Instrument air supply system

Abstract

The utility model discloses an instrument air supply system, including gas holder, carbon dioxide ball tank, air compressor and pressure transmitter, carbon dioxide ball tank is communicated to the air inlet end of gas holder, air compressor is communicated to the air inlet end of gas holder and is parallelly connected with carbon dioxide ball tank, and pressure transmitter is connected in the air outlet end of gas holder and is connected with air compressor communication, and air compressor is configured to open when pressure transmitter detects that the air outlet pressure of gas holder is not stable or is lower than the preset value, to carry out the air supplement of gas holder, the instrument air supply system of the utility model uses carbon dioxide ball tank (main gas source) and air compressor (auxiliary gas source) as gas source simultaneously, and air compressor does not intervene in the air supply when carbon dioxide air supply is stable, only intervenes in the air supply when the air consumption of downstream instrument increases or carbon dioxide air supply is not stable, makes carbon dioxide not exhaust into the atmosphere, reduces the enterprise production cost while solving the environmental protection problem, and energy -conserving and emission -reducing.

Description

Technical Field

[0001] This utility model belongs to the field of instrument air technology, specifically relating to an instrument air supply system that links residual gas from a spherical tank with an air compressor. Background Technology

[0002] Instrument air is the air source for regulating structures in automated instruments, such as pneumatic valves and flow meters. It is characterized by high purity and requires dehydration and purification before use. Instrument air typically refers to compressed gas with a dew point below -40°C, and it undergoes both water and oil removal processes. Ensuring gas purity is crucial for the stable operation of automated instruments; the quality of the instrument air directly affects the performance and accuracy of the regulating mechanism.

[0003] Currently, instrument air is typically supplied by compressed air from air compressors. Residual carbon dioxide gas at the gas supply plant is mostly vented out, and the residual gas in the carbon dioxide tanks is clean and, after drying, can replace the air compressor as a gas source. However, fluctuations in the residual gas in the upstream carbon dioxide tanks can lead to unstable downstream pressure, or excessive downstream instrument air consumption can prevent the pressure reducing valve from quickly adjusting the pressure, thus affecting the performance and accuracy of the instruments.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide an improved instrument air supply system to meet the performance and accuracy requirements of downstream instruments.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides an instrument air supply system, including an air storage tank, a carbon dioxide spherical tank, an air compressor, and a pressure transmitter. The carbon dioxide spherical tank is connected to the air inlet of the air storage tank; the air compressor is connected to the air inlet of the air storage tank and is connected in parallel with the carbon dioxide spherical tank; the pressure transmitter is connected to the air outlet of the air storage tank and is communicatively connected to the air compressor; the air compressor is configured to start when the pressure transmitter detects that the air outlet pressure of the air storage tank is unstable or lower than a preset value, so as to replenish the air in the air storage tank.

[0007] In one or more embodiments of this utility model, a first pressure gauge is further provided between the carbon dioxide spherical tank and the gas storage tank, and the first pressure gauge is communicatively connected to the air compressor.

[0008] In one or more embodiments of this utility model, the first pressure gauge and pressure transmitter are connected to the air compressor through a DCS control system.

[0009] In one or more embodiments of this utility model, a pressure reducing valve is provided between the first pressure gauge and the carbon dioxide spherical tank.

[0010] In one or more embodiments of this utility model, the carbon dioxide spherical tank and the gas storage tank include a main pipeline and two parallel pipelines provided on the main pipeline. Each parallel pipeline is provided with the pressure reducing valve and two control valves provided at both ends of the pressure reducing valve. The first pressure gauge is provided on the main pipeline between the parallel pipelines and the gas storage tank.

[0011] In one or more embodiments of this utility model, a second pressure gauge is provided on the main pipeline between the parallel pipeline and the carbon dioxide spherical tank.

[0012] In one or more embodiments of this utility model, a safety valve is also provided on the main pipeline between the parallel pipeline and the gas storage tank.

[0013] In one or more embodiments of this utility model, a main valve is provided between the safety valve and the gas storage tank.

[0014] In one or more embodiments of this utility model, the control valve is a shut-off valve or a ball valve.

[0015] In one or more embodiments of this utility model, a check valve is also connected between the air compressor and the air tank.

