CN201023017Y - Converter gas wet bag purification recovery device - Google Patents

Abstract

The utility model relates to a wet bag purification and recovery device for converter gas, which comprises a vaporization flue, an evaporative cooler or a saturated spray tower, a wet bag filter, a gas water seal, a valve, a venting chimney and an automatic control device. The evaporative cooler or the saturated spray tower is connected with the vaporization flue through a dry-sealed flexible connection device instead of a water-sealed connection device. The evaporative cooler or saturated spray tower is connected with the wet bag filter through pipelines. The gas pipeline is connected to the back of the wet bag filter, and a Venturi flowmeter, a gas fan, a valve, a three-way switching valve, a vent chimney and a water seal valve are installed on the gas pipeline. The utility model has the advantages of high gas purification efficiency, low operating resistance and energy consumption of the device, high gas recovery, pipelines are not easily blocked, meets strict environmental protection requirements, achieves the purpose of recovering gas, and realizes converter negative energy refining steel.

Description

Converter gas wet bag purification recovery device

technical field

The utility model relates to a converter steelmaking production in a metallurgical steel plant, in particular to a high-temperature gas wet bag purification and recovery device in the converter steelmaking process.

Background technique

At present, the converter purification and recovery process in steel mills mainly adopts two methods: wet method (abbreviated as OG) and dry method (abbreviated as LT).

The converter gas wet purification device represented by OG is mainly composed of a secondary purification device and a dehydration device. The first stage: using sizing or manual diameter-adjusting overflow venturi tube (referred to as a text), its role is to cool down the raw gas and coarsely remove dust; the second stage: adopt an automatic diameter-adjusting venturi tube (abbreviated as two texts) or The annular seam scrubber (RSW for short) is used to remove dust from the raw coal gas; the dehydration device is used to remove the moisture in the pipeline gas. There are a considerable number of converter gas OG systems in China to varying degrees: high dust emission, the gas emission dust concentration exceeds 100mg/standard m ³ ; high equipment operation energy consumption, system operation resistance exceeds 20kPa; low ton steel gas Recovery, the average ton of steel gas recovery is only about 50 standard m ³ .

Converter gas dry purification devices represented by LT are mainly composed of evaporative coolers, electrostatic precipitators and gas coolers. Although the converter gas LT purification and recovery system is obviously superior to OG in terms of gas purification and system energy consumption, but because the LT method needs to import technology from abroad, the investment is relatively high, there are many failures of the electrostatic precipitator, and equipment research and operation experience, etc. It has affected the promotion and popularization. At present, there are only more than 10 converters in the country, and the gas of more than 50 converters in the world has adopted a dry purification recovery system.

Contents of the invention

The task of this utility model is to provide an improved converter gas wet bag purification and recovery device, which solves the problems of dust discharge and high energy consumption of equipment operation, low recovery of gas per ton of steel, and dry process existing in the wet process in the prior art. Need to introduce technology, high investment, many failures of electrostatic precipitator, etc.

The technical scheme of the utility model is as follows:

A converter gas wet bag purification and recovery device, which includes a vaporization flue, an evaporative cooler or a saturated spray tower, a wet bag dust collector, a gas water seal, a valve, a release chimney and an automatic control device, the evaporative cooler or saturated The spray tower and the vaporization flue are connected through a dry-sealed flexible connection device instead of a water-sealed connection device; the evaporative cooler or saturated spray tower is connected to the wet bag filter through pipelines; the wet bag The gas pipeline is connected to the back of the dust collector, and a Venturi flowmeter, a gas fan, a valve, a three-way switching valve, a vent chimney and a water seal valve are installed on the gas pipeline.

The advantages of the converter gas wet bag purification and recovery device of the utility model are that the gas purification efficiency is high, the operation resistance and energy consumption of the device are low, the gas recovery is high, and the pipeline is not easily blocked. The dust concentration of the purified gas discharge is below 10mg/standard m ³ , the operating resistance of the device is below 10kPa, and the recovery of gas from the converter per ton of steel is above 90 standard m ³ .

