A cooling water replenishing system based on a combined filter, with metering and diagnosis

Abstract

The utility model discloses a kind of cooling water replenishing system based on combination filter, with metering and diagnosis, including water inlet main, water outlet main and three or more than three valveless filter connected in parallel between water inlet main and water outlet main, the water inlet end of each described valveless filter is respectively provided with water inlet flowmeter and pressure gauge, and water outlet flowmeter is provided on the water outlet main.The utility model realizes simple and accurate metering and diagnosis to system at very low cost on the basis of ensuring the continuous supply of cooling water in circulating pool when backwashing or overhauling by the parallel connection mode of multiple combination filter.

Description

Technical Field

[0001] This utility model relates to the field of circulating cooling water supply engineering technology, specifically to a cooling water makeup system based on a combined filter bed that also has metering and diagnostic functions. Background Technology

[0002] Traditional water treatment devices are expensive, so valveless filters have significant economic advantages, such as low price and no power required for operation.

[0003] Conventional valveless filters typically operate in pairs, sharing a distribution tank and running simultaneously. Backwashing requires shutting down both filters and using their stored water to rinse the filter sand. They also cannot be operated during maintenance. However, in actual circulating cooling water projects, accurate metering and continuous cooling water replenishment are crucial. This invention proposes a parallel arrangement of multiple combined filters, using a gravity drainage system with three filters in parallel as a typical example. The parallel arrangement of three valveless filters (2 in operation, 1 in standby) is the preferred solution for improving reliability in replenishment scenarios. However, since each filter operates independently, load balancing and energy-saving optimization cannot be achieved at the system level. Therefore, there is an urgent need for a replenishment system capable of diagnosing the current status of each filter and implementing coordinated management to further reduce operating costs.

[0004] When valveless filter effluent is used for circulating water replenishment, its overflow is a gravity flow, which is prone to incomplete filling of the pipe, leading to measurement distortion by the electromagnetic flowmeter. Furthermore, after long-term operation, the instrument's accuracy drifts and cannot be verified online. Traditional solutions require the addition of an intermediate water tank and pump, with the flowmeter installed after the pump, resulting in increased equipment investment, complex maintenance, and decreased system reliability. Therefore, developing a simple metering method that requires no additional power equipment is of significant value in reducing costs and improving operational efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a cooling water replenishment system based on a combined filter, which can ensure long-term stable water replenishment to the circulating water tank, effectively and accurately measure the water, diagnose the condition of the filter media in the early stage, and achieve coordinated and optimized operation of multiple filter tanks.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A cooling water makeup system based on a combined filter bed, which also has metering and diagnostic functions, includes an inlet main pipe, an outlet main pipe, and three or more valveless filter beds connected in parallel between the inlet main pipe and the outlet main pipe. Each valveless filter bed is equipped with an inlet flow meter and a pressure gauge at its inlet end, and an outlet flow meter is installed on the outlet main pipe.

[0008] Preferably, the height difference between the beginning and end of the main outlet pipe is greater than the total head loss of the pipeline.

[0009] Preferably, a venting well is provided at the highest point of the main water outlet pipe.

[0010] Furthermore, the top of the ventilation well is elbow-shaped.

[0011] Preferably, the inlet flow meter is a portable clamp-on ultrasonic flow meter.

[0012] Preferably, the outlet flow meter is an electromagnetic flow meter.

[0013] This invention ensures a continuous supply of cooling water in the circulating tank during backwashing or maintenance by connecting multiple combined filter tanks in parallel. Furthermore, it achieves simple and accurate metering and diagnosis of the system at extremely low cost.

[0014] In a preferred embodiment of this utility model, the elevation design of the main outlet pipe ensures that the height difference ΔH between its starting end and the inlet of the terminal circulating water pool is always greater than the total head loss ∑hf of the pipeline, fundamentally eliminating non-full pipe flow and creating a prerequisite for accurate metering.

[0015] In a preferred embodiment of this invention, the traditional single exhaust function is changed to a combination of exhaust and replenishment functions through a venting manhole, thereby maintaining stable pipeline pressure. Attached Figure Description

[0016] Figure 1 This is a simplified schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a plan view of the present invention.

