the adsorption purification tower for adsorption purification of the second compressed air.

[0061] It should be noted that the air outlet of the adsorption purification device 400 has two pipelines: an "air supply pipeline" and a "venting pipeline". The air supply pipeline of the adsorption purification device 400 is used to deliver the "second compressed air that has completed adsorption purification" to the second buffer device 500, and the venting pipeline of the adsorption purification device 400 is used to vent the "second compressed air that has completed adsorption purification".

[0062] Specifically, the "air supply line" and "venting line" of the adsorption purification device 400 are connected to the "air supply valve" and "venting valve" respectively. The "air supply valve" and "venting valve" are alternately opened and closed by monitoring the air indicators (air dew point, oil content, and dust particle diameter, etc.) of the second compressed air after adsorption purification.

[0063] Based on this, in some embodiments, the control system 600 is also used to: monitor the air parameters of the second compressed air that has completed adsorption and purification, the air parameters including at least air dew point, oil content and dust particle diameter; if the air parameters are not up to standard, close the air supply valve (located on the air supply pipeline) of the adsorption and purification device 400 to stop supplying the second compressed air that has completed adsorption and purification to the second buffer device 500, and open the air release valve (located on the vent pipeline) of the adsorption and purification device 400 to vent the second compressed air that has completed adsorption and purification; if the air parameters are up to standard, close the air release valve of the adsorption and purification device 400, and open the air supply valve of the adsorption and purification device 400 to supply the second compressed air that has completed adsorption and purification to the second buffer device 500.

[0064] In other words, when the adsorption purification device 400 adsorbs and purifies the second compressed air, the control system 600 monitors air parameters such as dew point, oil content, and dust particle diameter of the purified second compressed air. If the air parameters detected by the control system 600 are not up to standard, the vent valve of the adsorption purification device 400 is opened and the supply valve of the adsorption purification device 400 is closed, and the "purified second compressed air" with unqualified air parameters is discharged from the vent pipeline of the adsorption purification device 400.

[0065] If the air quality indicators detected by the control system 600 are within acceptable limits, the air supply valve of the adsorption purification device 400 is opened and the air release valve of the adsorption purification device 400 is closed. The "second compressed air that has completed adsorption purification" with acceptable air quality indicators is delivered from the air supply pipeline of the adsorption purification device 400 to the second buffer device 500.

[0066] In some embodiments, the first buffer device 200 and the second buffer device 500 are buffer tanks, and the pressure-bearing capacities of the first buffer device 200 and the second buffer device 500 are different. For example, the pressure-bearing capacity of the first buffer device 200 is 1.2 MPa, and the pressure-bearing capacity of the second buffer device 500 is 48 MPa.

[0067] It should be noted that the buffer tank can buffer the continuous pulsation of compressed air, eliminate the pulsation, and store the compressed air.

[0068] After receiving the first compressed air, the first buffer device 200 buffers it to eliminate pulsation, and then provides the second compression device 300 with the buffered first compressed air through the pipeline. The buffered first compressed air is a stable and continuous low-pressure compressed air.

[0069] In some embodiments, the second compression device 300 is an oil-filled piston compressor.

[0070] It should be noted that oil-lubricated reciprocating compressors use lubricating oil for lubrication, resulting in low rigidity and friction, and are characterized by high performance and long service life. Internally, the oil-lubricated reciprocating compressor compresses the first compressed air (low-pressure compressed air) four times to form the second compressed air (high-pressure compressed air). Small buffer tanks are designed before and after the compression chamber to improve the stability of the compressor's operation. The compressed high-pressure air then passes through a separator to separate and filter out trace amounts of powder generated during compressor operation. After separation and filtration, the air then enters a cooler to cool the high-pressure, high-temperature air.

[0071] In some embodiments, the process of the control system 600 controlling the operation of the second compression device 300 includes: monitoring the air supply pressure of the first buffer device 200; if the air supply pressure does not reach the start-up pressure of the second compression device 300, not starting the second compression device 300; if the air supply pressure reaches the start-up pressure of the second compression device 300, starting the second compression device 300.

