Air separation and air compression integrated control device

Abstract

The utility model discloses an air separation and air compression integrated control device, which relates to an industrial control system and comprises an air separation system and an air compression system, and the air separation system comprises a first air filter, an air separation air compressor, a precooler and a fractionation system which are sequentially connected through an air separation pipeline. A pipeline between the air separation air compressor and the precooler is connected and communicated with a branch pipeline, and the branch pipeline is provided with a compressed air processing system; the air compression system comprises an air compression station system and a regulation and control valve which are connected through an air compression main pipe, the tail end of the branch pipeline is communicated with the air compression main pipe, and the connecting position of the branch pipeline and the air compression main pipe is located behind the air outlet end of the regulation and control valve. According to the device, low-efficiency operation of the air compressor in the air separation system is achieved, meanwhile, the overall energy consumption of an air compression station system can be remarkably reduced, and therefore the economic benefit and the energy efficiency level are both improved in the process industrial production link.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial control, in particular to a control device for integrated air separation and air compression. Background Art

[0002] As the fourth largest energy source in the process industry, compressed air is involved in almost all industrial fields, such as: iron and steel, metallurgy, chemical industry, petrochemical industry, chemical fiber, textile, electronics, food, etc. At the same time, compressed air also plays a key role in the oxygen production process. It improves the air pressure, promotes the activity of gas molecules, ensures that the equipment obtains a stable gas source, and improves the oxygen purity after treatment, so as to effectively support the efficient operation of the oxygen production process and reduce energy consumption and costs.

[0003] In the process flow of air separation and oxygen production, the core link is to use high-efficiency large compressors to generate a stable compressed air flow. These compressors, as the key power sources, continuously supply high-pressure gas to ensure that the air separation system can efficiently and continuously carry out in-depth separation and purification operations on a large amount of air. This process not only ensures the continuous and smooth operation of the oxygen production operation, but also greatly improves the efficiency and purity of oxygen production, meeting the needs of various industrial fields for high-quality oxygen supply.

[0004] However, in the current industrial environment, a significant problem is that large air compressors are generally operating inefficiently. Traditional air separation air compressors rely on adjusting the inlet guide vane as the main means to regulate the air flow rate, but this approach often leads to insufficient resource utilization, that is, high-energy-consuming equipment operates at low load, wasting energy and failing to fully utilize the performance potential of the equipment. Summary of the Invention

[0005] In order to solve at least one of the above technical problems, the utility model provides a device that combines an air separation system and an air compression system, realizes the coupled and optimized application of technologies, and improves the overall operation efficiency. The technical solution is as follows:

[0006] A control device for integrated air separation and air compression includes an air separation system and an air compression system. The air separation system includes a first air filter, an air separation air compressor, a precooler, and a fractionation system connected in sequence through an air separation pipeline. A tapping pipeline is connected to the pipeline between the air separation air compressor and the precooler, and a compressed air treatment system is provided on the tapping pipeline.

[0007] The air compression system includes an air compression station system and a regulating valve connected through an air compression main pipe. The end of the tapping pipeline is connected and communicated with the air compression main pipe, and the connection position of the tapping pipeline and the air compression main pipe is located behind the outlet end of the regulating valve.

[0008] As an improved scheme, an oxygen pipeline and a nitrogen pipeline are provided at the outlet end of the fractionation system.

[0009] As an improved solution, the compressed air treatment system includes a regulating valve, a compressed heat dryer, a booster, and a regulating valve connected in sequence through a tapping pipeline. After the air is compressed by the air separation air compressor, a large amount of heat is generated, raising the temperature of the compressed air. The compressed heat dryer utilizes this part of the heat to evaporate and separate the moisture in the compressed air through a specific heat exchange process, thereby achieving air drying.

[0010] As an improved solution, a gas pressure gauge and a gas flow meter are provided on the pipeline between the booster and the regulating valve.

[0011] As an improved solution, a gas flow meter is also provided on the main air compressor pipe, and its installation position is at the rear end of the connection position between the tapping pipeline and the main air compressor pipe.

[0012] As an improved solution, the air compressor station system includes several groups of air compressor sub-modules, and several groups of air compressor sub-modules are connected in parallel through air compressor sub-pipelines.

[0013] As an improved solution, each group of the air compressor sub-modules includes a second air filter, an air compressor, a dryer, and a compressed air storage tank connected in sequence through an air compressor sub-pipeline.

[0014] As an improved solution, the ends of all the air compressor sub-pipelines are connected to the main air compressor pipe.

[0015] As an improved solution, regulating valves are provided on the air compressor sub-pipelines connected to the outlet ends of the second air filter, the air compressor, and the compressed air storage tank.

