A blast furnace gas dedusting and purifying system capable of sealingly checking dust

Abstract

The utility model discloses a blast furnace gas dust removal purification system can carry out the sealing check ash, including dust remover, clean gas branch pipe line and clean gas back flushing branch pipe line, and clean gas branch pipe line is provided with check ash subassembly, and check ash subassembly includes gas valve, cloth bag check ash cup and check ash hose, and gas valve is set up in clean gas butterfly valve and clean gas blind plate valve medium, and one end of gas valve is connected with clean gas branch pipe line, and the other end is connected with the air inlet end of cloth bag check ash cup, one end of check ash hose is connected with the air outlet end of cloth bag check ash cup, and the other end is connected with the air inlet end of recovery valve, and the air outlet end of recovery valve is connected with clean gas back flushing branch pipe line. When checking ash, can open gas valve and recovery valve, make the clean gas after passing cloth bag check ash cup enter the back flushing ball valve rear end of clean gas back flushing branch pipe line, can avoid the coal gas pollution environment during checking ash process, and can reduce the waste of gas resources.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace gas recovery technology, and in particular to a blast furnace gas dust removal and purification system capable of sealing and ash detection. Background Technology

[0002] The blast furnace gas dust removal and purification system is used to filter and purify the raw gas with high temperature, high pressure and high dust concentration that is just discharged from the top of the blast furnace through the filter bag of the box to obtain clean gas, which is then recycled as a secondary energy source. At the same time, the recovered dust can also be used as sintering raw material.

[0003] In blast furnace production in steel enterprises, dry baghouse dust collection is the mainstream blast furnace gas purification process. In this process, ash inspection of the baghouse dust collector is a necessary step to ensure the gas purification effect. Its core purpose is to allow operators to quickly and safely check the blast furnace gas usage through the baghouse without shutting down the dust collector or opening large maintenance doors. However, when using existing ash inspection devices, the rear of the device, i.e., the rear of the filter bag, is open. When workers are inspecting ash on the filter platform, gas passes through the inspection device and is discharged through the inspection plate. This leads to gas leakage, not only causing a high gas concentration on the platform, exposing workers to a significant risk of carbon monoxide poisoning, but also resulting in some gas not being effectively recovered, posing safety hazards and energy waste. Utility Model Content

[0004] Therefore, it is necessary to provide a blast furnace gas dust removal and purification system that can perform sealed ash inspection, thereby preventing gas emissions during the ash inspection process, in order to address the aforementioned technical problems.

[0005] This utility model provides a blast furnace gas dust removal and purification system capable of sealing and dust removal, comprising: A dust collector is used to purify raw coal gas. The inlet of the dust collector is connected to the raw coal gas pipe of the blast furnace. The clean gas branch pipe is connected to the outlet of the dust collector at one end. The clean gas branch pipe is equipped with a clean gas butterfly valve, a dust checking component and a clean gas blind valve in sequence from one end of the dust collector outlet to the other end. The clean gas blind valve is connected to one end of the clean gas main pipe. The clean gas backflush branch pipeline is connected at one end to the outlet of the dust collector. The backflush branch pipeline is equipped with a backflush ball valve, a recovery valve and a backflush blind plate valve in sequence from one end of the dust collector outlet to the other end. The backflush blind plate valve is connected to one end of the clean gas backflush main pipeline. The ash detection assembly includes an air intake valve, a bag filter ash detection cup, and an ash detection hose. The air intake valve is located between the clean gas butterfly valve and the clean gas blind valve. One end of the air intake valve is connected to the clean gas branch pipe, and the other end is connected to the air inlet of the bag filter ash detection cup. One end of the ash-checking hose is connected to the outlet of the bag filter ash-checking cup, and the other end is connected to the inlet of the recovery valve. The outlet of the recovery valve is connected to the clean coal gas backflushing branch pipe.

