Ash discharging system and method for gravity dust collector of blast furnace

Abstract

The invention discloses an ash discharging system and method for a blast furnace gravity dust collector, and belongs to the technical field of blast furnace gravity dust collection. The system comprises a blast furnace, a gravity dust collector, a semi-clean gas pipeline, a dust discharging ball valve, a dust discharging feeder, a humidifying stirrer, a dust discharging vehicle, a dust gas pumping and discharging pipeline, a dust collection environment-friendly pipe network and a safe nitrogen pipeline. The method comprises the following steps: S1, temperature detection: when the temperature detected by a dust retention temperature sensor is lower than a dust-containing gas normal value by a certain proportion or below, discharging dust; s2, during ash discharging, a humidifying stirrer and an ash discharging feeder are started firstly, the opening degree K1 of a water control valve is adjusted, the opening degree S of a flow control valve is adjusted, and then an ash discharging ball valve is opened; s3, according to the detection data, the opening degree of a water control valve is adjusted, and the opening degree of a flow control valve is adjusted; if the alarm device is detected to be triggered, the ash discharging ball valve is closed through interlocking control, and the interlocking control audible and visual alarm responds to an alarm to prompt field operating personnel; and S4, detecting the gas amount in the dust removal main pipe by the gas alarm instrument, and opening a nitrogen valve to reduce the gas concentration in the dust removal main pipe when the gas detection exceeds a certain value. The technical problems that a traditional dust discharging system of a blast furnace gravity dust remover has gas leakage and dust floating objects on site, the automation degree is low, and a dust removal environment-friendly pipe network has potential safety hazards are solved.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace gravity dust removal, and in particular to a blast furnace gravity dust collector ash unloading system and method. Background Art

[0002] At present, in the metallurgical industry, blast furnace gravity dust collectors are widely used for ash unloading. Blast furnace gravity dust collectors are the first dust removal equipment for raw coal gas from the blast furnace top. The coal gas from the blast furnace top has a fast flow rate and a high dust concentration. The coal gas passes through the downcomer and reaches the gravity dust collector. Most of the dust and particulate matter in the coal gas falls to the bottom of the gravity dust collector under the action of its own gravity. The coal gas with dust and particulate matter removed flows through the bag dust removal system, and the coal gas is finely dusted to obtain clean coal gas. The dust and particulate matter that fall to the bottom of the gravity dust collector are discharged from the bottom of the gravity dust collector. In production practice, this technology has the following deficiencies: 1. Blast furnace gas has complex composition and high toxicity, and there are major safety hazards of gas leakage and dust floating on site; 2. The degree of automation is not perfect. Operators carry gas measuring instruments for on-site operation, manually switch valves, and judge the ash unloading situation by the number of ash unloading trucks, which poses a major accident hazard of waste gas leakage; 3. When the gas concentration is too high, the dust removal and environmental protection pipeline network has no emergency fire-fighting equipment. Therefore, it is necessary to improve the existing blast furnace gravity dust collector ash unloading system to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a blast furnace gravity dust collector ash unloading system and method to solve the technical problems of on-site gas leakage, dust floating, low degree of automation and safety hazards in the dust removal and environmental protection pipeline network in the traditional blast furnace gravity dust collector ash unloading system.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A blast furnace gravity dust collector ash unloading system, comprising a blast furnace, a gravity dust collector, a semi-clean gas pipeline, an ash unloading ball valve, an ash unloading feeder, a humidifying mixer, an ash unloading vehicle, a dust gas extraction pipeline, a dust removal environmental protection pipeline network and a safety nitrogen pipeline; the blast furnace is connected to the gravity dust collector through a gravity gas pipeline, the semi-clean gas pipeline is connected to the upper part of the gravity dust collector, and a raw gas shut-off valve is arranged on the semi-clean gas pipeline; the ash unloading ball valve, the ash unloading feeder and the humidifying mixer are sequentially arranged at the lower discharge port of the gravity dust collector through pipelines to form an ash unloading system. The dust unloading vehicle is used to receive the ash from the humidifying mixer; a dust hood is provided at one end of the dust and gas extraction pipeline, and the dust hood is covered on the dust unloading vehicle; a flow control valve is provided on the dust and gas extraction pipeline and is connected to the dust removal and environmental protection pipeline network, and a nitrogen valve is provided on the safety nitrogen pipeline and is connected to the dust removal and environmental protection pipeline network; a plurality of dust temperature sensors are provided at the lower part of the gravity dust collector, a detection alarm device is provided around the ash unloading vehicle, and a gas temperature sensor and a first gas detector are provided on the dust removal and environmental protection pipeline network.

