Low-dew-point intelligent air-nitrogen system

Abstract

The embodiment of the utility model discloses a low-dew-point intelligent air-nitrogen system, which comprises an air compression assembly, an air supply assembly and a control assembly, the air inlet end of the pretreatment assembly is connected with the air outlet end of the air compression assembly, and the pretreatment assembly is used for purifying and drying the compressed air; the gas inlet end of the nitrogen making assembly is connected with the gas outlet end of the pretreatment assembly, and the nitrogen making assembly is used for making nitrogen; the gas inlet end of the gas conveying pipeline is connected with the gas outlet end of the nitrogen generation assembly, and the gas outlet end of the gas conveying pipeline is used for being connected with equipment to be supplied with gas; and the conveying regulator is arranged on the gas conveying pipeline. The intelligence of the air-nitrogen system is improved, and the quality of finally blown nitrogen is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of nitrogen making, especially relates to a low dew point intelligent air nitrogen system. BACKGROUND

[0002] With the development of petroleum industry, the oil reserves are decreasing year by year, and the exploitation of oil is more and more difficult. Nearly 2 / 3 of the crude oil is blocked in the ground because of the failure of primary and secondary recovery, and exploring more efficient and environmentally friendly new methods and new technologies has become inevitable for the development of the times.

[0003] After comparison and exploration in recent years, nitrogen has been paid more and more attention due to its easy availability, relative inertness, effective cooling of the nosepiece and other characteristics. Nitrogen injection technology is not only suitable for conventional reservoirs, but also for thin oil, heavy oil, offshore, hilly, deep oil, oil reservoirs close to depletion or oil reservoirs in the early stage of development. In addition, nitrogen is not miscible with oil and water, and is widely available. It is mainly used for secondary and tertiary oil recovery, drilling and completion, oil and gas well protection, pressure maintenance and gas storage, inert protection of drilling platforms, pipeline and equipment purging, and protection gas for transportation of flammable and explosive materials.

[0004] In recent years, with the resource restructuring of major domestic and foreign oil and gas field groups and the upgrading of injection and recovery technology, the existing air nitrogen system has the problems of low efficiency and quality.

[0005] There is no effective solution to the above problems in the prior art. CONTENT OF THE UTILITY MODEL

[0006] To solve the above problems, the utility model provides a low dew point intelligent air nitrogen system, which improves the quality of nitrogen by intelligently designing the system, to solve the problems of low efficiency and quality of the existing air nitrogen system.

[0007] To achieve the above purpose, the utility model provides a low dew point intelligent air nitrogen system, which comprises: an air compression assembly for providing compressed air; a pretreatment assembly connected to the air outlet end of the air compression assembly for purifying and drying the compressed air; a nitrogen making assembly connected to the air outlet end of the pretreatment assembly for making nitrogen; a gas delivery pipeline connected to the air outlet end of the nitrogen making assembly, and an air outlet end for connecting to a gas supply device; and a delivery regulator provided on the gas delivery pipeline.

[0008] Further, the nitrogen making assembly is at least two, one of which is a running nitrogen making assembly, and the other is a standby nitrogen making assembly.

[0009] Further, a backup machine control module is electrically connected with the running nitrogen production assembly and the backup nitrogen production assembly, and is used to start the backup nitrogen production assembly when the required flow is greater than the preset flow.

[0010] Further, a self-regulating valve is arranged on the detection pipeline in the gas conveying pipeline, and is used to stabilize pressure.

[0011] Further, a feedback regulating assembly is arranged, which comprises a pressure gauge and an automatic controller.

[0012] Further, the air compression assembly comprises an air compressor and a compressed air storage tank.

[0013] Further, the preprocessing assembly comprises a high-temperature combined dryer and a filter group.

[0014] Further, an instrument control interlock is arranged, which is electrically connected with each assembly, and is used to control each assembly.

[0015] The above technical solution has the following beneficial effects: human operation errors are reduced through automatic control, and system operation efficiency is improved; system stability is enhanced, changes are automatically adjusted and responded, and continuity of nitrogen supply is maintained; the backup nitrogen production assembly and the self-regulating valve ensure seamless switching when the main system fails, guarantee continuous gas supply, and improve system reliability; maintenance cost is reduced, and maintenance work is simplified through automatic control and monitoring functions of the system, maintenance cost and downtime are reduced, and system reliability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0017] Figure 1 is a structural schematic diagram of the low-dew-point intelligent air and nitrogen system provided by the embodiment of the present application.