[0072] Specifically, when the control system 600 detects that the air supply pressure of the first buffer device 200 has not reached the starting pressure of the second compression device 300 (oil piston compressor), it continues to pressurize the first buffer device 200; if the control system 600 detects that the air supply pressure of the first buffer device 200 has reached the starting pressure of the second compression device 300, the program of the second compression device 300 is started to compress the "first compressed air that has completed buffering", and the second compressed air can be obtained after compression.

[0073] For example: the program of the second compression device 300 is started to compress the "first compressed air that has completed buffering", and after compression, a high flow rate (2300 NM) of 35 MPa can be obtained. 3 The second compressed air ( / h).

[0074] It should be noted that in practical applications, a supply line and a vent line are provided at the gas supply end (or exhaust port) of the second compression unit 300 (oil-operated piston compressor). The vent line is equipped with a vent regulating valve. The control system 600 regulates the gas supply pressure of the second compression unit 300 by adjusting the opening of the vent regulating valve on the vent line. The vent regulating valve on the vent line of the second compression unit 300 supports closed-loop PID control, enabling it to adjust the compression pressure of the second compression unit 300 according to the user's gas usage.

[0075] Specifically, the control system 600 controls the opening of the venting adjustment on the venting pipeline of the second compression device 300 by setting a fixed pressure, thereby adjusting the air supply pressure of the second compression device 300 and the second compressed air enters the adsorption purification device 400 (double tower adsorber).

[0076] Because the reciprocating motion of the second compression device 300 (oil-filled piston compressor) causes the second compressed air (high-pressure compressed air) to pulsate, even after the second compressed air is purified by the adsorption purification device 400 (double-tower adsorber), it still pulsates. Finally, the pulsated second compressed air (high-pressure compressed air) is transported through pipeline to the second buffer device 500 (equivalent to a high-pressure buffer tank) for buffering to eliminate the pulsation, providing users with high-pressure 35Mpa high-flow oil-free stable second compressed air, thereby solving the problem of high-flow gas requirements and finished gas pulsation.

[0077] As can be seen from the above embodiments, the high-pressure, high-flow, oil-free, stable compressed air preparation system provided by the present invention has a pipeline system, which connects the first compression device 100, the first buffer device 200, the second compression device 300, the adsorption and purification device 400, the second buffer device 500, and the user in series through pipelines.

[0078] The air outlet of the adsorption purification device 400 has two pipelines: an "air supply pipeline" and a "venting pipeline". The exhaust port of the second compression device 300 is also equipped with two pipelines: an "air supply pipeline" and a "venting pipeline".

[0079] The venting pipeline of the second compression unit 300 is equipped with a venting regulating valve. This venting regulating valve supports closed-loop PID control of pressure and can adjust the gas supply pressure of the second compression unit 300 (oil piston compressor) according to the user's gas consumption.

[0080] In addition, the piping system is equipped with components such as pressure sensors, temperature sensors, pneumatic valves, and solenoid valves.

[0081] In some embodiments, see Figure 3 This diagram shows another structural block diagram of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided by an embodiment of the present invention. The preparation system further includes an equipment cooling device 700.

[0082] Specifically, the equipment cooling device 700 is connected to at least the first compression device 100, the second compression device 300, and the adsorption purification device 400.

[0083] The equipment cooling device 700 is used to cool down the first compression device 100, the second compression device 300 and the adsorption purification device 400.

[0084] The equipment cooling device 700 consists of cooling water, water pipes, a water pump, a motor, a water tank, a cooling fan, packing material, and a frequency converter. The equipment cooling device 700 provides continuous cooling to the first compression device 100, the second compression device 300, and the adsorption purification device 400. The water cooled from these devices is then returned to the cooling water cooling system for further cooling. The cooling water is cooled by increasing the heat dissipation area through the packing material and by using a fan to extract heat.