[0016] The beneficial effects of the present utility model are as follows: By integrating the air separation system and the air compression system, the present utility model realizes the coupling optimization and collaborative operation between the two, so as to give full play to their respective advantages and create better comprehensive performance. While solving the problem of "low-efficiency operation" of the air separation air compressor in the air separation system, it can also significantly reduce the overall energy consumption of the air compressor station system, thereby achieving a double improvement in economic benefits and energy efficiency levels in the process industrial production link. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the air separation and air compression integrated control device disclosed in the embodiment;

[0020] Figure 2 It is a schematic diagram of the structure of the air compressor station system disclosed in the embodiment.

[0021] The reference numerals are: 1, air compression main pipe; 2, air compressor station system; 3, air separation pipeline; 4, first air filter; 5, air separation air compressor; 6, precooler; 7, fractionation system; 801 - 804, regulating valve; 9, compression heat dryer; 10, booster; 11, tapping pipeline; 201, second air filter; 202, air compressor; 203, dryer; 204, compressed air storage tank. Specific embodiments

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model; obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances of the solution.

[0024] (1) Explanation of the structural layout of the first part of the device Please refer to Figure 1

[0025] The specific structure of the air separation and air compression integrated control device is as Figure 1 shown. The device includes an air separation system and an air compression system;

[0026] The air separation system includes a first air filter 4, an air separation air compressor 5, a precooler 6 and a fractionation system 7 connected in sequence through an air separation pipeline 3.

[0027] Among them, the outlet end of the fractionation system 7 is provided with an oxygen pipeline and a nitrogen pipeline. The fractionation system 7 fractionates the purified and deeply cooled compressed air step by step into pure gases such as oxygen and nitrogen. The main equipment of the fractionation system 7 is a cold box. The fractionation system 7 includes a main tower, a main condenser, a subcooler, a crude argon tower, a liquid oxygen pump, a liquid pump, etc. Commercially mature distillation system products can be used and will not be elaborated here.

[0028] A tapping pipeline 11 is connected to the pipeline between the air separation air compressor 5 and the precooler 6, and a compressed air treatment system is provided on the tapping pipeline 11;

[0029] Specifically, the compressed air treatment system includes a regulating valve 801, a compressed heat dryer 9, a booster 10 and a regulating valve 802 connected in sequence through the tapping pipeline 11. After the air is compressed by the air separation air compressor 5, a large amount of heat will be generated, causing the temperature of the compressed air to rise. The compressed heat dryer 9 utilizes this part of the heat to evaporate and separate the moisture in the compressed air through a heat exchange process, thereby realizing the drying of the air.

[0030] The air compressor system includes an air compressor station system 2 and a regulating valve 803 connected through an air compressor main pipe 1. The end of the tapping pipeline 11 is connected and communicated with the air compressor main pipe 1, and the connection position of the tapping pipeline 11 and the air compressor main pipe 1 is located at the rear end of the outlet end of the regulating valve 803.

[0031] As a preferred example, a gas pressure gauge P and a gas flow meter Q are provided on the corresponding pipeline between the booster 10 and the regulating valve 802, which is convenient for users to obtain the air pressure and flow data of the compressed air in the tapping pipeline 11. A gas flow meter Q is provided on the air compressor main pipe 1, and the specific installation position can be placed at the rear end of the corresponding connection position of the tapping pipeline 11 and the air compressor main pipe 1, so as to facilitate obtaining the outlet air volume in the air compressor main pipe 1.

[0032] As Figure 2 shown, the air compressor station system 2 includes several groups of air compressor sub-modules, and several groups of air compressor sub-modules are connected in parallel through air compressor sub-pipelines. Exemplarily, three groups of air compressor sub-modules are provided in this embodiment. Each group of air compressor sub-modules includes a second air filter 201, an air compressor 202, a dryer 203 and a compressed air storage tank 204 connected in sequence through the air compressor sub-pipeline. The ends of each air compressor pipeline are gathered and then connected and communicated with the air compressor main pipe 1, or in other words, the ends of all air compressor pipelines are connected, and the end connection is connected and communicated with the air compressor main pipe 1. Regulating valves 804 are provided on the air compressor sub-pipelines corresponding to the outlet ends of the second air filter 201, the air compressor 202 and the compressed air storage tank 204.

[0033] In this utility model, each regulating valve is used to control or shut off the air flow. The dryer 202 is mainly used to remove moisture from the compressed air, and mature technologies (such as the compressed heat zero-air-consumption dryer on the market) can be adopted.

[0034] (II) Description of the operation method of the second part of the device

[0035] The air enters the high-efficiency operating air separation air compressor 5 after being filtered by the first air filter 4 to produce compressed air. Then, the compressed air flows into the pre-cooler 6 through the air separation pipeline to be cooled and obtain the finished compressed air for the fractionation system 7 to use. In the fractionation system 7, the purified and deeply cooled compressed air is fractionated step by step to obtain pure gases such as oxygen and nitrogen.