[0006] Furthermore, it also includes a humidifying pipe, and the humidifying pipe is connected to the humidifying mixer through a water control valve.

[0007] Furthermore, the ash unloading ball valve, ash unloading feeder and humidifying mixer are arranged into two groups and form two ash unloading pipelines. There are two ash unloading ball valves on each group of the ash unloading pipelines, and the ash unloading ball valves are arranged as an upper ash unloading ball valve and a lower ash unloading ball valve in sequence.

[0008] Furthermore, the detection and alarm device includes video monitoring, a second gas detector and an interlocking sound and light alarm.

[0009] Furthermore, the video surveillance is connected to the image acquisition preprocessing module system, and the video surveillance and the second gas detector are both involved in interlocking control through the PLC centralized control system.

[0010] Furthermore, the dust accumulation temperature sensor includes a first temperature sensor, a second temperature sensor and a third temperature sensor; the first temperature sensor, the second temperature sensor and the third temperature sensor are arranged in the lower part of the gravity dust collector from top to bottom.

[0011] A ash unloading method for an ash unloading system of a blast furnace gravity dust collector, characterized in that it comprises the following steps:

[0012] S1: Temperature detection. If the temperature detected by the dust temperature sensor is lower than a certain percentage of the normal value of the dusty gas, the ash can be unloaded;

[0013] S2: When unloading ash, first start the humidifying mixer and the ash unloading feeder, adjust the water control valve opening K1, adjust the flow control valve opening S, and then open the ash unloading ball valve;

[0014] S3: According to the detection data, adjust the opening of the water control valve and the flow control valve; if the detection alarm device is triggered, the interlock control closes the ash unloading ball valve, and the interlock control sound and light alarm responds to the alarm to prompt the on-site operators;

[0015] S4: The gas alarm detects the gas volume in the dust removal main pipe. If the gas detection exceeds a certain value, open the nitrogen valve to reduce the gas concentration in the dust removal main pipe.

[0016] Furthermore, in step S2, the detection alarm device includes video monitoring and a second gas detector. The detection alarm device detects the ash unloading port in real time, collects video images and transmits them to the image acquisition preprocessing module system. After analog-to-digital conversion, the switch signal is input into the PLC centralized control system to participate in interlocking control; the second gas detector detects and collects the gas volume in the ash unloading area and participates in interlocking control.

[0017] Furthermore, the video surveillance monitors the ash volume levels into L1, L2, and L3 which increase in sequence, so as to control the corresponding water control valve openings K2, K3, and K4; and adjust the flow control valve openings S1, S2, and S3. When the second gas detector detects that the gas volume is greater than or equal to M3 for a long time, the ash unloading ball valve is interlocked and closed, and the interlock sound and light alarm responds to the alarm to prompt the on-site workers.

[0018] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] The present invention can detect the temperature of the gravity dust collector and its dust removal and environmental protection pipe network, measure the amount of coal gas, convert monitoring video information, collect data into a remote control system, and realize safety interlocking of the ash unloading process, emergency prevention of high coal gas concentration, and alarm prompts. At the same time, it can improve the level of automatic control of ash unloading and environmental protection, reduce on-site coal gas contact, prevent disasters such as poisoning of personnel and pipeline explosion caused by large amounts of coal gas, and improve safety assurance. It solves the technical problems of on-site coal gas leakage, dust floating objects, low automation level, and safety hazards in the dust removal and environmental protection pipe network of the traditional blast furnace gravity dust collector ash unloading system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the plane structure of the present invention;

[0021] Figure 2 This is a control block diagram of the PLC centralized control system of the present invention;

[0022] Figure 3 It is a schematic diagram of the working process of the present invention.