[0016] Compared with existing technologies, the instrument air supply system of this utility model uses both carbon dioxide spherical tanks and air compressors as air sources. The carbon dioxide spherical tanks serve as the main air source, while the air compressors serve as auxiliary air sources. The air compressors do not intervene in the air supply when the carbon dioxide supply is stable. They only intervene in the air supply when the downstream instrument air consumption increases or when the upstream carbon dioxide supply is unstable, so that carbon dioxide is not discharged into the atmosphere. This solves the environmental protection problem while reducing the enterprise's production costs and saving energy and reducing emissions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the instrument air supply system in one embodiment of the present invention.

[0019] Explanation of key figure labels:

[0020] 100-Instrument air supply system, 10-Air storage tank, 20-Carbon dioxide spherical tank, 30-Pressure transmitter, 40-Air compressor, 51-First pressure gauge, 52-Pressure reducing valve, 53-Control valve, 54-Second pressure gauge, 55-Safety valve, 56-Main valve, 57-Check valve, 60-DCS control system, 71-Main pipeline, 72-Parallel pipeline. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0022] like Figure 1 As shown, in one embodiment of this utility model, the instrument air supply system 100 includes an air storage tank 10, a carbon dioxide spherical tank 20, a pressure transmitter 30, and an air compressor 40. The air storage tank 10 is an air storage container used to store gas and then supply it to the instrument. The carbon dioxide spherical tank 20 is a storage container for residual carbon dioxide gas. It is connected to the air inlet of the air storage tank 10 and supplies gas to the air storage tank 10, but no longer directly discharges it into the atmosphere. The pressure transmitter 30 is located at the air outlet of the air storage tank 10 and is used to monitor the pressure of the gas supplied to the downstream instrument. The air compressor 40 is connected to the air inlet of the air storage tank 10 and is communicatively connected to the pressure transmitter 30.

[0023] In this embodiment, the instrument air supply system 100 uses both a carbon dioxide tank 20 and an air compressor 40 as air sources. The former serves as the primary air source, while the latter acts as an auxiliary air source. When the air supply is stable, the carbon dioxide tank 20 supplies air, and the air compressor 40 does not intervene in the air supply. However, when the downstream instrument air consumption increases, the pressure transmitter 30 detects unstable or insufficient air pressure in the storage tank 10 and activates to intervene in the air supply to stabilize the air pressure in the storage tank 10. After the pressure transmitter 30 monitors the air supply pressure and confirms that it has remained stable within the set value for an extended period, the air compressor 40 shuts down and stops supplying air. Therefore, by using the carbon dioxide tank 20 and the air compressor 40 for coordinated air supply, the carbon dioxide emission problem is solved to a certain extent, while the operating time of the air compressor 40 is reduced. This addresses environmental issues while simultaneously reducing enterprise production costs, achieving energy conservation and emission reduction.

[0024] Preferably, a first pressure gauge 51 is also installed between the carbon dioxide spherical tank 20 and the gas storage tank 10, which is communicatively connected to the air compressor 40. When there is a large fluctuation in the residual gas upstream of the gas storage tank 10, and the first pressure gauge 51 detects a sudden drop in the gas supply pressure (entering the gas storage tank 10), the air compressor 30 starts and intervenes in the gas supply, stabilizing the inlet pressure of the gas storage tank 10 to meet the downstream gas supply pressure. By installing the pressure transmitter 30 and the first pressure gauge 51, monitoring mechanisms are provided at both the inlet and outlet ends of the gas storage tank 10, simultaneously monitoring the inlet pressure at the gas storage tank 10 end and the inlet pressure at the instrument end, further improving the stability of the entire system's gas supply.

[0025] In one embodiment, the first pressure gauge 51 and the pressure transmitter 30 are connected to the air compressor 40 through a DCS control system 60 (Distributed Control System). The DCS control system 60 receives data from the first pressure gauge 51, the pressure transmitter 30, or other sensors, and controls the air compressor 40 to turn on or off according to system settings.

[0026] Since the air pressure inside the input instrument is generally lower than the air pressure inside the carbon dioxide tank 20, the output air pressure of the carbon dioxide tank 20 needs to be reduced before being input into the storage tank 10. Figure 1 In the embodiment shown, a pressure reducing valve 52 is provided between the first pressure gauge 51 and the carbon dioxide spherical tank 20, so that the gas pressure output from the carbon dioxide spherical tank 20 is reduced to the instrument air pressure requirement before entering the gas storage tank 10.

[0027] Preferably, the system includes a main pipeline 71 and two parallel pipelines 72 between the carbon dioxide spherical tank 20 and the gas storage tank 10. Each parallel pipeline 72 is equipped with the aforementioned pressure reducing valve 52 and two control valves 53 respectively located at both ends of the pressure reducing valve 52. A first pressure gauge 51 is installed on the main pipeline 71 between the parallel pipelines 72 and the gas storage tank 10. The two control valves 53 can be selected from valves such as shut-off valves and ball valves; this embodiment is not limited to these types.

