Blast furnace cooling system convenient for leak detection

Abstract

The utility model discloses a blast furnace cooling system convenient for leak detection, which comprises a blast furnace and a cooling wall group arranged in the blast furnace, the cooling wall group consists of a plurality of cooling wall plates which are connected in series up and down, an S-shaped pipeline is arranged in each cooling wall plate, and two ends of each S-shaped pipeline are respectively connected with a water inlet and a water outlet. A first valve is arranged on a connecting water pipe of two adjacent cooling wall plates, and the plurality of cooling wall groups are annularly arranged around the inner side wall of the blast furnace; the water inlet pipe is connected with the water inlet of the lowest cooling wall plate, a first flow sensor is arranged on the water inlet pipe, the water outlet pipe is connected with the water outlet of the uppermost cooling wall plate, a second flow sensor is arranged on the water outlet pipe, and the water outlet pipe is connected with the water return pool. The utility model has the characteristics of strong practicability, safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace cooling technology, specifically to a blast furnace cooling system that facilitates leak detection. Background Technology

[0002] With the development of blast furnace ironmaking technology, the utilization coefficient and smelting intensity of blast furnaces have been continuously improved. This has led to increased heat loads in the belly, waist, and lower part of the furnace body, and frequent occurrences of rising hearth sidewall temperatures, threatening the long-term stable operation of the blast furnace. The unstable slag crust formed in the high-heat-load areas of the belly, waist, and lower part of the furnace body can damage the cooling walls in these areas. If damage to the cooling walls is not detected in time, it will not only accelerate the damage but also easily lead to thickening of the furnace walls, hearth accumulation, furnace cooling issues, and poor furnace conditions. In severe cases, it can even cause gas leaks or explosions. Furthermore, the cooling walls contain over a hundred water pipes, making leak detection and location extremely difficult after damage.

[0003] Chinese patent application CN202023010031.5, entitled "Blast Furnace Cooling Wall Structure," discloses a structure comprising a cooling wall, a castable body, cooling water pipes, anchors, and mounting connectors. The castable body is cast onto the hot surface of the cooling wall, cooling water pipes are arranged inside the cooling wall, the cooling wall and the castable body are connected by the anchors, and the cooling wall and the blast furnace shell are connected by the mounting connectors. This patent avoids the use of expensive heat-resistant bricks, greatly reducing the manufacturing cost of the blast furnace cooling wall structure; this blast furnace cooling wall structure also effectively avoids the problem of heat-resistant brick breakage at the dovetail groove, extending the service life of the blast furnace cooling wall structure. However, it does not address the issues mentioned in this application. Utility Model Content

[0004] This invention aims to overcome the deficiencies of existing technologies and provide a blast furnace cooling system that facilitates leak detection, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A blast furnace cooling system for easy leak detection includes a blast furnace and cooling wall assemblies installed inside the blast furnace. The cooling wall assemblies consist of multiple cooling wall panels connected in series. S-shaped pipes are installed inside the cooling wall panels, with inlet and outlet pipes connected to the two ends of the S-shaped pipes respectively. A first valve is installed on the connecting water pipe between two adjacent cooling wall panels. The multiple cooling wall assemblies are arranged circumferentially around the inner wall of the blast furnace. The inlet pipe is connected to the inlet of the lowermost cooling wall panel and is equipped with a first flow sensor. The outlet pipe is connected to the outlet of the uppermost cooling wall panel and is equipped with a second flow sensor. The outlet pipe is connected to a return water pool.

[0007] The aforementioned blast furnace cooling system, designed for easy leak detection, is equipped with a monitoring component. A second valve is installed on the inlet pipe, and a third valve is installed on the outlet pipe. The first, second, and third valves are power valves. The monitoring component consists of a CPU and a control circuit. The signal outputs of the first and second flow sensors are connected to the input terminals of the CPU, and the output terminals of the CPU are connected to control relays via transistor amplifier circuits. The relays are connected to control the first, second, and third valves. One output terminal of the CPU is connected to an alarm light H, a voice chip IC, and a speaker L via a transistor amplifier circuit and a relay.