[0023] In the attached drawings, 1-blast furnace, 2-gravity gas pipeline, 3-gravity dust collector, 4-semi-clean gas pipeline, 5-cut-off valve, 6-first temperature sensor, 7-second temperature sensor, 8-third temperature sensor, 9-upper ash unloading ball valve, 10-lower ash unloading ball valve, 11-ash unloading feeder, 12-humidifying mixer, 13-humidifying pipe, 14-water control valve, 15-interlocking sound and light alarm, 16-video monitoring, 17-second gas detector, 18-dust hood, 19-dust gas exhaust pipeline, 20-flow control valve, 21-dust removal environmental protection pipeline network, 22-first gas detector, 23-safety nitrogen pipeline, 24-nitrogen valve, 25-gas temperature sensor. DETAILED DESCRIPTION

[0024] The specific implementation of the invention is further described below with reference to the accompanying drawings.

[0025] In the description of the present invention, it is necessary to understand that the terms "center", "length", "width", "up", "down", "vertical", "horizontal", "top", "bottom", "inside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] See also Figure 1A blast furnace 1 gravity dust collector 3 ash unloading system, comprising a blast furnace 1, a gravity dust collector 3, a semi-clean gas pipeline 4, an ash unloading ball valve, an ash unloading feeder 11, a humidifying mixer 12, an ash unloading vehicle, a dust gas extraction pipeline 19, a dust removal environmental protection pipeline 21 and a safety nitrogen pipeline 23; the blast furnace 1 is connected to the gravity dust collector 3 through a gravity gas pipeline 2, the semi-clean gas pipeline 4 is connected to the upper part of the gravity dust collector 3, and a raw gas shut-off valve 5 is arranged on the semi-clean gas pipeline 4; the ash unloading ball valve, the ash unloading feeder 11 and the humidifying mixer 12 are sequentially arranged at the lower discharge port of the gravity dust collector 3 through pipelines A dust unloading pipeline is formed, and the ash unloading vehicle is used to receive the ash from the humidifying mixer 12; a dust hood 18 is provided at one end of the dust and gas extraction pipeline 19, and the dust hood 18 covers the ash unloading vehicle; a flow control valve 20 is provided on the dust and gas extraction pipeline 19 and is connected to the dust removal and environmental protection pipeline network 21, and a nitrogen valve 24 is provided on the safety nitrogen pipeline 23 and is connected to the dust removal and environmental protection pipeline network 21; a plurality of dust temperature sensors are provided at the lower part of the gravity dust collector 3, a detection alarm device is provided around the ash unloading vehicle, and a gas temperature sensor 25 and a first gas detector 22 are provided on the dust removal and environmental protection pipeline network 21.

[0029] In this embodiment, a humidifying pipe 13 is also included, and the humidifying pipe 13 humidifies the mixer 12 through a water control valve 14. The humidifying pipe 13 is connected to an external water source and can be used to supply water to the humidifying mixer 12 through the water control valve 14, so that the dust in the humidifying mixer 12 is mixed to a certain degree without dusting and flowing.

[0030] In this embodiment, the ash unloading ball valve, the ash unloading feeder 11 and the humidifying mixer 12 are arranged in two groups and form two ash unloading pipelines. There are two ash unloading ball valves on each group of ash unloading pipelines, and the ash unloading ball valves are arranged in sequence as an upper ash unloading ball valve 9 and a lower ash unloading ball valve 10. Through the two ash unloading pipelines, the ash unloading speed can be controlled as required.

[0031] In this embodiment, the detection alarm device includes a video monitor 16, a second gas detector 17 and an interlocking sound and light alarm 15. Specifically, the video monitor 16 is connected to the image acquisition preprocessing module system, and the video monitor 16 and the second gas detector 17 are both involved in interlocking control through the PLC centralized control system.

