A dosing device for soft water circulation cooling system in steel plant

Abstract

The embodiment of the utility model provides a dosing device for a soft water circulation cooling system of a steel plant, including a monitoring pipeline and a dosing pipeline; the inlet end of the monitoring pipeline is connected to the outlet pipe of the soft water circulation cooling system of the steel plant, the outlet end of the monitoring pipeline is connected to the return pipe of the soft water circulation cooling system of the steel plant, the monitoring pipeline is provided with a first control valve, a monitoring tank, and a second control valve in sequence, the monitoring tank is provided with a pH meter, and the pH meter is electrically connected to the controller; the inlet end of the dosing pipeline is connected to the monitoring pipeline between the monitoring tank and the second control valve, the outlet end of the dosing pipeline is connected to the return pipe of the soft water circulation cooling system of the steel plant, the dosing pipeline is provided with a third control valve, a dosing buffer tank, and a fourth control valve in sequence; the top of the dosing buffer tank is also connected to a reagent adding pipe. Through this technical solution, water quality can be monitored online in real time, and remote dosing of reagents can be achieved, ensuring the stability of water quality.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating cooling water treatment, in particular to a dosing device, more specifically to a dosing device for a soft water circulating cooling system in a steel plant. Background Art

[0002] The cooling system of the blast furnace in the iron and steel plant includes various cooling equipment such as the blast furnace cooling wall, tuyere, furnace bottom, hot air valve, etc., and the heat load intensity of these equipment is extremely high, especially the heat flux density of the blast furnace tuyere small sleeve is high. If the indirect cooling method with raw water as the supplementary water is adopted, it is operated at a low concentration multiple, even if the scale inhibitor is added, the scaling of these heat exchange equipment cannot be avoided, and the scaling affects the life of the blast furnace. Therefore, in order to increase the life of the blast furnace, it is now generally adopted to supply high-quality cooling water. The use of soft water (pure water) closed circulation cooling system avoids equipment scaling, and at the same time there is no forced sewage discharge, which is also the preferred method from the perspective of environmental protection. However, the soft water circulation cooling system has low hardness and strong corrosiveness, and it is necessary to regularly add corrosion inhibitors to the water to solve the problem of water corrosion. At present, the corrosion inhibitors in enterprises are added by mechanical diaphragm metering pump + dosing tank, and the water quality is monitored by manual on-site sampling back to the laboratory.

[0003] In the process of implementing the present utility model, the inventors found that there are at least the following problems in the prior art:

[0004] Since manual sampling is required on-site and then returned to the laboratory for testing, the existing technology has the problem of delayed water quality test results and inability to add chemicals online in real time. In addition, when the water quality results are low, operators are required to rush to the site to add chemicals, which makes the water quality treatment work more delayed, which in turn leads to the problem of unstable water quality indicators in the soft water circulation cooling system, affecting the normal production process. Therefore, how to achieve real-time water quality monitoring and remote chemical addition to ensure stable water quality indicators is a problem that needs to be solved. Utility Model Content

[0005] The utility model provides a dosing device for a soft water circulation cooling system of a steel plant, which is used to solve the problem of delayed water quality monitoring and dosing of chemicals in the prior art, which leads to unstable water quality indicators.

[0006] To achieve the above-mentioned purpose, an embodiment of the utility model provides a dosing device for a soft water circulating cooling system of a steel plant, comprising a monitoring pipeline and a dosing pipeline; the inlet end of the monitoring pipeline is connected to the outlet pipe of the soft water circulating cooling system of the steel plant, the outlet end of the monitoring pipeline is connected to the return pipe of the soft water circulating cooling system of the steel plant, a first control valve, a monitoring tank, and a second control valve are sequentially arranged in the monitoring pipeline, a pH meter is arranged in the monitoring tank, and the pH meter is electrically connected to a controller; the inlet end of the dosing pipeline is connected to the monitoring pipeline between the monitoring tank and the second control valve, the outlet end of the dosing pipeline is connected to the return pipe of the soft water circulating cooling system of the steel plant, a third control valve, a dosing buffer tank, and a fourth control valve are sequentially arranged in the dosing pipeline; a reagent adding pipeline is also connected to the top of the dosing buffer tank.

[0007] Furthermore, the first control valve, the second control valve, the third control valve, and the fourth control valve are all solenoid valves electrically connected to the controller.

[0008] Furthermore, the dosing device of the soft water circulation cooling system of the steel plant also includes a dosing tank, the bottom of which is higher than the top of the buffer tank; the dosing tank is connected to the buffer tank through a reagent adding pipe.