[0085] The equipment cooling device 700 monitors the cooling water pressure, flow rate, and temperature values ​​by setting sensors. Through program settings, when the control system 600 detects that the pressure, flow rate, and temperature parameters do not meet the requirements, it automatically adjusts the number of cooling fans to change the cooling water temperature and automatically adjusts the water pump frequency converter parameters to change the motor operating frequency, thereby changing the cooling water pressure and water flow rate.

[0086] It should be further explained that the equipment cooling device 700 can exchange the heat generated by the first compression device 100 (oil-free screw compressor), the second compression device 300 (oil-lubricated piston compressor), and the adsorption purification device 400 (dual-tower adsorber) through low-temperature cooling water. The water that has been heated after heat exchange is collected and returned to the cooling circulating water system, where it is cooled down by means of fans, heat dissipation packing, etc. The control system 600 monitors parameters such as pressure, temperature, and flow rate of the cooling water system through various sensors, and remotely adjusts the cooling water system parameters online in a timely manner through cooling fans, water pumps, motors, and frequency converters.

[0087] In practical applications, the control system 600 consists of pressure sensors, temperature sensors, pneumatic valves, solenoid valves, control cabinets, control software, cables, etc. It uses various sensors to monitor various devices and controls the entire process of the equipment through pneumatic valves, solenoid valves, regulating valves, frequency converters, etc.

[0088] Specifically, the control system 600 enables information exchange among all devices, programs the first compression device 100, the second compression device 300, the adsorption purification device 400, and the equipment cooling device 700, and establishes full-process online monitoring and control of the first compression device 100, the second compression device 300, the adsorption purification device 400, and the equipment cooling device 700 through components and information facilities, meeting the requirements of unattended operation at the front end for daily use and for the seven hours prior to launch.

[0089] To better understand the high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided in this embodiment of the invention, through... Figure 4 An example diagram of the architecture of a high-pressure, high-flow-rate, oil-free, stable compressed air preparation system is shown below for illustration.

[0090] like Figure 4 As shown, the preparation system includes: a first compression device 100, a first buffer device 200, a second compression device 300, an adsorption purification device 400, a second buffer device 500, a control system 600, an equipment cooling device 700, and a chilled water system 800.

[0091] The first compression device 100 is an oil-free screw compressor, the first buffer device 200 is a low-pressure buffer tank, the second compression device 300 is an oil-filled piston compressor, the adsorption and purification device 400 is a double-tower adsorber, the second buffer device 500 is a high-pressure buffer tank, the adsorption and purification device 400 is equipped with an vent valve 401 on its vent pipeline, and the second compression device 300 is equipped with an vent regulating valve 301 on its vent pipeline.

[0092] An oil-free screw compressor compresses air into first compressed air (pressure ≤ 1 MPa). The first compressed air enters a low-pressure buffer tank for buffering. After buffering, the first compressed air enters an oil-lubricated piston compressor for compression to obtain second compressed air (35 MPa). The second compressed air enters a dual-tower adsorber, which adsorbs and purifies the second compressed air. The adsorbed and purified second compressed air enters a high-pressure buffer tank for buffering. The buffered and stable second compressed air is then delivered to the user.

[0093] The equipment cooling device 700 centrally cools down the heat generated by the oil-free screw compressor, the oil-lubricated piston compressor, and the twin-tower adsorber.

[0094] The 600 control system uses various components such as temperature sensors, pressure sensors, and solenoid valves to monitor and control all equipment throughout the entire process, enabling unattended operation on site.

[0095] In some specific embodiments, both the dual-tower adsorber and the oil-filled piston compressor of this solution use nitrogen as the valve control gas. At the same time, two redundant pipelines for air control gas are provided at the exhaust port of the dual-tower adsorber and the first-stage intake buffer tank of the oil-filled piston compressor (the buffer tank that is integrated with the oil-filled piston compressor). These two redundant pipelines are respectively connected to the control solenoid valves of the dual-tower adsorber and the oil-filled piston compressor.