The wet bag purification and recovery device of the utility model meets strict environmental protection requirements, achieves the purpose of recovering gas, and realizes negative-energy steelmaking in a converter. The purification and recovery device can be applied to the gas purification and recovery of new converter projects, and can also be applied to the technical transformation of the existing converter gas OG or LT system.

Description of drawings

The accompanying drawing is a structural schematic diagram of a converter gas wet bag purification and recovery device of the present utility model.

The number 1 in the figure is the converter, 2 is the vaporization cooling flue, 3 is the dry seal flexible connection device, 4 is the evaporative cooler or spray tower, 5 is the wet pulse bag filter, 6 is the Venturi flow meter, and 7 is the gas Fan, 8 is the muffler, 9 is the bypass valve, 10 is the three-way switching valve, 11 is the water seal check valve, 12 is the V-shaped water seal valve, 13 is the chimney, 14 is sent to the gas tank, 15 is nitrogen Or steam, 16 is spray water, and 17 is gas pipeline.

Detailed ways

Referring to the accompanying drawings, the utility model is a converter gas wet bag purification and recovery device, which includes an evaporative cooler or a saturated spray tower 4, a wet pulse bag filter 5, a gas water seal, a Venturi flow meter 6, and a gas fan 7 , Valve and three-way switching valve 10, release chimney 13 and automatic control device.

The evaporative cooler or saturated spray tower 4 is connected to the evaporative cooling flue 2 through a dry-sealed flexible connection device 3, which replaces the water-sealed connection device in the prior art.

The utility model replaces the sizing or manual diameter-adjusting overflow venturi tube in the wet purification device with the evaporative cooler or the saturated spray tower 4; Adjustable diameter venturi tube is Erwen or circular seam scrubber is RSW, or electrostatic precipitator in dry purification device. The evaporative cooler or saturated spray tower 4 is connected with the wet bag filter 5 through pipelines.

The back of wet bag filter 5 is connected with gas pipeline 17, and Venturi flowmeter 6, gas blower 7, valve and three-way switching valve 10, diffuse chimney 13 and water seal valve are installed on gas pipeline 17. The valve installed on the gas pipeline 17 has the bypass valve 9 that is connected with the chimney 13 of releasing. The water seal valve installed on the gas pipeline 17 has a water seal check valve 11 and a V type water seal valve 12 .

In order to save power consumption, the induced draft fan is equipped with a hydraulic coupling or a frequency conversion motor for speed regulation, and it runs at a reduced speed during the non-blowing period. The outlet of the installed gas blower on the gas pipeline is equipped with a muffler 8, which can control the noise less than 85dB.

The evaporative cooler 4 is mainly composed of five parts such as the equipment body, spray gun, water supply and air supply system, and control system. Choose water, nitrogen or steam two-phase flow automatic nozzles to obtain stable fine water mist particles. According to the fluctuation of the converter gas temperature and gas volume, by spraying an appropriate amount of gas and water mist particles into the device, the water mist will be vaporized into water vapor in the device and enter the gas phase, and the temperature of the flue gas will be instantly reduced to the set temperature by using the latent heat of vaporization of water. At the same time, most of the coarse dust in the flue gas is removed and falls into the water-sealed ash hopper.

The wet pulse bag filter 5 is mainly composed of a dust collector shell, a wet filter bag, a pulse injection mechanism, a water-sealed ash hopper automatic sewage discharge device, a spray and flushing system, and a control system. The filter bag is made of air-permeable and impermeable film or coating material, with a layer of water film attached to the surface. When the dusty gas passes from the outside of the bag to the inside of the bag, the dust is trapped on the outer surface of the filter bag and the clean gas passes through. With the thickening of the dust layer on the outer surface of the filter bag, the running resistance of the dust collector increases. When the resistance reaches the upper limit of the set value, the control system starts the pulse injection nitrogen mechanism to automatically clean the dust, and the dust and mud are peeled off and fall into the water seal. Hopper.

The purification and recovery device of the utility model also has the following features: the micro differential pressure control of the converter furnace mouth is automatically controlled by the variable speed fan; the fan with lower power is used to replace the wet method fan with high power; Gas coolers in legal systems.