[0028] During operation, one parallel pipeline 72 operates normally, while the other parallel pipeline 72 is not in operation. When the pressure reducing valve 52 in the operating parallel pipeline 72 malfunctions, the two control valves 53 on both sides of it can be closed to shut down that parallel pipeline 72. Simultaneously, the two control valves 53 and the pressure reducing valve 52 in the other parallel pipeline 72 are opened, allowing that parallel pipeline 72 to take over operation. Therefore, this configuration improves the stability of the entire pipeline, enabling the use of the other pipeline when the commonly used pressure reducing valve 52 fails, and allowing for timely replacement and repair of the damaged pressure reducing valve 52 without affecting the normal operation of the entire system.

[0029] In one embodiment, a second pressure gauge 54 is installed on the main pipeline 71 between the two parallel pipelines 72 and the carbon dioxide spherical tank 20. The second pressure gauge 54 is the upstream main pipeline pressure gauge, which is used to monitor whether the output pressure of the carbon dioxide spherical tank 20 is stable. When the output pressure is stable, the pressure is adjusted and reduced.

[0030] Preferably, a safety valve 55 is also provided on the main pipeline 71 between the two parallel pipelines 72 and the gas storage tank 10. The safety valve 55 is located downstream of the first pressure gauge 51 and is used to open and vent the gas after the gas pressure input to the gas storage tank 10 exceeds the set value, so as to reduce the input gas pressure to the set range.

[0031] In one embodiment, a main valve 56 is also provided on the main pipeline 71 at the front end of the gas storage tank 10. The main valve 56 is directly connected to the gas storage tank 10 and is used to directly control the opening and closing of the main pipeline 71 connected to the gas storage tank 10. In an emergency, the entire pipeline can be shut off by the main valve 56 to avoid danger, component maintenance, and other situations.

[0032] Preferably, a check valve 57 is also provided between the air compressor 40 and the air tank 10 to control the connection and disconnection of the pipeline between the air compressor 40 and the air tank 10. The check valve 57 is opened when the air compressor 40 is engaged and closed when the air compressor 40 is not needed, so as to avoid the air compressor 40 from being engaged unexpectedly due to reasons such as operator misoperation or air compressor 40 failure, thereby improving stability.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An instrument air supply system, characterized in that, include: gas tank; A carbon dioxide spherical tank is connected to the inlet end of the gas storage tank; An air compressor is connected to the air inlet of the air storage tank and is connected in parallel with the carbon dioxide spherical tank; as well as A pressure transmitter is connected to the outlet of the air storage tank and communicates with the air compressor. The air compressor is configured to start when the pressure transmitter detects that the outlet pressure of the air tank is unstable or lower than a preset value, so as to replenish the air tank.

2. The instrument air supply system according to claim 1, characterized in that, A first pressure gauge is also installed between the carbon dioxide spherical tank and the gas storage tank, and the first pressure gauge is communicatively connected to the air compressor.

3. The instrument air supply system according to claim 2, characterized in that, The first pressure gauge and pressure transmitter are connected to the air compressor through a DCS control system.

4. The instrument air supply system according to claim 2, characterized in that, A pressure reducing valve is installed between the first pressure gauge and the carbon dioxide spherical tank.

5. The instrument air supply system according to claim 4, characterized in that, The carbon dioxide spherical tank and the gas storage tank are connected by a main pipeline and two parallel pipelines on the main pipeline. Each parallel pipeline is equipped with a pressure reducing valve and two control valves at both ends of the pressure reducing valve. The first pressure gauge is located on the main pipeline between the parallel pipelines and the gas storage tank.

6. The instrument air supply system according to claim 5, characterized in that, A second pressure gauge is installed on the main pipeline between the parallel pipeline and the carbon dioxide spherical tank.

7. The instrument air supply system according to claim 5, characterized in that, A safety valve is also installed on the main pipeline between the parallel pipeline and the gas storage tank.

8. The instrument air supply system according to claim 7, characterized in that, A main valve is installed between the safety valve and the gas storage tank.

9. The instrument air supply system according to claim 5, characterized in that, The control valve is a gate valve or a ball valve.

10. The instrument air supply system according to claim 1, characterized in that, A check valve is also connected between the air compressor and the air tank.

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