Cooling wall water pipe online leakage detection method based on water quality detection
By installing a water quality detector and solenoid valve on the cooling wall of the blast furnace, the water quality difference is used to determine the damage to the water pipe, which solves the problems of slow leakage check speed and frequent closing of the inlet and outlet valves in the existing technology, and achieves efficient and safe water pipe damage detection and position.
Patent Information
- Application Number
- CN202411310314.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2024-12-13
AI Technical Summary
The existing blast furnace cooling wall water pipe leak check method is slow and inefficient. Frequent closing of water inlet and outlet valves may damage the normal water pipes, resulting in accelerated damage, which is time-consuming and has safety risks.
Using the online leak detection method based on water quality detection, by installing a water quality detector and solenoid valve on the water inlet main pipe and outlet branch pipe of the blast furnace cooling wall, the PLC controller periodically opens and closes the solenoid valve, detects the difference in water quality inlet and outlet to determine the damage to the water pipe, and reduces the Manual intervention and automated discrimination.
The online identification of cooling wall water pipes is realized, the leakage check efficiency is improved, the time is shortened, the damage to normal water pipes is reduced, and the manpower and safety risks are reduced.
Smart Images
Figure CN119124503A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of blast furnace equipment maintenance methods, and in particular to an online leakage detection method for cooling wall water pipes based on water quality detection. Background Art
[0002] The blast furnace cooling stave is a cooling device installed along the height of the blast furnace between the steel shell and the refractory lining of the blast furnace. It is equipped with water pipes and cooling water. Its function is to cool the refractory lining of the blast furnace and prevent the high heat flow in the furnace from causing deformation and cracking of the furnace shell.
[0003] Most blast furnaces now have abandoned the previous open-circuit cooling method of using industrial water in each cooling unit, and instead adopted a soft water closed-circuit cooling system that consumes less new water and is not prone to scaling. It is composed of cooling walls set at the same height of the blast furnace and distributed around the furnace body as a section, and the upper and lower sections are connected in series, and the cooling walls connected in series from bottom to top are a row. A blast furnace is usually composed of several cooling water pipes. In each section, each cooling wall usually contains 4-7 cooling water pipes, and the cooling water flows from bottom to top to cool the entire blast furnace. In a long-term high-temperature working environment, especially in the later stage of the furnace campaign, the cooling wall is severely damaged, and the leaking parts must be found out promptly and accurately and repaired in time.
[0004] The common leak detection methods are: 1. When the liquid level in the expansion tank of the blast furnace soft water circulation cooling system drops too quickly and the water replenishment becomes abnormal, the water engineer closes the inlet and outlet valves of a certain column of water pipes one by one and observes the water pressure gauges at the inlet and outlet ends. When the water pressure is lower than the normal water pressure and close to the furnace pressure, it can be preliminarily determined that the column of water pipes is damaged.
[0005] 2. Usually, the exhaust valve at the top of the closed section of the water pipe is opened, and when the water is drained and gas is emitted, it is ignited. When it catches fire, it can be determined that the row of water pipes is damaged.
[0006] 3. Check the confirmed damaged pipes section by section. Usually, close the inlet and outlet water valves of the suspected cooling wall, open the exhaust valve on the cooling wall section, and ignite it when the water is drained and gas is emitted. The fire can determine that the water pipe of the cooling wall section is damaged.
[0007] 4. For cooling wall water pipes that are confirmed to be damaged, reduce the water pressure and switch to industrial water. If the leakage is confirmed to be large, it is usually sealed.
[0008] 5. Take advantage of the opportunity of blast furnace shutdown for maintenance to thread the damaged cooling wall water pipes or fill them with grout to completely block them. Summary of the invention
[0009] The technical problem to be solved by the present invention is that the existing leak detection method is slow and inefficient, and the inlet and outlet valves of the cooling water pipe to be detected must be frequently closed during the leak detection process, which is equivalent to partially interrupting its cooling, and is easy to damage the normally working water pipe, thereby accelerating its damage. It usually takes about 2 hours from discovering the abnormal water replenishment to finding the specific leaking location, and multiple people collaborate.