[0032] In this embodiment, the dust accumulation temperature sensor includes a first temperature sensor 6, a second temperature sensor 7 and a third temperature sensor 8; the first temperature sensor 6, the second temperature sensor 7 and the third temperature sensor 8 are arranged from top to bottom in the lower part of the gravity dust collector 3. The dust accumulation in the lower part of the gravity dust collector 3 is monitored at multiple points to prevent the direct discharge of raw gas due to insufficient dust accumulation, which may cause a large amount of gas leakage.

[0033] See also Figure 2The video monitoring 16, the second gas detector 17, the water control valve 14, the flow control valve 20, the first gas detector 22, and the nitrogen valve 24 form a safety interlock control through the PLC centralized control system.

[0034] See also Figure 3 , a ash unloading method of a blast furnace 1 gravity dust collector 3 ash unloading system, comprising the following steps:

[0035] S1: Temperature detection. When the temperature detected by the dust temperature sensor is lower than a certain percentage of the normal value of the dusty gas, ash unloading can be carried out. Specifically, when the temperature detection is lower than 60% of the normal value (T) of the dusty gas, that is, the detection values ​​of the first temperature sensor 6, the second temperature sensor 7 and the third temperature sensor 8 are T1, T2 and T3 respectively, when T3≤T2≤T1≤60%T, ash unloading begins.

[0036] S2: When unloading ash, first start the humidifying mixer 12, start the ash unloading feeder 11, open the lower ash unloading ball valve 10, adjust the opening K1 of the water control valve 14, adjust the opening S of the flow control valve 20, and then open the upper ash unloading ball valve 9; put the temperature control interlock and sound control alarm into effect: T2 temperature is detected once every N1 seconds and recorded as T21. When the temperature rises and changes to T22 ≥ the set value t, the upper ash unloading ball valve 9 is interlocked and closed, and the interlock sound and light alarm 15 responds to the alarm to prompt the on-site workers.

[0037] S3: During normal operation, according to the detection data, the opening of the water control valve 14 is adjusted, the opening of the flow control valve 20 is adjusted, and the video monitoring 16 monitors the ash volume level to be L1<L2<L3, which increases in sequence, so as to control the opening of the corresponding water control valve 14 K2<K3<K4; the second gas detector 17 detects the gas volume level to be M1<M2<M3, which increases in sequence, and adjusts the opening of the flow control valve 20 S1<S2<S3. If the detection alarm device is triggered, the interlock control closes the ash discharge ball valve, and the interlock control sound and light alarm responds to the alarm to prompt the on-site operators; specifically, the detection alarm device includes the video monitoring 16 and the second gas detector 17, the detection alarm device detects the ash discharge port in real time, collects the video image and transmits it to the image acquisition preprocessing module system, and after the analog-to-digital conversion, it is input into the PLC centralized control system to participate in the interlock control; the second gas detector 17 detects and collects the gas volume in the ash discharge area and participates in the interlock control. In addition, when the second gas detector 17 detects that the gas volume is greater than or equal to M3 for a long time, the ash unloading ball valve is interlocked and closed, and the interlock sound and light alarm 15 responds to the alarm to prompt the on-site operators.

[0038] S4: The gas alarm detects the gas volume in the dust removal main pipe. If the gas detection exceeds a certain value, the nitrogen valve 24 is opened to reduce the gas concentration in the dust removal main pipe. Specifically, the first gas detector 22 detects the gas volume in the dust removal main pipe. If the gas detection exceeds a certain value, the nitrogen valve 24 is opened to reduce the percentage of gas content in the dust removal main pipe.

[0039] S5, when shutting down, the water control valve 14, the lower ash unloading ball valve 10, the ash unloading feeder 11 and the humidifying mixer 12 are closed in sequence.