[0009] Furthermore, a fifth control valve is provided in the medicine adding pipeline, and the fifth control valve is a solenoid valve electrically connected to the controller.

[0010] Furthermore, a motor is arranged above the dosing tank, an output shaft end of the motor is connected to a stirrer, and the stirrer extends downward into the dosing tank; the motor is electrically connected to the controller.

[0011] Furthermore, a filling port is provided on the top of the dosing tank.

[0012] The above technical solution has the following beneficial effects:

[0013] The technical solution of the utility model can realize real-time online detection of water quality and remote precise addition of reagents. There is no need for operators to take samples on site and return to the laboratory for testing as in the prior art. This solves the problem of delayed water quality detection and reagent addition in the prior art, makes water quality operation indicators more stable, and will not cause water quality indicators to deviate seriously from the standard due to changes in drainage, water replenishment and other conditions. The concentration of water quality reagents can always be stabilized within a predetermined range, fully protecting the normal use of production equipment.

[0014] In addition, the technical solution of this application also has the following characteristics:

[0015] 1. Since operators do not need to rush to the site frequently to take samples and add medicines, the labor intensity can be greatly reduced, thereby reducing labor costs; at the same time, since the reagents can be accurately added according to the monitored values, the waste that is easy to occur during manual operation can be avoided, reducing the loss of reagents.

[0016] 2. In the present technical solution, by introducing a dosing buffer tank and making the height of the dosing tank higher than the height of the dosing buffer tank, the reagent can enter the soft water circulation cooling system through the dosing buffer tank under the action of gravity, without the need for an additional dosing pump, thereby reducing the equipment cost; and, since the soft water corrosion inhibitor is a strong alkaline type, it is easy to corrode the dosing pump equipment accessories, resulting in frequent and intensive maintenance work. However, the present application eliminates the dosing pump, so there is no need for maintenance, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a structural schematic diagram of a dosing device for a soft water circulation cooling system in a steel plant according to an embodiment of the utility model;

[0019] Figure numbers: 1. Dosing tank; 2. Fifth control valve; 3. Drug adding pipeline; 4. Dosing buffer tank; 5. Dosing pipeline; 6. Fourth control valve; 7. Monitoring pipeline; 8. Third control valve; 9. Second control valve; 10. Tee; 11. Monitoring tank; 12. First control valve; 13. Platform; 14. Filling port; 15. Motor; 16. Agitator; 17. Controller. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1As shown, an embodiment of the utility model provides a dosing device for a soft water circulation cooling system of a steel plant, comprising a monitoring pipeline 7 and a dosing pipeline 5; the inlet end of the monitoring pipeline 7 is connected to the outlet pipe of the soft water circulation cooling system of the steel plant, the outlet end of the monitoring pipeline 7 is connected to the return pipe of the soft water circulation cooling system of the steel plant, the monitoring pipeline 7 is sequentially provided with a first control valve 12, a monitoring tank 11, and a second control valve 9, the monitoring tank 11 is provided with a pH meter, and the pH meter is electrically connected to a controller 17; the inlet end of the dosing pipeline 5 is connected to the monitoring pipeline 7 between the monitoring tank 11 and the second control valve 9, the outlet end of the dosing pipeline 5 is connected to the return pipe of the soft water circulation cooling system of the steel plant, the dosing pipeline 5 is sequentially provided with a third control valve 8, a dosing buffer tank 4, and a fourth control valve 6; the top of the dosing buffer tank 4 is also connected to a reagent adding pipeline 3.

[0022] In order to solve the above-mentioned problems, in the present application, a monitoring pipeline 7 is separately set in the dosing device, and the monitoring pipeline 7 can be connected to the soft water circulation cooling system of the steel plant, and a pH meter is set in the monitoring pipeline 7, and the signal output end of the pH meter is connected to the controller 17 of the central control room, which is used for measuring the pH value in the pipeline of the soft water circulation cooling system, so as to determine whether the water quality in the pipeline meets the requirements; if the measured pH value exceeds the standard, the other dosing pipeline 5 is connected (the connection point between the monitoring pipeline 7 and the dosing pipeline 5 is a three-way 10), so that the circulating cooling water flows through the dosing pipeline 5, and the medicine pre-injected into the dosing buffer tank 4 is injected into the soft water circulation cooling system of the steel plant through the flow of the circulating cooling water. When the water quality meets the requirements after the dosing, the dosing pipeline 5 is turned off so that it is no longer connected to the soft water circulation cooling system of the steel plant. In order to facilitate the arrangement of the pH meter, a monitoring tank 11 is set in the monitoring pipeline 7, and the pH meter is set in the monitoring tank 11.