[0096] In an emergency where nitrogen is unavailable, the manual shut-off valves on these two redundant pipelines are opened. Once the control program of the preparation system is activated, the oil-free screw compressor is started first. The first compressed air from the oil-free screw compressor enters these two redundant pipelines sequentially through the exhaust port of the twin-tower adsorber and the first-stage intake buffer tank of the oil-lubricated reciprocating compressor (the oil-lubricated reciprocating compressor has its own buffer tank). Subsequently, the first compressed air enters the solenoid valve, actuating the valve to open and close, thereby controlling the process flow of the preparation system. This design can effectively replace nitrogen as the control gas in emergency situations where nitrogen is unavailable, increasing the stability and flexibility of the preparation system.

[0097] The above preparation system can achieve the following effects:

[0098] Effect 1: Using two sets of compressor units in parallel operation can simultaneously meet the daily medium flow gas supply and the high flow gas supply demand during special periods on launch days.

[0099] Effect 2: The compressed gas dew point temperature can eventually reach -76.5℃, and the dust particle diameter is ≤5μm; the oil content is 3.9×10 -9 V / V, gas supply temperature ≤35℃, all indicators meet user requirements.

[0100] Effect 3: Enables unattended operation of the front end for 7 hours prior to launch.

[0101] Effect 4: It can meet different pressure requirements within 35 MPa.

[0102] Compared with the prior art, the preparation system provided in this embodiment of the invention has the following improvements:

[0103] Improvement 1: In oil-lubricated piston compressors, the lubrication of the oil changes the friction between the cylinder and piston from dry friction to liquid friction, forming a lubricating oil film between the two contact surfaces, resulting in less friction. Adding oil to the packing not only extends the life of the packing but also improves the sealing performance of the sealing packing to a certain extent, thereby improving the compression efficiency.

[0104] Improvement 2: The dual-tower adsorber can perform adsorption and regeneration processes simultaneously. The operating program can be set in advance, and the adsorption purification tower and regeneration tower will automatically switch after completing one operating cycle. The adsorption purification tower will become the regeneration tower, and the regeneration tower will become the adsorption purification tower, thus meeting the needs of continuous purified air use at the launch site.

[0105] Improvement point 3: The oil-filled piston compressor, as a high-pressure compression device, requires a large flow of high-pressure air (35 MPa compressed air, ≥4500 Nm / hour) during a special period on the day of rocket launch. 3 / h), a single oil-filled piston compressor can reach a pressure of 35 MPa and a flow rate of 2300 Nm³ / h.3 / h, both conditions can be met simultaneously by having two units operating at the same time.

[0106] Improvement point 4: In emergency situations where nitrogen is unavailable, it can effectively replace nitrogen as a control gas, increasing the stability and flexibility of the preparation system.

[0107] Improvement point 5: The valves in the low-pressure stage of the preparation system are both manual and automatic. When the remote control mode cannot be started, manual control can be performed on-site. The main circuit of the high-pressure stage of the preparation system is controlled by pneumatic valves. High-pressure manual shut-off valves are connected to the front and rear ends of the pneumatic shut-off valves in the main circuit. When the pneumatic shut-off valves malfunction, the system can promptly reach the site for handling.

[0108] Improvement point 6: The oil-lubricated piston compressor has a gas supply line and a vent line at the rear end. The vent line is equipped with a vent regulating valve, which can adjust the opening degree of the regulating valve during operation by setting PID pressure parameters, thereby controlling the operating pressure of the oil-lubricated piston compressor. During special periods on launch days when a large amount of gas is needed, using the vent regulating valve to adjust the compressed gas volume can keep the flow rate and pressure stable.

[0109] Corresponding to the high-pressure, high-flow-rate, oil-free, stable compressed air preparation system provided in the above embodiments of the present invention, see also... Figure 5 This invention also provides a flowchart of a method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air. This preparation method is applicable to the preparation system provided in the above embodiments, and includes:

[0110] Step S501: Compress the intake air to obtain first compressed air.