[0008] The aforementioned blast furnace cooling system, which facilitates leak detection, has a first pressure sensor installed between the second valve and the water inlet of the lowest cooling wall plate. A gas collecting tank is installed on the water outlet pipe, and a second pressure sensor and a venting valve are installed on the gas collecting tank. The venting valve is a power valve. The signal outputs of the first and second pressure sensors are respectively connected to the input terminals of the CPU, and one output terminal of the CPU is connected to control the venting valve.

[0009] The aforementioned blast furnace cooling system, which facilitates leak detection, has two S-shaped pipes with independent inlets and outlets installed in each cooling wall panel. The two S-shaped pipes of adjacent cooling wall panels are connected in series separately, forming two independent S-shaped cooling water paths in each cooling wall group.

[0010] The aforementioned blast furnace cooling system, which facilitates leak detection, has 18-32 cooling wall groups.

[0011] The aforementioned blast furnace cooling system, which facilitates leak detection, consists of 12-19 cooling wall panels connected in series in each group.

[0012] Beneficial effects

[0013] Compared to existing technologies, this invention has the following advantages: A cooling wall assembly is formed by multiple cooling wall panels connected in series. A first flow sensor and a second flow sensor are respectively installed on the inlet pipe below and the outlet pipe above the cooling wall assembly. A first valve is installed on the pipe between adjacent cooling wall panels. By coordinating the opening and closing of the two flow sensors and the first valve, the cooling wall panel with a leak can be accurately located. The monitoring component controls the opening and closing of the first, second, and third valves based on changes in the flow sensors, enabling automated detection and real-time alarms upon leakage. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model (not to scale);

[0016] Figure 2 This is a schematic diagram of the cooling wall assembly of this utility model;

[0017] Figure 3 This is a schematic diagram of the control circuit of this utility model;

[0018] The labels in the diagram represent:

[0019] 1. Blast furnace; 2. Cooling wall assembly; 2-1. Cooling wall panel; 2-2. Water inlet pipe; 2-3. Water outlet pipe; 2-4. First flow sensor; 2-5. Second flow sensor; 2-6. Connecting water pipe; 2-7. First valve; 2-8. Second valve; 2-9. Third valve; 2-10. First pressure sensor; 3. Gas collection tank; 3-1. Second pressure sensor; 3-2. Gas release valve; 4. Return water tank; T1-T4. First transistor-fourth transistor; J1-J4. First relay-fourth relay; IC. Voice chip; H. Alarm light; L. Speaker. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1-3 As shown, this utility model includes a blast furnace 1 and a cooling wall assembly 2 disposed within the blast furnace 1. The cooling wall assembly 2 consists of multiple cooling wall panels 2-1 connected vertically in series. An S-shaped pipe 2-1-1 is installed within each cooling wall panel 2-1, with an inlet and an outlet connected to both ends of the S-shaped pipe 2-1-1. A first valve 2-7 is installed on the connecting water pipe 2-6 between adjacent cooling wall panels 2-1. Multiple cooling wall assemblies 2 are arranged circumferentially around the inner wall of the blast furnace 1. In the structure of the cooling wall assembly 2, cold water enters from the lowest cooling wall panel 2-1. The outlet of the lower cooling wall panel 2-1 is sequentially connected to the inlet of the upper cooling wall panel 2-1, and so on, until it reaches the highest cooling wall panel 2-1. A first valve 2-7 is installed between adjacent cooling wall panels 2-1. The number of cooling wall assemblies 2 is 18-32. Each cooling wall assembly 2 consists of 12-19 cooling wall panels 2-1 connected vertically in series. The arrows in the diagram indicate the direction of water flow.