[0010] To solve the above problems, the technical solution adopted by the present invention is as follows: The present invention is an online leak detection method for cooling wall water pipes based on water quality detection, comprising the following steps: Step 1: Lead out an inlet water quality detection pipe from the blast furnace cooling wall water inlet main pipe and install an inlet water online water quality detector; Step 2: installing a plurality of electromagnetic valves for drawing out part of the drainage water on each outlet branch pipe of the uppermost cooling wall of the blast furnace; Step 3: All the outlet water of the solenoid valve is collected into a drainage water quality detection tube, on which a drainage online water quality detector is installed; Step 4: The solenoid valve of each branch pipe for leading out part of the drainage of the uppermost cooling wall of the blast furnace is normally closed, controlled by a PLC controller or other controller, and is periodically opened and closed after a period of time; Step 5, identifying possible damaged cooling wall water pipes by comparing the water quality data detected by each outlet branch pipe with the water quality data of the water inlet main pipe; Step 6: The water quality indicators used to determine leaks are conductivity, pH value and TDS; Step seven, after determining the specific damaged pipe number based on the difference between the drainage water quality and the inlet water quality, the exhaust valves of the cooling wall water pipes in the corresponding sections can be opened step by step to drain the water, and then the drainage water quality of the section can be tested using a portable water quality detector. The specific damaged section can be determined based on the difference between the drainage water quality and the inlet water quality of each section.
[0011] Furthermore, the step four is periodically opened and closed in sequence for 0.5-10 minutes.
[0012] Furthermore, the judgment method in step five may be performed manually, or a related computer program may be designed to realize automatic judgment and prompting.
[0013] Furthermore, the water quality index used to determine the leak detection in step 6 may be one or more of conductivity, pH value and TDS index.
[0014] Under normal working conditions, the water in the cooling wall water pipe is isolated from the gas in the blast furnace, and the water quality of its inlet and outlet water will not change significantly; however, when the cooling wall water pipe is damaged and leaking, the cooling water at the leaking part will come into direct contact with the gas and charge in the blast furnace, and some of the water-soluble gases such as NH3, SO2, CO2, etc. will dissolve in the water and partially enter the drainage pipe, and some of the dust in the furnace will also be brought into the drainage pipe, causing the drainage water quality behind the damaged part to change. Therefore, by testing the drainage water quality of each cooling wall water pipe and comparing it with the inlet water quality, it can be determined which specific water pipe is damaged based on the difference in the inlet and outlet water quality data of each cooling wall water pipe. Since there are many water pipes in the cooling wall of a blast furnace, in order to avoid the problem of high investment cost and difficult maintenance caused by installing too many online detection instruments, only the solenoid valve and corresponding pipeline for extracting water samples are installed at the drainage end of each water pipe of the top cooling wall of the blast furnace, and a set of online water quality detectors are used for many cooling wall drainage branches. The solenoid valves on the drainage end of the water pipes of the top cooling wall of the blast furnace are controlled by a programmable controller (PLC) or other controllers, and are opened and closed after a period of time. The online water quality detector for the water inlet of the cooling wall is installed on the water inlet main of the cooling wall. The difference between the drainage water quality and the inlet water quality of each water pipe of the top cooling wall detected by the online water quality detector can be used to find out the possible broken water pipes.
[0015] The beneficial effects achieved by the present invention using the above structure are as follows: 1. Online identification of damaged cooling wall water pipes can be achieved, eliminating the need to manually go to dangerous areas to frequently open and close water inlet and outlet valves to identify whether the water pipes are damaged, thereby greatly improving efficiency, saving manpower and reducing safety risks.
[0016] 2. It can greatly shorten the time required for cooling wall water pipe leak detection, and even provide real-time alarms and prompts with the help of computer programs.