[0023] The detailed description of the operation process is as follows: Figure 1As shown, in normal operation, the first control valve 12 is normally open, and the second control valve 9 is opened. At this time, the water of the circulating cooling system flows through the monitoring pipeline 7 (flowing from point O to point F in the figure), and the pH meter measures the pH value in the pipeline online, and feeds back the result to the controller 17 set in the central control room; when the pH value is detected to be less than 9.0 (the water quality index requires the pH value to be greater than 9.0), the dosing buffer tank 4 is filled with the agent through the agent adding pipeline 3; when the dosing buffer tank 4 is filled, the operator remotely closes the agent adding pipeline 3, opens the fourth control valve 6 and the third control valve 8, and The second control valve 9 is closed, so that point F in the monitoring pipeline 7 is cut off, and the dosing pipeline 5 is connected to the circulating cooling system. The reagent in the dosing buffer tank 4 will flow from point O to point G in the figure driven by water pressure and flow into the soft water circulating cooling system of the steel plant, thereby adjusting the pH value in the circulating cooling system; thereafter, when the pH meter detects that the pH value is greater than 9.0, it means that the water quality has met the requirements. At this time, the third control valve 8 is remotely closed and the second control valve 9 is opened, thereby shutting off the dosing pipeline 5, and connecting the monitoring pipeline 7 again, so that the water continues to flow from point O to point F in the figure.

[0024] Furthermore, the first control valve 12 , the second control valve 9 , the third control valve 8 , and the fourth control valve 6 are all solenoid valves electrically connected to the controller 17 .

[0025] All control valves can be manual valves, but in order to achieve remote control, solenoid valves are preferably used.

[0026] Furthermore, the dosing device of the soft water circulation cooling system of the steel plant also includes a dosing tank 1, the bottom of which is higher than the top of the dosing buffer tank 4; the dosing tank 1 is connected to the dosing buffer tank 4 through the reagent adding pipeline 3.

[0027] There are many ways to add medicine to the dosing buffer tank 4, such as a traditional dosing pump. In the present application, in order to overcome the disadvantage that the accessories of the dosing pump are easily corroded, a gravity-type dosing method is adopted. As shown in the figure, the dosing tank 1 can be placed on a platform 13 of a set height, and an opening is provided at point A near the bottom of the dosing tank 1, so that the end of the agent adding pipeline 3 away from the dosing buffer tank 4 is connected to the opening, so that under the action of gravity, the agent can spontaneously flow from the dosing tank 1 to the dosing buffer tank 4.

[0028] Furthermore, in order to prevent interference to the dosing tank 1 during the dosing process (at this time, the circulating water flows from point O to point F in the figure), a fifth control valve 2 may be provided in the reagent adding pipeline 3. The fifth control valve 2 is an electromagnetic valve electrically connected to the controller 17. When the dosing buffer tank 4 is full of reagent, the fifth control valve 2 is closed to isolate the dosing buffer tank 4 from the dosing tank 1.

[0029] Furthermore, according to usage requirements, the agent needs to be mixed evenly before being added. For this purpose, a motor 15 is arranged above the dosing tank 1, and an agitator 16 is connected to the output shaft end of the motor 15. The agitator 16 extends downward into the dosing tank 1; the motor 15 is electrically connected to the controller, and the agitator 16 can be remotely started through the controller 17.

[0030] Furthermore, a filling port 14 is provided on the top of the dosing tank 1 , and the filling port is used to introduce the medicine in the tank truck for transporting the medicine into the dosing tank 1 .

[0031] The following is a specific application example of a blast furnace closed soft water circulation cooling system to illustrate the technical solution of this application:

[0032] This specific implementation example Figure 1 As shown, a platform 13 about 1.5m high is built to 3 The dosing tank 1 is placed on the platform 13, and then a cylindrical dosing buffer tank 4 with a length of 1m and a bottom diameter of 35cm is made of stainless steel, and the prepared dosing buffer tank 4 is placed horizontally. The bottom outlet of the dosing tank 1 is marked as point A, and connected to the right side of the upper end of the dosing buffer tank 4 is marked as point B. A DN50mm pipeline is connected between points A and B, that is, the reagent adding pipeline 3, and a fifth control valve 2 is set in the reagent adding pipeline 3 to control the reagent in the dosing tank; the upper left end of the dosing buffer tank 4 is marked as point C, and a DN50mm stainless steel pipe is led out, that is, the dosing pipeline 5, and a fourth control valve 6 is installed in the dosing pipeline 5, and the other end of the dosing pipeline 5 is connected to the return pipe of the soft water circulation cooling system of the steel plant; the outlet pipe of the soft water circulation cooling system of the steel plant is marked as point O, and a DN50mm stainless steel pipeline is led out to the middle bottom point D on the right side of the dosing buffer tank 4, and the first control valve 12 and the third control valve 8 (the third control valve 8 is located at the bottom of the first control valve 12 and the third control valve 8 are arranged in sequence on the pipeline. At 20cm in front of point D); connect a tee 10 at about 20cm on the right side of the third control valve 8, the tee 10 can be marked as E, and connect a 30cm*30cm*20cm stainless steel monitoring tank 11 between point E and the first control valve 12; another stainless steel pipe is installed at one end of the idle outlet of the tee 10, and the stainless steel pipe leads to the return pipe of the soft water circulation cooling system of the steel plant (marked as F), and a second control valve 9 is set in the pipe. At this time, the pipeline at points O and F is the monitoring pipeline 7; thereafter, add an online pH meter in the monitoring tank 11, and the probe of the online pH meter preferably adopts a composite electrode. After the online pH meter measures the circulating water flowing through the monitoring tank 11, the measurement data is transmitted to the controller 17 (for example, a computer) in the main control room through the matching sensor.

[0033] After testing, it was found that before the dosing device was used, the soft water circulation cooling system consumed an average of 55kg of chemicals per day, and the average pH value of the key water quality indicator was 9.19. After 30 consecutive days of testing, the system consumed an average of 38kg of chemicals per day after use, and the average pH value of the key water quality indicator was 9.49, that is, the system's dosing amount decreased by an average of 17kg per day, and the pH value of the key water quality indicator increased by 30%. Moreover, the dosing amount was more stable, and the water quality data was more stable, which was qualified in all time periods, and can fully guarantee the efficient production of the blast furnace.

[0034] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the utility model is in a state with less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim acting alone as a separate preferred embodiment of the utility model.

[0035] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in the present application.

[0036] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A dosing device for a soft water circulation cooling system in a steel plant, characterized in that: The invention comprises a monitoring pipeline (7) and a dosing pipeline (5); the inlet end of the monitoring pipeline (7) is connected to the outlet pipe of the soft water circulation cooling system of the steel plant, the outlet end of the monitoring pipeline (7) is connected to the return pipe of the soft water circulation cooling system of the steel plant, the monitoring pipeline (7) is provided with a first control valve (12), a monitoring tank (11), and a second control valve (9) in sequence, the monitoring tank (11) is provided with a pH meter, and the pH meter is electrically connected to a controller (17); the inlet end of the dosing pipeline (5) is connected to the monitoring pipeline (7) between the monitoring tank (11) and the second control valve (9), the outlet end of the dosing pipeline (5) is connected to the return pipe of the soft water circulation cooling system of the steel plant, the dosing pipeline (5) is provided with a third control valve (8), a dosing buffer tank (4), and a fourth control valve (6) in sequence; the top of the dosing buffer tank (4) is also connected to a reagent adding pipeline (3).

2. The dosing device for the soft water circulation cooling system of a steel plant according to claim 1, characterized in that: The first control valve (12), the second control valve (9), the third control valve (8), and the fourth control valve (6) are all solenoid valves electrically connected to the controller (17).

3. The dosing device of the soft water circulation cooling system of a steel plant as claimed in claim 1, characterized in that: It also comprises a dosing tank (1), the bottom of which is higher than the top of the dosing buffer tank (4); the dosing tank (1) is connected to the dosing buffer tank (4) via the drug adding pipeline (3).

4. The dosing device for the soft water circulation cooling system of a steel plant as claimed in claim 3, characterized in that: The drug adding pipeline (3) is also provided with a fifth control valve (2), and the fifth control valve (2) is a solenoid valve electrically connected to the controller (17).

5. The dosing device for the soft water circulation cooling system of a steel plant as claimed in claim 3, characterized in that: A motor (15) is arranged above the dosing tank (1), and an agitator (16) is connected to the output shaft end of the motor (15), and the agitator (16) extends downward into the dosing tank (1); the motor (15) is electrically connected to the controller.

6. The dosing device for the soft water circulation cooling system of a steel plant as claimed in claim 3, characterized in that: The top of the medicine adding tank (1) is provided with a filling port (14).

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