[0018] Reference signs: 1-air compression assembly; 101-air compressor; 102-compressed air storage tank; 2-preprocessing assembly; 3-nitrogen production assembly; 4-gas conveying pipeline; 5-conveying regulator. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] To solve the problems in the prior art, the embodiments of the present application provide a low-dew-point intelligent air and nitrogen system, Figure 1 is a structural schematic diagram of the low-dew-point intelligent air and nitrogen system provided by the embodiments of the present application, as Figure 1 shown, the system comprises: an air compression assembly 1, the air compression assembly 1 is used for providing compressed air; a preprocessing assembly 2, the air inlet end of the preprocessing assembly 2 is connected with the air outlet end of the air compression assembly 1, and the preprocessing assembly 2 is used for purifying and drying the compressed air; a nitrogen production assembly 3, the air inlet end of the nitrogen production assembly 3 is connected with the air outlet end of the preprocessing assembly 2, and the nitrogen production assembly 3 is used for producing nitrogen; a gas conveying pipeline 4, the air inlet end of the gas conveying pipeline 4 is connected with the air outlet end of the nitrogen production assembly 3, and the air outlet end is used for connecting a device to be supplied with air; and a conveying regulator 5, the conveying regulator 5 is arranged on the gas conveying pipeline 4.

[0021] The system comprises an air compression assembly 1, which is responsible for providing compressed air. The air compressor 101 is the core part of the system, which compresses atmospheric air to the required pressure level.

[0022] The air inlet end of the preprocessing assembly 2 is connected with the air outlet end of the air compression assembly 1. The assembly is used for purifying and drying the compressed air to remove impurities and moisture therein, and ensure the quality of the gas in the nitrogen production process.

[0023] The air inlet end of the nitrogen production assembly 3 is connected with the air outlet end of the preprocessing assembly 2, and the nitrogen production assembly 3 is used for producing nitrogen. The assembly uses adsorption or membrane separation technology to separate nitrogen from the compressed air after preprocessing.

[0024] The air inlet end of the gas conveying pipeline 4 is connected with the air outlet end of the nitrogen production assembly 3, and the air outlet end is used for connecting a device to be supplied with air. The gas conveying pipeline 4 is responsible for conveying the produced nitrogen to the required device or system.

[0025] The delivery regulator 5 is arranged on the gas delivery pipeline 4 to adjust the flow rate and pressure of the nitrogen gas to meet the gas demand of different equipment. The gas delivery regulator can adjust the flow rate and pressure online, and is designed with high and low control feedback points to automatically control the gas delivery state associated with each gas parameter, and to meet the gas demand of different processes.

[0026] As an optional embodiment, the delivery regulator 5 includes a flow meter, a pressure gauge, a regulating valve, and a controller. The flow meter and the pressure gauge monitor the flow rate and pressure of the nitrogen gas in the gas delivery pipeline 4 in real time, and the monitored data is transmitted to the controller. The controller compares the data with the pre-set flow rate threshold and pressure threshold, calculates the adjustment amount, and then adjusts the opening degree of the regulating valve according to the adjustment amount to achieve gas delivery control. The pre-set values are set according to the equipment to be supplied with gas.

[0027] As an optional embodiment, the nitrogen generation assembly 3 is at least two, one of which is a running nitrogen generation assembly 3 and the other is a standby nitrogen generation assembly 3.

[0028] In the system, at least two sets of nitrogen generation assemblies 3 are arranged, including a running nitrogen generation assembly 3 and a standby nitrogen generation assembly 3, which are connected to the pretreatment assembly 2 and the gas delivery pipeline 4 through pipelines. When the running nitrogen generation assembly 3 fails or needs maintenance, the standby nitrogen generation assembly 3 can be immediately put into use to ensure that the system can continuously and stably supply gas and reduce the risk of production interruption. In addition, this configuration also allows the system to flexibly switch the nitrogen generation assembly 3 according to the actual gas demand, or to run two nitrogen generation assemblies 3 at the same time to provide more nitrogen gas output under high demand.

[0029] As an optional embodiment, a standby machine control module is electrically connected to the running nitrogen generation assembly 3 and the standby nitrogen generation assembly 3 to start the standby nitrogen generation assembly 3 when the required flow rate is greater than the pre-set flow rate.

