Online composite air cooler water tank liquid level and salt content comprehensive control system

Abstract

The utility model discloses an on-line composite air cooler water tank liquid level and salt content comprehensive control system which comprises a water tank connected with a liquid level meter and a conductivity detector through pipelines. The water inlet end of the water tank is connected with a water inlet pipeline, two stop valves are arranged on the water inlet pipeline, the water inlet pipeline between the two stop valves is connected with an adjusting valve, and the adjusting valve is connected with a liquid level meter through a pipeline so as to be used for liquid level control; a drainage end of the water tank is connected with a drainage pipeline, the drainage pipeline is connected with a stop valve and an interlocking stop valve, the interlocking stop valve is connected with a conductivity detector, when the conductivity in water in the water tank exceeds the standard, the interlocking stop valve is opened for replacement, and the interlocking stop valve is closed after the conductivity is reduced to a normal range, so that the liquid level of the water tank and the regulating valve can be automatically controlled; when the salt content in the water tank exceeds the standard, the outlet stop valve is automatically opened for replacement, equipment corrosion caused by the fact that the salt content in the water exceeds the standard is avoided, and the replacement effect is improved.

Description

Technical Field

[0001] This utility model relates to a liquid level control system for a composite air cooler water tank, and more specifically, to an online integrated control system for liquid level and salinity of a composite air cooler water tank, belonging to the petrochemical field. Background Technology

[0002] The combined air cooler is a crucial component of the hydrogenation unit, utilizing the latent heat of water and the sensible heat of air to dissipate heat from the medium. It boasts high heat exchange efficiency and a small footprint. Currently, the water replacement method for the combined air cooler in hydrocracking is manual and periodic, using a float valve to control the liquid level system. This method presents the following problems: excessive chloride ions in the water can cause corrosion of the water-cooled section tube bundles, shortening the service life of the combined air cooler; salt corrosion on the air-cooled section tube bundle fins leads to decreased heat exchange efficiency; in severe cases, it may cause under-scale corrosion and leakage; the float valve is prone to wear and leakage, which can lead to a full water tank level, demineralized water overflow, and resource waste; and the water level in the tank falling below the inlet of the circulating water pump can cause the pipeline pump to run dry. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides an online integrated control system for the water tank level and salt content of a composite air cooler. This system features automatic control of the water tank level and regulating valve, remote transmission of the on-site water level to the DCS, prevention of pump cavitation and overflow at full level, automatic opening of the outlet shut-off valve for replacement when the salt content in the water tank exceeds the standard, and automatic closing of the valve after the salt content decreases to the normal level, thus preventing equipment corrosion caused by excessive salt in the water, improving the replacement effect, and saving replacement water.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] This utility model discloses an online integrated control system for the liquid level and salinity of a composite air cooler water tank, including a water tank, which is connected to a liquid level gauge and a conductivity detector via pipelines.

[0006] The water tank is connected to an inlet pipeline at its inlet end. Two shut-off valves are installed on the inlet pipeline, and a regulating valve is connected to the inlet pipeline between the two shut-off valves. The regulating valve is connected to a level gauge through a pipeline for level control.

[0007] The water tank is connected to a drain pipe, and a shut-off valve and an interlock shut-off valve are connected to the drain pipe. The interlock shut-off valve is connected to a conductivity detector. When the conductivity of the water in the tank exceeds the standard, it will be opened interlocked to replace the water. When the conductivity drops to the normal range, it will be closed interlocked.

[0008] Preferably, the two shut-off valves on the inlet pipeline are connected in parallel to an inlet secondary pipeline, and a secondary valve is connected to the inlet secondary pipeline.

[0009] Preferably, the level gauge is connected to a DCS system to remotely transmit the on-site liquid level to the DCS system.

[0010] Preferably, the regulating valve on the water inlet pipeline and the shut-off valve on the drainage pipeline both use a 2-out-of-3 switch control signal.

[0011] Beneficial effects: It can realize automatic control of water tank level and regulating valve, transmit the on-site water level to DCS, avoid the on-site water pump cavitation and overflow when the water level is full. When the salt content in the water tank exceeds the standard, the outlet shut-off valve will automatically open to replace it. After the salt content is reduced to the normal index, it will automatically close, avoiding equipment corrosion caused by excessive salt in the water, improving the replacement effect, and saving replacement water. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not 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 effort are within the protection scope of the present utility model.

[0014] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] Scope of application and application prospects: This invention is applicable to all composite air-cooled water tanks in hydrogenation units. Composite air coolers have excellent cooling effects, but the water tank is a closed demineralized water circulation system. After long-term operation, the salt content in the circulating water is prone to increase, leading to equipment corrosion. Therefore, it is essential to add conductivity monitoring to the circulating water tank and replace it regularly.