[0022] The water inlet pipe 2-2 is connected to the water inlet of the lowest cooling wall panel 2-1, and a first flow sensor 2-4 is installed on it. The water outlet pipe 2-3 is connected to the water outlet of the uppermost cooling wall panel 2-1, and a second flow sensor 2-5 is installed on it. The water outlet pipe 2-3 is connected to the return water tank 4. A cooling tower and a booster pump D are also installed between the water inlet pipe 2-2 and the return water tank 4 to ensure that the water temperature entering the cooling wall assembly 2 is less than 35℃.

[0023] Based on the difference in water flow between the first flow sensor 2-4 and the second flow sensor 2-5, it can be determined whether there is a leak in the cooling wall assembly 2. When it is determined that there is a leak in a certain cooling wall assembly 2, the specific location of the leak can be determined by closing the first valve 2-7 installed between the upper and lower adjacent cooling wall panels 2-1; firstly, close the uppermost first valve 2-7. If the flow rate of the first flow sensor 2-4 drops to zero after closing, it indicates that there is a leak in the uppermost cooling wall panel 2-1.

[0024] If there is still flow in the first flow sensor 2-4 after it is closed, then the amount of this flow is the leakage. Then, the first valves 2-7 are closed sequentially from high to low. After each first valve 2-7 is closed, the leakage point is determined by the change in the reading of the first flow sensor 2-4. For example, if there is flow in the first flow sensor 2-4 before a certain first valve 2-7 is closed but there is no flow after it is closed, it indicates that there is a leakage in the cooling wall plate 2-1 adjacent to that first valve 2-7.

[0025] To enhance the automation of leak detection, the following solution can be adopted: A monitoring component is added, with a second valve 2-8 installed on the inlet pipe 2-2 and a third valve 2-9 installed on the outlet pipe 2-3. The first valve 2-7, second valve 2-8, and third valve 2-9 are power valves, optionally solenoid valves. The monitoring component consists of a CPU and a control circuit. The signal outputs of the first flow sensor 2-4 and the second flow sensor 2-5 are connected to the CPU's input terminals. The CPU's output terminals are connected to control relays via transistor amplifier circuits. These relays control the first valve 2-7, the second valve 2-8, and the third valve 2-9. An indicator light is connected in parallel with the circuit controlling the first valve 2-1, and each indicator light corresponding to the first valve 2-1 is labeled. One output terminal of the CPU is connected to an alarm light H, a voice chip IC, and a speaker L via a transistor amplifier circuit and relays. The CPU can be a C8051F340 series chip, and the voice chip can be a SYN6288 series chip. When the alarm light H, voice chip IC, and speaker L are working, it indicates that there is a leak. At the same time, the indicator light numbers can be used to determine which cooling plate 2-1 is leaking. The CPU output is connected to the base of a transistor, the collector of the transistor is connected to a relay, and the normally open contact of the relay is connected to the power valve or other electrical equipment. Figure 3 The illustration only shows one first valve 2-7; in reality, there are multiple first valves 2-7 between adjacent cooling wall panels 2-1, which are omitted in the diagram. If the leakage of cooling wall assembly 2 is small, the opening of the second valve 2-8 and the third valve 2-9 can be adjusted, along with the first flow sensor 2-4 and the second flow sensor 2-5, to adjust the water pressure to be the same as or close to the gas pressure inside the blast furnace. The two will balance each other, reducing the leakage to zero or minimal, and temporarily maintaining normal production.

[0026] Leakage can also be determined by monitoring the opening and closing of the first valve 2-7, the second valve 2-8, and the third valve 2-9, combined with pressure changes in the pipeline. A first pressure sensor 2-10 is installed between the second valve 2-8 and the water inlet of the lowest cooling wall panel 2-1. A gas collection tank 3 is installed on the water outlet pipe 2-3, and a second pressure sensor 3-1 and a vent valve 3-2 are installed on the gas collection tank 3. The vent valve 3-2 is a power valve, which can be a solenoid valve. The signal outputs of the first pressure sensor 2-10 and the second pressure sensor 3-1 are respectively connected to the input terminal of the CPU, and one output terminal of the CPU is connected to control the vent valve 3-2. If the second pressure sensor 3-1 detects an increase in pressure, it indicates that there may be a leak in the cooling wall assembly 2, causing gas to flow back into the cooling wall assembly 2.