[0006] In one embodiment, the clean gas main pipeline is equipped with a pressure regulating valve group and a TRT gas power generation component connected in parallel. The inlet end of both the pressure regulating valve group and the TRT gas power generation component is connected to the clean gas blind valve, and the outlet end of both the pressure regulating valve group and the TRT gas power generation component is used to connect to the clean gas collection device. The other end of the clean gas backflushing main pipeline is connected to the clean gas collection device.

[0007] In one embodiment, the raw coal gas pipeline is equipped with a raw coal gas butterfly valve and a raw coal gas blind valve, with the raw coal gas blind valve connected between the raw coal gas butterfly valve and the dust collector.

[0008] In one embodiment, the clean gas branch pipe is also equipped with a vent valve, which is connected to the gas outlet of the dust collector body.

[0009] In one embodiment, the pressure regulating valve assembly is provided with multiple pressure regulating valves connected in parallel.

[0010] The beneficial effects of this utility model are as follows: The blast furnace gas dust removal and purification system of this utility model, capable of sealed ash detection, has an intake valve positioned between the clean gas butterfly valve and the clean gas blind valve. One end of the intake valve is connected to the clean gas branch pipe, and the other end is connected to the inlet of the bag filter ash cup. One end of the ash detection hose is connected to the outlet of the bag filter ash cup, and the other end is connected to the inlet of the recovery valve. The outlet of the recovery valve is connected to the clean gas backflushing branch pipe. During ash detection, the intake valve and recovery valve can be opened, allowing the gas to pass through the bag filter ash cup and enter the backflushing ball valve of the clean gas backflushing branch pipe, thus preventing gas discharge and environmental pollution during ash detection. Furthermore, the clean gas backflushing branch pipe is connected to a clean gas collection device, ensuring that the gas passing through the bag filter during ash detection enters the clean gas collection device, reducing gas waste. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a blast furnace gas dust removal and purification system capable of sealing and ash removal, provided in an embodiment of this utility model.

[0012] Explanation of reference numerals in the attached drawings: 100, dust collector; 200, raw coal gas pipe; 210, raw coal gas butterfly valve; 220, raw coal gas blind valve; 300, clean coal gas branch pipe; 310, clean coal gas butterfly valve; 320, gas intake valve; 321, bag filter dust collector cup; 322, dust collection hose; 330, clean coal gas blind valve; 400, clean coal gas backflushing branch pipe; 410, backflushing ball valve; 420, recovery valve; 430, backflushing blind valve; 500, clean coal gas main pipe; 600, clean coal gas backflushing main pipe; 700, pressure regulating valve assembly; 800, TRT gas power generation assembly; 900, blast furnace; 910, clean coal gas collection device; 920, vent valve. Detailed Implementation

[0013] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0014] It should be noted that in the description of this utility model, "upper," "lower," "top," "bottom," and orientation or positional relationship are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] In one embodiment, such as Figure 1 As shown in this embodiment, a blast furnace gas dust removal and purification system capable of sealing and dust detection includes: A dust collector 100 is used to purify raw coal gas. The air inlet of the dust collector 100 is connected to the raw coal gas pipe 200 of the blast furnace 900. The dust collector 100 is equipped with a large number of filter bags inside, which can filter out gas ash from the raw coal gas.

[0016] The clean gas branch pipe 300 is connected at one end to the outlet of the dust collector 100. The clean gas branch pipe 300 is provided with a clean gas butterfly valve 310, a dust checking component and a clean gas blind valve 330 in sequence from one end of the outlet of the dust collector 100 to the other end. The clean gas blind valve 330 is connected to one end of the clean gas main pipe 500.

[0017] It should be noted that the main clean gas pipeline 500 is connected to the raw gas pipelines 200 of multiple blast furnaces 900. The clean gas butterfly valve 310 is used to regulate the flow rate of the clean gas branch pipelines 300, and the clean gas blind valve 330 is used when it is necessary to completely shut off the clean gas branch pipelines 300 for maintenance or other purposes.