[0018] Figure 3 This is a frontal view of the present invention.

[0019] In the diagram: 1. Inlet flow meter; 2. Pressure gauge; 3. Outlet flow meter; 4. Vent pipe well. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments will provide a more detailed description of this utility model.

[0021] This embodiment takes the valveless filter system implemented in the two 30,000 cubic meter air separation units newly built in the Nanchang Hangzhou Oxygen Plant supporting Fangda Special Steel project as an example. Figure 1-3 As shown, the system includes an inlet main pipe, an outlet main pipe, and three valveless filter tanks connected in parallel between the inlet main pipe and the outlet main pipe, referred to as filter tank #1, filter tank #2, and filter tank #3, respectively. Each filter tank has an inlet flow meter and a pressure gauge installed on its inlet pipe, and its outlet is connected to the outlet main pipe, on which an outlet flow meter is installed.

[0022] The accurate measurement and diagnosis of this invention rely on full-pipe flow. Therefore, this invention introduces a full-pipe flow guarantee for the main outlet pipe based on the principle of high elevation difference. Specifically, a hydraulic calculation model for full-pipe flow in a multi-filter system is established to clarify the influence of key parameters (flow velocity, pipe diameter, and pipe fitting resistance) on head loss. The overall elevation of the main outlet pipe is designed to ensure that the elevation difference ΔH between its starting end and the inlet of the terminal circulating water tank is always greater than the total head loss ∑hf of the pipeline, fundamentally eliminating non-full-pipe flow and creating a prerequisite for accurate measurement.

[0023] In this embodiment, precise calculations determined that the starting end of the main outlet pipe must be 0.7 meters higher than the terminal end (ΔH = 0.7m), which is greater than the calculated total head loss of 0.5m (∑hf = 0.5m). Since the combined filter tanks are generally supplied as a complete set by the manufacturer, and the main outlet pipe is horizontal without slope, a sufficient geometric height difference ΔH can be artificially created at the oblique joint of the main outlet pipe. This utilizes gravitational potential energy to overcome frictional and local losses along the pipe flow path. That is, ΔH > ∑hf (total head loss) is ensured. This ensures that the main outlet pipe is always filled with water and maintains a certain residual pressure, fundamentally eliminating non-full pipe flow and eddies.

[0024] Furthermore, at the highest point of the outlet pipe, air can easily accumulate, creating air resistance, or negative pressure can be generated when the flow rate changes, disrupting the full-pipe flow pattern and affecting the accuracy of the flow meter. Additionally, backwashing of multiple filter beds or valve opening and closing can cause drastic fluctuations in the total pipe flow rate, resulting in water hammer or severe pressure changes, affecting the stability of the flow meter's instantaneous readings. This invention incorporates an integrated venting manhole at the highest point of the pipeline, transforming the traditional single venting function into a combined venting and replenishment function, maintaining stable pipeline pressure.

[0025] In this embodiment, the aforementioned oblique joint can theoretically be considered the physical highest point of the main outlet pipe, and theoretically, a vent pipe or exhaust valve should be installed there. This embodiment designs an integrated vent manifold, which is installed vertically, with its bottom connected to the main pipe and its top exceeding the highest water level in the clear water zone of the filter tank. It also features two 90° bends, making the vent manifold an inverted J-shaped bend. The main functions of the vent manifold are: a) to continuously remove accumulated air; b) to automatically draw in air when the pressure inside the pipe is lower than atmospheric pressure, preventing the formation of a negative pressure vacuum and protecting the pipes and instruments; and c) to maintain the pressure inside the pipe close to atmospheric pressure, creating a stable measurement environment.

[0026] In this embodiment, a precise metering method with a "dual-core" approach is adopted.

[0027] Main metering: A high-precision electromagnetic flow meter is installed on the main outlet pipe of the multi-filter tank, and the flow signal is remotely fed back to the control room;

[0028] Auxiliary calibration: Install a portable clamp-on ultrasonic flow meter and pressure gauge on each inlet pipe of a single filter bed, and remotely feed the flow and pressure signals back to the control room;

[0029] The recorded parameters are compared online to enable online calibration without interrupting production. A calibration alarm is issued as soon as a data deviation exceeds the limit.