[0017] like Figure 1 The illustration shows a specific embodiment of an online integrated control system for the water level and salinity of a composite air cooler water tank. This embodiment features a water tank 1, which is connected to a level gauge 2 and a conductivity detector 3 via pipelines. The water tank 1 has an inlet pipeline 4 connected to its inlet end, with two shut-off valves installed on the inlet pipeline 4. A regulating valve is connected to the inlet pipeline 4 between the two shut-off valves, and the regulating valve is connected to the level gauge 2 via a pipeline for level control. The water tank 1 has a drain pipeline 5 connected to its drain end, with a shut-off valve and an interlocking shut-off valve connected to the drain pipeline 5. The interlocking shut-off valve is connected to the conductivity detector 3. When the conductivity of the water in the water tank 1 exceeds the standard, it interlocks to open for replacement; when the conductivity drops to the normal range, it interlocks to close.

[0018] Water tank 1: Used to store circulating water, and connected to level gauge 2 and conductivity detector 3 via pipeline.

[0019] Level gauge 2: Real-time detection of the liquid level in water tank 1 and transmission of the signal to the DCS system for remote monitoring.

[0020] Conductivity detector 3: detects the conductivity of water in water tank 1, and sends a signal to the interlock shut-off valve when the conductivity exceeds the standard.

[0021] Water inlet pipeline 4: Connected to the water inlet of water tank 1, the pipeline is equipped with two shut-off valves (not marked in the figure) and one regulating valve. The regulating valve automatically adjusts the water inlet flow according to the signal from level gauge 2, thereby controlling the water level in water tank 1.

[0022] Drainage line 5: Connected to the drain end of water tank 1, the line is equipped with a shut-off valve and an interlock shut-off valve. When the conductivity detector 3 detects that the conductivity exceeds the standard, the interlock shut-off valve automatically opens to replace the conductivity, and automatically closes after the conductivity drops to the normal range.

[0023] Secondary inlet pipeline: A secondary inlet pipeline is connected in parallel between the two shut-off valves of the secondary inlet pipeline 4. The secondary pipeline is equipped with a secondary valve to provide a backup inlet channel when needed.

[0024] Two-out-of-three control signals: The regulating valve on the inlet pipeline 4 and the shut-off valve on the drain pipeline 5 both use two-out-of-three control signals to improve the reliability and safety of the system. ("Two-out-of-three" is a redundant control strategy. Its basic principle is to select any two signals from three identical measurement or control signals as valid signals for control decisions. Specifically, for each valve (such as a regulating valve or a shut-off valve), the system is equipped with three independent sensors or signal sources to monitor or control the valve's on / off state. These three signal sources may come from different sensors or be the same sensor signal processed through different paths to ensure signal diversity and independence.)

[0025] Through the above technical solution, this utility model realizes the comprehensive control of the liquid level and salt content of the water tank of the composite air cooler, effectively solves the problems existing in the prior art, and improves the operating efficiency and reliability of the equipment.

[0026] In a preferred embodiment, the two shut-off valves on the inlet pipeline 4 are connected in parallel to an inlet branch pipeline, and a branch valve is connected to the branch pipeline. The level gauge 2 is connected to a DCS system to remotely transmit the on-site liquid level to the DCS system (this is prior art and will not be described in detail here; DCS, short for Distributed Control System, is a more advanced and flexible computer control system than a centralized control system, widely used in industries such as petroleum, chemical, power, metallurgy, papermaking, and pharmaceuticals to monitor and control various complex processes and equipment. Through real-time data acquisition and analysis, the DCS system can help enterprises optimize production processes, improve production efficiency, and reduce energy consumption and costs). The regulating valve on the inlet pipeline 4 and the shut-off valve on the drain pipeline 5 both use a two-out-of-three switching control signal.

[0027] Finally, it should be noted that this utility model is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. An online integrated control system for water tank level and salinity of a composite air cooler, characterized in that, Includes a water tank (1), which is connected to a level gauge (2) and a conductivity detector (3) via a pipeline; The water tank (1) is connected to an inlet pipe (4) at the inlet end. Two shut-off valves are installed on the inlet pipe (4), and a regulating valve is connected on the inlet pipe (4) between the two shut-off valves. The regulating valve is connected to the level gauge (2) through a pipeline for level control. The water tank (1) is connected to a drain pipe (5) at the drain end. A stop valve and an interlock shut-off valve are connected to the drain pipe (5). The interlock shut-off valve is connected to a conductivity detector (3). When the conductivity of the water in the water tank (1) exceeds the standard, it is interlocked to open for replacement. When the conductivity drops to the normal range, it is interlocked to close.

2. The online integrated control system for water tank level and salinity of a composite air cooler according to claim 1, characterized in that, The two shut-off valves on the water inlet pipeline (4) are connected in parallel to the water inlet secondary pipeline, and the water inlet secondary pipeline is connected to the secondary line valve.

3. The online integrated control system for water tank level and salinity of a composite air cooler according to claim 1 or 2, characterized in that, The level gauge (2) is connected to a DCS system to transmit the on-site liquid level to the DCS system.

4. The online integrated control system for water tank level and salinity of a composite air cooler according to claim 1, characterized in that, The regulating valve on the inlet pipeline (4) and the shut-off valve on the drain pipeline (5) both use a 3-out-of-2 switch control signal.

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