[0040] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A blast furnace gravity dust collector ash unloading system, characterized in that: The utility model comprises a blast furnace, a gravity dust collector, a semi-clean gas pipeline, an ash discharge ball valve, an ash discharge feeder, a humidifying mixer, an ash discharge vehicle, a dust gas extraction pipeline, a dust removal environmental protection pipeline network and a safety nitrogen pipeline; the blast furnace is connected to the gravity dust collector through a gravity gas pipeline, the semi-clean gas pipeline is connected to the upper part of the gravity dust collector, and a raw gas shut-off valve is arranged on the semi-clean gas pipeline; the ash discharge ball valve, the ash discharge feeder and the humidifying mixer are sequentially arranged at the lower discharge port of the gravity dust collector through pipelines to form an ash discharge pipeline, and the ash discharge The vehicle is used to receive the ash from the humidifying mixer; a dust hood is provided at one end of the dust and gas extraction pipeline, and the dust hood is covered on the ash unloading vehicle; a flow control valve is provided on the dust and gas extraction pipeline and is connected to the dust removal and environmental protection pipeline network, and a nitrogen valve is provided on the safety nitrogen pipeline and is connected to the dust removal and environmental protection pipeline network; a plurality of dust accumulation temperature sensors are provided at the lower part of the gravity dust collector, a detection alarm device is provided around the ash unloading vehicle, and a gas temperature sensor and a first gas detector are provided on the dust removal and environmental protection pipeline network.

2. A blast furnace gravity dust collector ash unloading system according to claim 1, characterized in that: It also includes a humidifying pipe, which is connected to the humidifying mixer through a water control valve.

3. The blast furnace gravity dust collector ash unloading system according to claim 1, characterized in that: The ash unloading ball valve, ash unloading feeder and humidifying mixer are arranged in two groups and form two ash unloading pipelines. There are two ash unloading ball valves on each group of the ash unloading pipelines, and the ash unloading ball valves are arranged in sequence as an upper ash unloading ball valve and a lower ash unloading ball valve.

4. The blast furnace gravity dust collector ash unloading system according to claim 1, characterized in that: The detection alarm device includes video monitoring, a second gas detector and an interlocking sound and light alarm.

5. A blast furnace gravity dust collector ash unloading system according to claim 4, characterized in that: The video monitoring and image acquisition preprocessing module system are connected, and the video monitoring and the second gas detector are both involved in interlocking control through the PLC centralized control system.

6. A blast furnace gravity dust collector ash unloading system and method according to claim 1, characterized in that: The dust accumulation temperature sensor includes a first temperature sensor, a second temperature sensor and a third temperature sensor; the first temperature sensor, the second temperature sensor and the third temperature sensor are arranged from top to bottom in the lower part of the gravity dust collector.

7. The ash unloading method of the blast furnace gravity dust collector ash unloading system according to any one of claims 1 to 6, characterized in that: The steps include: S1: Temperature detection. If the temperature detected by the dust temperature sensor is lower than a certain percentage of the normal value of the dusty gas, the ash can be unloaded; S2: When unloading ash, first start the humidifying mixer and the ash unloading feeder, adjust the water control valve opening K1, adjust the flow control valve opening S, and then open the ash unloading ball valve; S3: According to the detection data, adjust the opening of the water control valve and the flow control valve; if the detection alarm device is triggered, the interlock control closes the ash unloading ball valve, and the interlock control sound and light alarm responds to the alarm to prompt the on-site operators; S4: The gas alarm detects the gas volume in the dust removal main pipe. If the gas detection exceeds a certain value, open the nitrogen valve to reduce the gas concentration in the dust removal main pipe.

8. The ash unloading method of the blast furnace gravity dust collector ash unloading system according to claim 7, characterized in that: In step S2, the detection alarm device includes video monitoring and a second gas detector. The detection alarm device detects the ash unloading port in real time, collects video images and transmits them to the image acquisition preprocessing module system. After analog-to-digital conversion, the signals are input into the PLC centralized control system to participate in interlocking control. The second gas detector detects and collects the gas volume in the ash unloading area and participates in interlocking control.

9. The ash unloading method of the blast furnace gravity dust collector ash unloading system according to claim 8, characterized in that: The video surveillance monitors the ash volume levels in increasing order: L1, L2, and L3, thereby controlling the corresponding water control valve openings K2, K3, and K4; and adjusting the flow control valve openings S1, S2, and S3. When the second gas detector detects that the gas volume is greater than or equal to M3 for a long time, the ash unloading ball valve is interlocked and closed, and the interlock sound and light alarm responds to the alarm to prompt the on-site workers.

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