The working process of the converter gas wet bag purification and recovery device of the present utility model is as follows:

The high-temperature dust-containing gas produced by the converter in the metallurgical steel plant during the steelmaking process is cooled by the vaporization flue cooling system to reduce the temperature of the gas to 800°C-1000°C, and then enters the gas purification and recovery device. When the high-temperature dusty gas enters the evaporative cooler or the saturated spray tower through the dry-sealed flexible connection device, the gas and the water mist conduct heat and mass transfer, and at the same time the soot and the water mist collide and condense, so that most of the coarse dust is removed and Falling into the water-sealed ash hopper, the gas temperature drops rapidly to around 75°C. Then, the gas after cooling and coarse dedusting enters the wet bag filter through the pipeline, and after further water spray cooling treatment by the bag spraying device, the saturated gas enters the filter bag layer for purification. The purified gas has a dust concentration of less than 10 mg/standard m ³ , and is switched by a three-way switching valve according to the signals such as the gas composition measured by the gas analyzer, and is recovered or released respectively. The carbon monoxide content in the medium is not high, and it is discharged into the atmosphere after being burned through the chimney. During the recovery period, gas is sent into the gas cabinet through water-sealed valves such as water-sealed check valve, V-shaped water-sealed valve and gas main pipe.

The purification and recovery device of the utility model has the functions of automatic flushing and sewage discharge, and can automatically flush the dust and mud deposited in the gas dedusting pipeline at regular intervals; for the sludge and sewage deposited in the gas water seal and the water seal ash hopper of various equipment, Through each water-sealed automatic sewage discharge device and flushing system, it is discharged into the open channel of the factory or the sewage main to the sludge treatment station.

The purification and recovery device of the utility model can be applied to the gas purification and recovery of newly-built converter projects, and can also be applied to the comprehensive technical transformation of the existing converter gas OG system. Mainly take the following measures: use evaporative cooler or saturated spray tower to replace one article in the OG system, use dry-sealed flexible connection device instead of water-sealed connection device for the connection between vaporization flue and evaporative cooler or saturated spray tower, use wet cloth bag The dust collector replaces the Erwen or RSW in the OG system, replaces the fan unit with lower power, cancels the dehydrator in the OG system and modifies the control requirements of the system, etc. When used for segmental reconstruction, the main measures taken are: replace the Erwen or RSW in the OG system with a wet bag filter, replace the fan with a lower power, and cancel the dehydrator in the OG system and modify the control requirements of the system wait.

The purification and recovery device of the utility model can also be applied to the technical transformation of the existing converter gas LT system. Mainly take the following measures: replace the electrostatic precipitator in the LT system with a wet bag filter, cancel the gas cooler in the LT system, modify the control requirements of the system and check whether the fan unit needs to be replaced or only the fan, add water supply and drainage and sewage mud handling system, etc.

Of course, those skilled in the art should recognize that the above-mentioned embodiments are only used to illustrate the utility model, rather than to limit the utility model, as long as within the spirit of the utility model, the above implementation The changes and modifications of the examples will fall within the scope of the claims of the present utility model.

Claims (5)

1. a converter gas wet bag purification recovery device, it comprises vaporization flue, evaporative cooler or saturated spray tower, wet bag filter, gas water seal, valve, release chimney and automatic control device, it is characterized in that, The evaporative cooler or saturated spray tower is connected to the vaporization flue through a dry-sealed flexible connection device, replacing the water-sealed connection device; the evaporative cooler or saturated spray tower is connected to the wet bag filter through pipelines Connection; the gas pipeline is connected to the back of the wet bag filter, and a Venturi flowmeter, a gas blower, a valve, a three-way switching valve, a vent chimney and a water seal valve are installed on the gas pipeline. 2. The wet bag purification and recovery device for converter gas according to claim 1, wherein the valve installed on the gas pipeline has a bypass valve connected to the chimney. 3. The converter gas wet bag purification and recovery device according to claim 1, characterized in that the water-sealed valve installed on the gas pipeline has a water-sealed check valve. 4. The converter gas wet bag purification and recovery device according to claim 1, characterized in that the water seal valve installed on the gas pipeline has a V-shaped water seal valve. 5 . The converter gas wet bag purification and recovery device according to claim 1 , characterized in that the outlet of the gas blower installed on the gas pipeline is equipped with a muffler.

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