[0018] The clean gas backflushing branch pipe 400 is connected at one end to the outlet of the dust collector 100. The backflushing branch pipe is equipped with a backflushing ball valve 410, a recovery valve 420 and a backflushing blind plate valve 430 in sequence from one end of the outlet of the dust collector 100 to the other end. The backflushing blind plate valve 430 is connected to one end of the clean gas backflushing main pipe 600.

[0019] The function of the clean gas backflushing branch pipe 400 is to use clean gas to backflush and clean the dust collector 100. The backflushing ball valve 410 is used to control the backflushing pressure when the clean gas is backflushing and depressurized. The backflushing blind plate valve 430 is used to completely close the clean gas backflushing branch pipe 400 during maintenance.

[0020] The ash detection assembly includes an air intake valve 320, a bag filter ash detection cup 321, and an ash detection hose 322. The air intake valve 320 is located between the clean gas butterfly valve 310 and the clean gas blind valve 330. One end of the air intake valve 320 is connected to the clean gas branch pipe 300, and the other end is connected to the air inlet end of the bag filter ash detection cup 321.

[0021] One end of the ash-checking hose 322 is connected to the air outlet of the bag ash-checking cup 321, and the other end is connected to the air inlet of the recovery valve 420. The air outlet of the recovery valve 420 is connected to the clean gas backflushing branch pipe 400.

[0022] Specifically, in this embodiment, the ash-filtering hose 322 is a metal hose, which has the characteristics of being resistant to coal gas corrosion and pressure resistance.

[0023] In one embodiment, the clean gas main pipeline 500 is equipped with a pressure regulating valve group 700 and a TRT gas power generation unit 800 connected in parallel. The inlet ends of both the pressure regulating valve group 700 and the TRT gas power generation unit 800 are connected to the clean gas blind valve 330, and the outlet ends of both are connected to the clean gas collection device 910. The other end of the clean gas backflushing main pipeline 600 is connected to the clean gas collection device 910. The pressure regulating valve group 700 is equipped with multiple pressure regulating valves connected in parallel.

[0024] The function of the pressure regulating valve group 700 is to convert the high-pressure coal gas discharged from the dust collector 100 into low-pressure clean coal gas. The low-pressure clean coal gas can be stored in a clean coal gas storage device or used directly.

[0025] In one embodiment, the raw coal gas pipeline 200 is equipped with a raw coal gas butterfly valve 210 and a raw coal gas blind valve 220, with the raw coal gas blind valve 220 connected between the raw coal gas butterfly valve 210 and the dust collector 100. The raw coal gas butterfly valve 210 is used to close or disable the gas filter device in the housing, and the raw coal gas blind valve 220 is used to close the raw coal gas pipeline 200 during maintenance or other processes.

[0026] In one embodiment, the clean gas branch pipe 300 is also equipped with a vent valve 920, which is connected to the gas outlet of the dust collector 100. The vent valve 920 is used to automatically or manually release a large amount of gas from the blast furnace 900 into the atmosphere when the pressure at the top of the blast furnace 900 is abnormally high or when an emergency occurs in the system, thereby relieving pressure and protecting the safety of the blast furnace 900 and the entire gas system.

[0027] The blast furnace gas dust removal and purification system capable of sealing and ash inspection in this embodiment includes three operating conditions: (1) Clean coal gas collection operation. The raw coal gas butterfly valve 210 and the raw coal gas blind plate valve 220 are open, the backflush ball valve 410, the gas intake valve 320 and the recovery valve 420 are closed, the clean coal gas butterfly valve 310 and the clean coal gas blind plate valve 330 are open, and the clean coal gas enters the clean coal gas collection device 910.

[0028] (2) Ash Inspection. Under the clean gas collection condition, open the gas intake valve 320 and the recovery valve 420. The gas on the clean gas branch pipe 300 enters the ash inspection cup through the gas intake valve 320, passes through the filter bag, and then enters the clean gas backflushing pipeline through the recovery valve 420 to the clean gas collection device 910. After the inspection is completed, close the gas intake valve 320 and the recovery valve 420, and remove the filter bag to confirm the ash inspection results.