[0036] In the air separation system, the air volume generated by the air separation air compressor 5 is generally greater than the air volume required by the fractionation system 7. In actual working conditions, usually only by closing the inlet guide vane can the system operation be maintained. However, closing the guide vane will change the air flow state inside the air separation air compressor 5, causing more friction and eddy current losses when the air flows through the air separation air compressor 5. This will lead to a reduction in the compression efficiency of the air separation air compressor 5 and a decrease in the compressed air volume output under the same input power. For example, in the normal operating state, the efficiency of the air separation air compressor 5 is 80%. After closing the guide vane to reduce the air output, its compression efficiency may drop to 70% or even lower.

[0037] In the air compressor station system 2, the air enters three groups of air compressor sub-modules respectively. In the air compressor sub-modules, the compressed air obtained after the air is filtered by the second air filter 201, compressed by the air compressor 202, and dried and dewatered by the dryer 203 enters the compressed air storage tank 204 for buffering. After buffering, the compressed air with a pressure of about 7 bar finally flows into the air compressor main pipe 1.

[0038] In the structural design of this device, in the absence of emergencies, the air separation air compressor 5 always operates efficiently. When there is a situation where the air output of the air separation air compressor 5 is excessive, first open the regulating valve 801, and the compressed air passes through the regulating valve 801 and flows into the compressed air treatment system through the tapping pipeline 11. In the compressed air treatment system, the compressed air is first dried by the compressed heat dryer 9, and then the dried compressed air is pressurized by the booster 10. The compressed air with a pressure of about 8 bar is input into the air compressor main pipe 1 through the regulating valve 802 and is mixed with the compressed air produced in the air compressor station system 2 as the raw material compressed air for various scenarios in process industries. At the same time, by monitoring the gas flow meters installed on the tapping pipeline 11 and the air compressor main pipe 1, the current compressed air flow data can be accurately read.

[0039] Since compressed air in process industry plants is usually transported through a unified main pipe, on the basis of ensuring that the required amount of compressed air for on-site operations is fully met, users can flexibly shut down some of the air compressor sub-modules in the air compressor station system 2. This strategy not only optimizes energy distribution and utilization efficiency but also significantly reduces the overall energy consumption of the air compressor station system, thus achieving a dual improvement in economic benefits and energy efficiency levels in the production process.

Claims

1. A control device for integrated air separation and air compression, characterized in that, It includes an air separation system and an air compressor system. The air separation system includes a first air filter, an air separation air compressor, a precooler and a fractionation system connected in sequence through an air separation pipeline; a tapping pipeline is connected to the pipeline between the air separation air compressor and the precooler, and a compressed air treatment system is provided on the tapping pipeline. The air compressor system includes an air compressor station system and a regulating valve connected through an air compressor main pipe. The end of the tapping pipeline is connected and communicated with the air compressor main pipe, and the connection position of the tapping pipeline and the air compressor main pipe is located at the rear end of the air outlet end of the regulating valve.

2. The control device for integrated air separation and air compression according to claim 1, characterized in that An oxygen pipeline and a nitrogen pipeline are provided at the air outlet end of the fractionation system.

3. The control device for integrated air separation and air compression according to claim 1, characterized in that, The compressed air treatment system includes a regulating valve, a compressed heat dryer, a booster and a regulating valve connected in sequence through the tapping pipeline.

4. The control device for integrated air separation and air compression according to claim 3, characterized in that A gas pressure gauge and a gas flow meter are provided on the pipeline between the booster and the regulating valve.

5. The control device for integrated air separation and air compression according to claim 1, wherein A gas flow meter is also provided on the air compressor main pipe, and its installation position is located at the rear end of the connection position of the tapping pipeline and the air compressor main pipe.

6. The control device for integrated air separation and air compression according to claim 1, wherein, The air compressor station system includes several groups of air compressor sub-modules, and several groups of air compressor sub-modules are connected in parallel through air compressor sub-pipelines.

7. The control device for integrated air separation and air compression according to claim 6, characterized in that, Each group of the air compressor sub-modules includes a second air filter, an air compressor, a dryer and a compressed air storage tank connected in sequence through the air compressor sub-pipeline.

8. The control device for integrated air separation and air compression according to claim 7, wherein The ends of all the air compressor sub-pipelines are connected to the air compressor main pipe.

9. The control device for integrated air separation and air compression according to claim 8, characterized in that, Regulating valves are provided on the air compressor sub-pipelines connected to the outlet ends of the second air filter, the air compressor and the compressed air storage tank.

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