[0030] The standby machine control module is electrically connected to the running nitrogen generation assembly 3 and the standby nitrogen generation assembly 3 to monitor the running state of the system in real time. The module is built-in with a flow rate monitoring and control system, which can compare the output flow rate of the main nitrogen generation assembly 3 with the pre-set flow rate threshold. When it is detected that the output flow rate of the main nitrogen generation assembly 3 cannot meet the gas demand of the downstream equipment, i.e., the actual flow rate is lower than the pre-set flow rate, the standby machine control module will automatically start the standby nitrogen generation assembly 3 to increase the supply of nitrogen gas.

[0031] According to the required gas flow, purity and pressure range, when the downstream gas demand changes, when the downstream nitrogen flow increases rapidly, the gas consumption of the instrument air system, when the real-time instrument air system uses compressed air, the flow is ≤580 Nm3 / h, the second nitrogen generating device can be automatically opened to produce nitrogen to increase the nitrogen production to meet the downstream nitrogen demand. When the total nitrogen production is 1050 Nm3 / h, the two nitrogen generating devices run stably.

[0032] As an optional implementation, the system further comprises a self-regulating valve, which is arranged on the detection pipeline in the gas conveying pipeline 4 and used for pressure stabilization.

[0033] The self-regulating valve is an automatic regulating valve that can work independently without external energy. It senses the pressure change in the pipeline through internal mechanical structure and automatically adjusts the opening of the valve to maintain constant pressure. The design of this valve usually includes a spring-loaded valve, one side of which is connected to the pipeline pressure and the other side is opposed to the spring force. When the pipeline pressure changes, the valve moves to offset the pressure change, thereby maintaining the set pressure level.

[0034] The installation position of the self-regulating valve is usually located on the detection pipeline of the gas conveying pipeline 4, so that the pressure can be monitored and adjusted without affecting the main gas flow. The design and selection of this valve need to consider the maximum flow, highest pressure and required pressure regulation range of the system to ensure its effective work under various working conditions. By adding a self-regulating valve in the system, the stability and safety of the air and nitrogen system can be significantly improved to meet the strict requirements in industrial applications.

[0035] As an optional implementation, the system further comprises a feedback regulation component: the feedback regulation component comprises a pressure gauge and an automatic controller; the pressure gauge is arranged on the pipeline at the outlet end of the pretreatment component 2 to measure the gas pressure; the automatic controller is electrically connected with the pressure gauge, the inlet valve of the nitrogen generating component 3 and the air compression component 1, and is used to control the inlet valve to be closed and the compression force of the air compression component 1 to be increased when the gas pressure detected by the pressure gauge is lower than the predetermined gas pressure.

[0036] The feedback regulation component consists of two parts: a pressure gauge and an automatic controller. The pressure gauge is installed on the outlet pipeline of the pretreatment component 2 to measure the gas pressure of the pretreated compressed air in real time. This measurement is crucial to the system because it is directly related to the working efficiency of the nitrogen generating component 3 and the quality of the final nitrogen product.

[0037] When the supply of compressed air increases after the pretreatment system and the output pressure of the nitrogen generating component 3 is lower than 0.6 MPa, the inlet of the nitrogen generating component 3 is automatically closed through the pressure signal, the use pressure of the compressed air in the instrument air system is increased, and the stable operation of the equipment is maintained.

[0038] As an optional implementation, the air compression assembly 1 includes an air compressor 101 and a compressed air storage tank 102.

[0039] The air compressor 101 is the main equipment of the air compression assembly 1, whose function is to suck in and compress air at atmospheric pressure to the required pressure level. According to the system's needs, the air compressor 101 can be a reciprocating, rotary screw, centrifugal or other type of compressor, and the choice of which type depends on factors such as the required pressure, flow and efficiency. The air compressor 101 is usually equipped with a motor drive that automatically adjusts the speed according to the required amount and pressure of compressed air, to achieve energy-saving and efficient operation.

[0040] The compressed air storage tank 102 is used in conjunction with the air compressor 101 to store compressed air, to balance the air flow and pressure fluctuations in the system. The storage tank can reduce the frequent start and stop of the air compressor 101, thereby prolonging its service life and providing stable compressed air supply. The storage tank also helps to reduce moisture and impurities that may be generated during compression, as these substances are more easily precipitated and separated in the storage tank.

[0041] As an optional implementation, the pretreatment assembly 2 includes a high-temperature combined dryer and a filter group.

[0042] The high-temperature combined dryer is the key equipment in the pretreatment assembly 2, used to remove moisture from compressed air. It usually works at a higher temperature, which can more effectively absorb and discharge moisture in compressed air. This dryer may use various drying techniques, such as adsorption drying, membrane separation drying or freeze drying, etc., to adapt to different drying efficiency and dew point requirements. The design of the high-temperature combined dryer enables it to maintain stable drying effect in continuous operation, while having the ability of self-regeneration, reducing maintenance requirements and operating costs.