[0017] 3. It can greatly reduce the damage to the normal cooling wall water pipes caused by leak detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A schematic diagram of a system for an online cooling wall water pipe leak detection method based on water quality detection proposed by the present invention; Among them, 1. Inlet water online water quality detector, 2. Drainage water online water quality detector, 3. Solenoid valve, 4. PLC controller, 5. Inlet water quality detection tube, 6. Drainage water quality detection tube. DETAILED DESCRIPTION
[0019] As the instruction manual Figure 1 As shown, the present invention is an online leakage detection method for cooling wall water pipes based on water quality detection. Example 1
[0020] A large blast furnace adopts soft water closed circulation cooling. There are 14 cooling walls from the furnace to the top of the furnace body, with a total of 168 cooling water pipes. The water supply method adopts the method of connecting in series from bottom to top. Figure 1 Only four cooling water pipes are shown in the figure. The leak detection method is as follows: Step 1, determining the pipe number of the damaged cooling wall. The solenoid valve (3) on each drainage pipe of the uppermost cooling wall is controlled by a PLC controller (4) or other controller to cycle open and close in sequence. The drainage of each cooling wall water pipe enters the drainage water quality detection pipe in sequence and is detected by the drainage online water quality detector, such as conductivity, pH value, TDS, etc. The data detected by each cooling wall drainage pipe is compared with the data detected by the inlet water online water quality detector (1) installed on the inlet water quality detection pipe (5). The drainage pipe number with the largest difference can be found, and the pipe number can be determined as the damaged cooling wall water pipe number. This step can be determined manually, or a related computer program can be designed to realize automatic determination. Step 2: Determine the leaking section of the damaged cooling wall. After the pipe number of the damaged cooling wall is determined, the exhaust valves on the water pipes of each section of the cooling wall on the pipe number can be opened from top to bottom to drain the water, and a portable water quality detector can be used to detect the water quality indicators of the drainage of each section of the cooling wall on the pipe number. The data is compared with the data detected by the inlet online water quality detector (1), and the section number closest to the data detected by the inlet online water quality detector (1) is gradually found. Then the cooling wall above this section of the cooling wall can be determined as a leaking section; Step 3: Confirm the damaged cooling wall, close the upper and lower water inlet and outlet valves on the cooling wall of the leaking water pipe section, and open the exhaust valve on the water pipe of the cooling wall section, and ignite and confirm after draining the water; Step 4: After the problem is found, the water supply can be restored and the pipes can be pierced or other repairs can be performed when the time is right. Example 2
[0021] A cooling wall water pipe online leak detection method based on water quality detection comprises the following steps: Step 1: Lead out an inlet water quality detection pipe (5) from the blast furnace cooling wall water inlet main pipe and install an inlet water online water quality detector (1); Step 2: installing a plurality of solenoid valves (3) for drawing out part of the water on each water outlet branch pipe of the uppermost cooling wall of the blast furnace; Step 3: All the outlet water of the solenoid valve (3) is collected into a drainage water quality detection tube (6), and a drainage online water quality detector (2) is installed on the drainage water quality detection tube (6); Step 4: the solenoid valve (3) of each branch pipe for leading out part of the drainage of the uppermost cooling wall of the blast furnace is normally closed and controlled by the PLC controller (4) or other controller to be opened in a cycle in sequence and closed after being opened for 5 minutes; Step 5: Identify possible damaged cooling wall water pipes by comparing the water quality data detected by each outlet branch pipe with the water quality data of the inlet main pipe. This can be done manually or by designing a related computer program to achieve automatic identification and prompting. Step 6: The water quality indicators used to determine leaks are conductivity, pH value and TDS; Step seven, after determining the specific damaged pipe number based on the difference between the drainage water quality and the inlet water quality, the exhaust valves of the cooling wall water pipes in the corresponding sections can be opened step by step to drain the water, and then the drainage water quality of the section can be tested using a portable water quality detector. The specific damaged section can be determined based on the difference between the drainage water quality and the inlet water quality of each section. Example 3