[0029] (3) Backflushing cleaning mode. Based on the clean gas collection mode, close the clean gas butterfly valve 310, open the backflushing ball valve 410, and backflushing the clean gas in the clean gas collection device 910 to the dust collector 100 to backflushing clean the dust collector plates.

[0030] This utility model's sealed blast furnace gas dust removal and purification system has been applied to a steel plant. The plant has five blast furnaces (900 kilowatts) and a total of 51 dust collectors (100 kilowatts). Each dust collector (100 kilowatts) is checked once daily, with each unit's check taking 20 minutes. After adopting this system, each unit can recover 3 m³ of gas per check, resulting in a daily recovery of 153 m³ of gas per day for all 51 units. Based on a gas price of 0.1 yuan / m³, this translates to a daily energy saving of 15.3 yuan and an annual recovery of 55,845 m³ of gas, resulting in a cost saving of 5,584.5 yuan. Simultaneously, it completely eliminates the problem of gas leakage from the platform, eliminating the risk of gas poisoning for personnel during operation.

[0031] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A blast furnace gas dust removal and purification system capable of sealing and dust removal, characterized in that, include: A dust collector (100) for purifying raw coal gas, wherein the inlet of the dust collector (100) is connected to the raw coal gas pipe (200) of the blast furnace (900); A clean gas branch pipe (300) is connected at one end to the outlet of a dust collector (100). The clean gas branch pipe (300) is provided with a clean gas butterfly valve (310), a dust checking assembly and a clean gas blind valve (330) in sequence from one end of the outlet of the dust collector (100) to the other end. The clean gas blind valve (330) is connected to one end of the clean gas main pipe (500). A clean gas backflushing branch pipe (400) is connected at one end to the outlet of the dust collector (100). The backflushing branch pipe is provided with a backflushing ball valve (410), a recovery valve (420) and a backflushing blind plate valve (430) in sequence from one end of the outlet of the dust collector (100) to the other end. The backflushing blind plate valve (430) is connected to one end of the clean gas backflushing main pipe (600). The ash detection assembly includes an air intake valve (320), a bag filter ash cup (321), and an ash detection hose (322). The air intake valve (320) is located between the clean gas butterfly valve (310) and the clean gas blind valve (330). One end of the air intake valve (320) is connected to the clean gas branch pipe (300), and the other end is connected to the air inlet of the bag filter ash cup (321). One end of the ash-checking hose (322) is connected to the air outlet of the bag ash-checking cup (321), and the other end is connected to the air inlet of the recovery valve (420). The air outlet of the recovery valve (420) is connected to the clean coal gas backflushing branch pipe (400).

2. The blast furnace gas dust removal and purification system capable of sealing and dust inspection according to claim 1, characterized in that, The clean gas main pipeline (500) is equipped with a pressure regulating valve group (700) and a TRT gas power generation component (800) connected in parallel. The inlet end of the pressure regulating valve group (700) and the TRT gas power generation component (800) are both connected to the clean gas blind valve (330). The outlet end of the pressure regulating valve group (700) and the TRT gas power generation component (800) is used to connect to the clean gas collection device (910). The other end of the clean gas backflushing main pipeline (600) is connected to the clean gas collection device (910).

3. The blast furnace gas dust removal and purification system capable of sealing and dust inspection according to claim 2, characterized in that, The raw coal gas pipeline (200) is equipped with a raw coal gas butterfly valve (210) and a raw coal gas blind valve (220), and the raw coal gas blind valve (220) is connected between the raw coal gas butterfly valve (210) and the dust collector (100).

4. The blast furnace gas dust removal and purification system for sealing and ash removal according to claim 3, characterized in that, The clean gas branch pipe (300) is also equipped with a vent valve (920), which is connected to the gas outlet of the dust collector (100).

5. The blast furnace gas dust removal and purification system capable of sealing and dust inspection according to claim 4, characterized in that, The pressure regulating valve group (700) is provided with multiple pressure regulating valves connected in parallel.

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