[0043] The filter group is used to remove solid particles, oil mist and other impurities from compressed air to protect the nitrogen production assembly 3 from contamination. The filter group may include primary filters, intermediate filters and high-efficiency filters, which are arranged in a certain order to ensure that the gas reaches the required cleanliness before entering the nitrogen production assembly 3. The filters can be replaced or cleaned as needed to maintain their filtering efficiency and ensure long-term stable operation of the system.

[0044] As an optional implementation, the instrument control interlock is electrically connected with each assembly for controlling each assembly.

[0045] The instrument control interlock integrates control logic and interface, can receive signals from various sensors in the system, and control corresponding actuators such as valves, compressors and dryers according to these signals. Through the instrument control interlock, the system can realize automatic operation, reduce manual intervention, improve the convenience of operation and the response speed of the system. The instrument control interlock can monitor the key parameters in the system in real time, such as pressure, flow, temperature and humidity, and automatically adjust according to the preset control strategy to maintain the optimal operating state of the system. The instrument control interlock also has safety protection function, which can automatically take measures such as closing the valve or stopping when detecting abnormal conditions such as overpressure, overtemperature and flow anomaly, to protect the safety of the system and the operator. That is, the compressed air prepared by the compressed air system can be automatically controlled by the pressure signal to control the air supply amount and pressure of the compressed instrument air, and according to the nitrogen flow of the downstream nitrogen production system, the main machine and standby system of the nitrogen production system are automatically closed and opened to maintain the stability of the system.

[0046] The above technical solution has the following beneficial effects: reducing human operation errors through automatic control, improving system operation efficiency; enhancing system stability, automatically adjusting and responding to changes, maintaining the continuity of nitrogen supply; standby nitrogen production components and self-adjusting valves ensure seamless switching when the main system fails, ensuring continuous gas supply and improving system reliability; reducing maintenance cost, the automatic and monitoring functions of the system simplify the maintenance work, reduce the maintenance cost and downtime.

[0047] The specific embodiment of the above utility model further details the purpose, technical solution and beneficial effects of the utility model, and it should be understood that the above content is only a specific embodiment of the utility model and does not limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A low dew point intelligent air nitrogen system, characterized in that, It comprises: an air compression assembly for providing compressed air; a pretreatment assembly connected to the air outlet end of the air compression assembly for purifying and drying the compressed air; a nitrogen production assembly connected to the air outlet end of the pretreatment assembly for producing nitrogen; a gas delivery pipeline connected to the air outlet end of the nitrogen production assembly and having an air inlet end for connecting to a gas supply device; a delivery regulator provided on the gas delivery pipeline.

2. The low-dew-point intelligent air and nitrogen system according to claim 1, wherein: the nitrogen production assembly comprises at least two assemblies, one of which is a running nitrogen production assembly and the other is a standby nitrogen production assembly.

3. The low-dew-point intelligent air and nitrogen system according to claim 2, wherein: a standby machine control module is electrically connected to the running nitrogen production assembly and the standby nitrogen production assembly, and is used to start the standby nitrogen production assembly when the required flow rate is greater than a preset flow rate.

4. The low dew point intelligent air nitrogen system according to claim 1, wherein, It further comprises: a self-regulating valve provided on a detection pipeline in the gas delivery pipeline and used for pressure stabilization.

5. The low dew point intelligent air nitrogen system according to claim 1, wherein, It further comprises: a feedback regulation assembly: the feedback regulation assembly comprises a pressure gauge and an automatic controller; the pressure gauge is provided on a pipeline at the air outlet end of the pretreatment assembly and is used to measure air pressure; the automatic controller is electrically connected to the pressure gauge, an air inlet valve of the nitrogen production assembly and the air compression assembly, and is used to control the air inlet valve to be closed and the compression force of the air compression assembly to be increased when the air pressure detected by the pressure gauge is lower than a predetermined air pressure.

6. The low-dew-point intelligent air and nitrogen system according to claim 1, wherein: the air compression assembly comprises an air compressor and a compressed air storage tank.

7. The low-dew-point intelligent air and nitrogen system according to claim 1, wherein: the pretreatment assembly comprises a high-temperature combined dryer and a filter group.

8. The low dew point intelligent air nitrogen system of claim 1, wherein, It further comprises: an instrument control interlock connected to each assembly and used to control each assembly.

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