[0027] The cooling wall panel can also be equipped with independent dual water channels to prevent the cooling wall from becoming completely inoperable if a single water channel leaks, or to use a double-layer cooling method for larger cooling walls. Each cooling wall panel 2-1 is equipped with two S-shaped pipes 2-1-1 with independent inlets and outlets. The two S-shaped pipes 2-1-1 of adjacent cooling wall panels 2-1 are connected in series separately, forming two independent S-shaped cooling water channels in each cooling wall group 2.

Claims

1. A blast furnace cooling system that is easy to detect leaks. Its characteristics are: The invention comprises a blast furnace (1) and a cooling stave group (2) arranged in the blast furnace (1), wherein the cooling stave group (2) is composed of a plurality of cooling stave plates (2-1) connected in series from top to bottom, an S-shaped pipeline (2-1-1) is arranged in the cooling stave plate (2-1), two ends of the S-shaped pipeline (2-1-1) are respectively connected to a water inlet and a water outlet, a first valve (2-7) is arranged on a connecting water pipe (2-6) of two adjacent cooling stave plates (2-1), and a plurality of cooling stave groups (2) are arranged in a circumferential direction around the inner wall of the blast furnace (1); the water inlet pipe (2-2) is connected to the water inlet of the lowest cooling stave plate (2-1), and a first flow sensor (2-4) is arranged thereon, the water outlet pipe (2-3) is connected to the water outlet of the highest cooling stave plate (2-1), and a second flow sensor (2-5) is arranged thereon, and the water outlet pipe (2-3) is connected to a return water pool (4).

2. The blast furnace cooling system for easy leak detection according to claim 1, Its characteristics are: A monitoring component is added, wherein a second valve (2-8) is arranged on the water inlet pipe (2-2), and a third valve (2-9) is arranged on the water outlet pipe (2-3); the first valve (2-7), the second valve (2-8) and the third valve (2-9) are power valves; the monitoring component is composed of a CPU and a control circuit, the signal outputs of the first flow sensor (2-4) and the second flow sensor (2-5) are respectively connected to the input end of the CPU, the output end of the CPU is respectively connected to the control relay through the triode amplifier circuit, and the relay is connected to control the first valve (2-7), the second valve (2-8) and the third valve (2-9); one output end of the CPU is connected to an alarm light H, a voice chip IC and a speaker L through the triode amplifier circuit and the relay.

3. The blast furnace cooling system for easy leak detection according to claim 2, Its characteristics are: A first pressure sensor (2-10) is arranged between the second valve (2-8) and the water inlet of the lowest cooling wall plate (2-1); an air collecting tank (3) is arranged on the water outlet pipe (2-3); a second pressure sensor (3-1) and an air release valve (3-2) are arranged on the air collecting tank (3); the air release valve (3-2) is a power valve; the signal outputs of the first pressure sensor (2-10) and the second pressure sensor (3-1) are respectively connected to the input end of the CPU; and an output end of the CPU is connected to control the air release valve (3-2).

4. The blast furnace cooling system for easy leak detection according to claim 1, Its characteristics are: Two S-shaped pipes (2-1-1) with independent water inlets and outlets are arranged in each cooling stave plate (2-1), and the two S-shaped pipes (2-1-1) of adjacent cooling stave plates (2-1) are connected in series separately, so as to form two independent S-shaped cooling water paths in each cooling stave group (2).

5. The blast furnace cooling system for easy leak detection according to claim 1, Its characteristics are: The number of cooling wall groups (2) is 18-32.

6. The blast furnace cooling system for easy leak detection according to claim 1, Its characteristics are: Each cooling wall group (2) is composed of 12 to 19 cooling wall panels (2-1) connected in series up and down.

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