[0111] Step S502: Buffer the first compressed air.

[0112] Step S503: Compress the first compressed air that has been buffered to obtain a second compressed air, the pressure of the second compressed air being higher than that of the first compressed air.

[0113] Step S504: The second compressed air is purified by adsorption.

[0114] Step S505: Buffer the second compressed air that has completed adsorption and purification.

[0115] It should be noted that, Figure 5 The execution principle of the preparation method shown has been described in detail in the above embodiments regarding the preparation system, and can be found therein, so it will not be repeated here.

[0116] In summary, this invention provides a system and method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air. A first compression device compresses incoming air to obtain first compressed air; a first buffer device buffers the first compressed air; a second compression device compresses the buffered first compressed air to obtain second compressed air, the pressure of which is higher than that of the first compressed air; an adsorption purification device purifies the second compressed air; and a second buffer device buffers the adsorbed and purified second compressed air. This system prepares compressed air that meets the requirements of rocket launch missions.

[0117] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0118] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0119] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for preparing high-pressure, high-flow-rate, oil-free, stable compressed air, characterized in that, The preparation system includes at least: a first compression device, a first buffer device, a second compression device, an adsorption purification device, and a second buffer device; The first compression device is used to compress the intake air to obtain first compressed air; The first buffer device is used to buffer the first compressed air; The second compression device is used to compress the buffered first compressed air to obtain a second compressed air, wherein the pressure of the second compressed air is higher than that of the first compressed air. The adsorption purification device is used to adsorb and purify the second compressed air; The second buffer device is used to buffer the second compressed air after it has been adsorbed and purified.

2. The preparation system according to claim 1, characterized in that, The preparation system further includes: a control system; The control system is used to control the operation of the first compression device, the first buffer device, the second compression device, the adsorption purification device, and the second buffer device.

3. The preparation system according to claim 1 or 2, characterized in that, The preparation system further includes: an equipment cooling device; The equipment cooling device is used to cool down the first compression device, the second compression device, and the adsorption purification device.

4. The preparation system according to claim 2, characterized in that, The control system is also used for: The air parameters of the second compressed air after adsorption and purification are monitored, and the air parameters include at least air dew point, oil content and dust particle diameter; If the air quality index is not up to standard, close the air supply valve of the adsorption purification device to stop supplying the second compressed air that has completed adsorption purification to the second buffer device, and open the air release valve of the adsorption purification device to release the second compressed air that has completed adsorption purification. If the air quality meets the requirements, close the vent valve of the adsorption purification device and open the supply valve of the adsorption purification device to deliver the second compressed air that has completed adsorption purification to the second buffer device.

5. The preparation system according to claim 2, characterized in that, The control system controls the operation of the second compression device, including: Monitor the air supply pressure of the first buffer device; If the gas supply pressure does not reach the starting pressure of the second compression device, the second compression device will not be started; If the gas supply pressure reaches the starting pressure of the second compression device, the second compression device is started.

6. The preparation system according to claim 1, characterized in that, The first compression device is an oil-free screw compressor.

7. The preparation system according to claim 1, characterized in that, The second compression device is an oil-filled piston compressor.

8. The preparation system according to claim 1, characterized in that, The adsorption purification device is a dual-tower adsorber.

9. The preparation system according to claim 1, characterized in that, The first buffer device and the second buffer device are buffer tanks.

10. A method for preparing high-pressure, high-flow-rate, oil-free, stable compressed air, characterized in that, The method is applicable to the high-pressure, high-flow-rate, oil-free, stable compressed air preparation system according to any one of claims 1-9, and the method includes: The intake air is compressed to obtain the first compressed air; The first compressed air is buffered; The first compressed air, after buffering, is compressed to obtain a second compressed air, the pressure of which is higher than that of the first compressed air; The second compressed air is purified by adsorption; The second compressed air, after adsorption and purification, is buffered.

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