[0022] A cooling wall water pipe online leak detection method based on water quality detection comprises the following steps: Step 1: Lead out an inlet water quality detection pipe (5) from the blast furnace cooling wall water inlet main pipe and install an inlet water online water quality detector (1); Step 2: installing a plurality of solenoid valves (3) for drawing out part of the water on each water outlet branch pipe of the uppermost cooling wall of the blast furnace; Step 3: All the outlet water of the solenoid valve (3) is collected into a drainage water quality detection tube (6), and a drainage online water quality detector (2) is installed on the drainage water quality detection tube (6); Step 4: the solenoid valve (3) of each branch pipe for leading out part of the drainage of the uppermost cooling wall of the blast furnace is normally closed and controlled by the PLC controller (4) or other controller to be opened in a cycle in sequence and closed after being continuously opened for 8 minutes; Step 5: Identify possible damaged cooling wall water pipes by comparing the water quality data detected by each outlet branch pipe with the water quality data of the inlet main pipe. This can be done manually or by designing a related computer program to achieve automatic identification and prompting. Step 6: The water quality indicators used to determine leaks are conductivity and pH value; Step seven, after determining the specific damaged pipe number based on the difference between the drainage water quality and the inlet water quality, the exhaust valves of the cooling wall water pipes in the corresponding sections can be opened step by step to drain the water, and then the drainage water quality of the section can be tested using a portable water quality detector. The specific damaged section can be determined based on the difference between the drainage water quality and the inlet water quality of each section. Example 4
[0023] A cooling wall water pipe online leak detection method based on water quality detection comprises the following steps: Step 1: Lead out an inlet water quality detection pipe (5) from the blast furnace cooling wall water inlet main pipe and install an inlet water online water quality detector (1); Step 2: installing a plurality of solenoid valves (3) for drawing out part of the water on each water outlet branch pipe of the uppermost cooling wall of the blast furnace; Step 3: All the outlet water of the solenoid valve (3) is collected into a drainage water quality detection tube (6), and a drainage online water quality detector (2) is installed on the drainage water quality detection tube (6); Step 4: the solenoid valve (3) of each branch pipe for leading out part of the drainage of the uppermost cooling wall of the blast furnace is normally closed and controlled by the PLC controller (4) or other controller to be opened in a cycle in sequence and closed after 10 minutes; Step 5: Identify possible damaged cooling wall water pipes by comparing the water quality data detected by each outlet branch pipe with the water quality data of the inlet main pipe. This can be done manually or by designing a related computer program to achieve automatic identification and prompting. Step 6: The water quality indicator used to determine leaks is conductivity; Step seven, after determining the specific damaged pipe number based on the difference between the drainage water quality and the inlet water quality, the exhaust valves of the cooling wall water pipes in the corresponding sections can be opened step by step to drain the water, and then the drainage water quality of the section can be tested using a portable water quality detector. The specific damaged section can be determined based on the difference between the drainage water quality and the inlet water quality of each section.
[0024] It should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A cooling wall water pipe online leak detection method based on water quality detection, characterized in that: The steps include: Step 1: Lead out an inlet water quality detection pipe from the blast furnace cooling wall water inlet main pipe and install an inlet water online water quality detector; Step 2: installing a plurality of electromagnetic valves for drawing out part of the drainage water on each outlet branch pipe of the uppermost cooling wall of the blast furnace; Step 3: All the outlet water of the solenoid valve is collected into a drainage water quality detection tube, on which a drainage online water quality detector is installed; Step 4: The solenoid valve of each branch pipe for leading out part of the drainage of the uppermost cooling wall of the blast furnace is normally closed, controlled by a PLC controller or other controller, and is periodically opened and closed after a period of time; Step 5, identifying possible damaged cooling wall water pipes by comparing the water quality data detected by each outlet branch pipe with the water quality data of the water inlet main pipe; Step 6: The water quality indicators used to determine leaks are conductivity, pH value and TDS; Step seven, after determining the specific damaged pipe number based on the difference between the drainage water quality and the inlet water quality, the exhaust valves of the cooling wall water pipes in the corresponding sections can be opened step by step to drain the water, and then the drainage water quality of the section can be tested using a portable water quality detector. The specific damaged section can be determined based on the difference between the drainage water quality and the inlet water quality of each section.
2. The method for online leak detection of cooling wall water pipes based on water quality detection according to claim 1 is characterized in that: The step 4 is periodically opened and closed in turn for 0.5-10 minutes.
3. The method for online leak detection of cooling wall water pipes based on water quality detection according to claim 1 is characterized in that: The judgment method of step five can be manually judged, or a related computer program can be designed to realize automatic judgment and prompting.
4. The method for online leak detection of cooling wall water pipes based on water quality detection according to claim 1 is characterized in that: The water quality index used to determine the leak detection in step 6 may be one or more of conductivity, pH value and TDS index.