[0030] Electromagnetic flow meters require full-pipe measurement, offer high accuracy, have no moving parts, and boast extremely high reliability. Portable ultrasonic flow meters, with their clamp-on installation, do not damage the pipeline, but their metering reliability is lower than that of electromagnetic flow meters, and their price is relatively lower; therefore, they are used for auxiliary calibration. During stable system operation, i.e., after backwashing and when the filter is in the initial filtration stage, with filters #1 and #2 operating and filter #3 in standby (2 in operation, 1 in standby), record the influent flow rate Q1 of filter #1. in Inlet water pressure P1 in The influent flow rate Q2 of filter bed #2 in Inlet water pressure P2 in The total outflow is recorded as Q. out .

[0031] This "decentralized influent metering + pressure measurement + centralized effluent metering" model, while unable to directly obtain the precise effluent from a single filter, can yield many valuable system-level conclusions through data analysis and comparison:

[0032] a) When Q out ≈Q1 in +Q2 in If the system is functioning properly and there are no leaks, it indicates that the system is intact and there are no leaks.

[0033] b) When Q out Q1 in +Q2 in If the value is significantly greater than 1, it indicates that there may be an unknown water source injected into the system, or that the system may be incorrectly connected. In this case, an alarm should be triggered and the system checked.

[0034] c) When Q out <Q1 in +Q2 in If the flow rate is significantly less than the total flow meter, it indicates that there may be a leak inside the filter or in the connecting pipes, causing water to be lost before it fully passes through the total flow meter. It may also indicate that the flow meter is inaccurate. In this case, an alarm should be triggered and the flow meter checked.

[0035] d) When Q out It has remained stable, while Q1 in and Q2 in If the value differs significantly from the previous value, it indicates that the filter may be severely clogged or short-circuited, and an alarm should be triggered for inspection.

[0036] e) When Q1 in Decrease, while P1 in If the flow rate increases or remains unchanged, it indicates that the internal flow resistance of the filter bed has increased, i.e., the filter layer is blocked. In this case, an alarm should be triggered for inspection.

[0037] f) When Q1 in Decrease, while P1 in If the water level drops, it indicates that the filter media in the filter bed is not the problem, but rather that the problem lies with the upstream water inlet distribution system. In this case, an alarm should be triggered and the system checked.

[0038] This invention installs a set of low-cost and easy-to-use flow meters and pressure gauges at the inlet of each filter bed. By integrating real-time data on inlet flow and pressure, a dynamic health assessment model based on individual performance baselines is constructed. This enables accurate tracing and early warning of problems such as filter bed blockage and inlet failure. When the system alarms, maintenance personnel can directly bring cleaning equipment to the filter bed based on historical diagnostic reports, eliminating the need for individual inspections and saving significant manpower and resources.

[0039] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cooling water makeup system based on a combined filter bed, incorporating both metering and diagnostic functions, characterized in that: It includes an inlet main pipe, an outlet main pipe, and three or more valveless filter tanks connected in parallel between the inlet main pipe and the outlet main pipe. Each valveless filter tank is equipped with an inlet flow meter and a pressure gauge at its inlet end, and an outlet flow meter is installed on the outlet main pipe.

2. The cooling water makeup system based on a combined filter bed and possessing both metering and diagnostic functions according to claim 1, characterized in that, The height difference between the beginning and end of the main outlet pipe is greater than the total head loss of the pipeline.

3. A cooling water makeup system based on a combined filter bed and possessing both metering and diagnostic functions, as described in claim 1, is characterized in that... A venting well is located at the highest point of the main water outlet pipe.

4. A cooling water makeup system based on a combined filter bed and possessing both metering and diagnostic functions, as described in claim 3, is characterized in that... The top of the ventilation well is inverted J-shape.

5. A cooling water makeup system based on a combined filter bed and possessing both metering and diagnostic functions, as described in claim 1, is characterized in that... The inlet flow meter is a portable clamp-on ultrasonic flow meter.

6. A cooling water makeup system based on a combined filter bed and possessing both metering and diagnostic functions, as described in claim 1, is characterized in that... The outlet flow meter is an electromagnetic flow meter.

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