CN201168519Y - High temperature gas bag filter - Google Patents

Abstract

The utility model relates to a high-temperature gas bag type dust collector, which comprises a cylindrical dust collector housing, in which a cleaning room, a flower plate, a filter bag, a keel, an airflow guide plate, a filter room, an ash hopper and accompanying The heat and heat preservation device is equipped with a release device and a clean gas outlet on the top of the shell, an ash unloading valve and an ash conveying device at the bottom of the shell, and a pulse nitrogen injection device and a dusty gas inlet are installed on the shell. The filter bag is supported by the keel, the airflow guide plate is installed under the filter bag, and the filter chamber is placed under the airflow guide plate. The utility model is one of the main equipments in the high-temperature gas bag type dedusting system (referred to as BG dry dedusting system), which has various advantages required by the BG dry dedusting system. There is no problem of system blockage and secondary pollution of water. The equipment is easy to maintain and the cost is low. It realizes gas dust removal and recovery, and realizes converter negative energy steelmaking.

Description

High temperature gas bag filter

technical field

The utility model relates to high-temperature gas dedusting in steelmaking processes such as converters and calcium carbide furnaces in metallurgical steel plants, in particular to a bag-type dust collector used for high-temperature gas dedusting.

Background technique

At present, there are mainly two methods of dust removal and recovery in converters in steel mills: wet method (abbreviated as OG) and dry method (abbreviated as LT); the high temperature gas of calcium carbide furnace mainly adopts wet method for dust removal.

The converter gas wet dedusting device represented by OG is mainly composed of a secondary dedusting device and a dehydration device. The first stage adopts sizing or manual diameter-adjusting overflow venturi tube (abbreviated as a text) or spray cooling tower, which is used for cooling and coarse dust removal of raw converter gas. The second stage adopts automatic diameter-adjusting Venturi tube (referred to as Erwen) or annular seam scrubber (referred to as RSW), and its function is to remove dust from raw coal gas. The dehydration device is used to remove the gas moisture in the system. A considerable number of converter gas OG systems in China have the following conditions to varying degrees: high dust emissions (dust concentration in gas emissions exceeds 100mg/Nm ³ ); high energy consumption for equipment operation (system operating resistance exceeds 20kPa); high Operation and maintenance costs; low gas recovery per ton of steel (the average gas recovery per ton of steel is only about 50mg/Nm ³ ).

The converter gas dry dedusting device represented by LT is mainly composed of evaporative cooling tower, electrostatic precipitator and gas cooler. Although the LT dry dedusting system is obviously superior to OG in terms of gas dedusting and system energy consumption, but because the LT method needs to be imported from abroad, the investment cost 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 20 converters in the country, and more than 60 converters in the world have adopted the LT dry dust removal system.

In order to overcome the deficiencies of the OG and LT processes for converter gas dust removal and recovery in steel plants, a new BG dry dust removal process was proposed. In order to cooperate with the implementation of this new dust removal process, it is necessary to develop a high-temperature bag filter for converter gas.

Utility model content

The task of this utility model is to provide a high-temperature gas bag-type dust collector, which overcomes the shortcomings of the converter gas dust removal recovery process OG and LT, and solves the problem of the dust removal device matched with the new BG dry dust removal process.

The technical solution of the utility model is as follows:

A high-temperature gas bag-type dust collector, which includes a cylindrical dust collector housing, the housing is equipped with a clean room, a flower plate, a filter bag, a keel, an airflow guide plate, a filter room, an ash hopper, and heat tracing and Insulation device, set a release device and a clean gas outlet on the top of the shell, install an ash unloading valve and ash conveying device on the bottom of the shell, install a pulse nitrogen injection device and a dusty gas inlet on the shell; the filter bag is composed of a keel Support, the airflow guide plate is installed under the filter bag, and the filter chamber is placed under the airflow guide plate.

The high-temperature gas bag-type dust collector of the utility model is one of the main equipment in the high-temperature gas bag-type dust removal system (referred to as BG dry dust removal system), and has various advantages required by the BG dry dust removal system, and its dust removal efficiency is high. The running resistance and energy consumption are low, and there is no problem of system blockage and secondary pollution of water. It not only meets the strict environmental protection requirements, but also as one of the main equipment in the BG dry dust removal system, realizes gas dust removal and recovery, and realizes converter negative energy steelmaking.

The filter bag in the utility model is made of special high-temperature-resistant (above 230°C) filter material, which has high dust removal efficiency, and the dust concentration in gas emission is stable below 10mg/ ^Nm3 ; the operating energy consumption is low, and the resistance is below 1800Pa; The problem of system blockage and secondary pollution of water is easy to maintain and the cost is low; the bag filter can be arranged in parallel and reserved to meet the needs of offline maintenance of individual dust collectors.

Description of drawings

The accompanying drawing is a structural schematic diagram of a high-temperature gas bag-type dust collector of the utility model.

Detailed ways

Referring to the accompanying drawings, a high-temperature gas bag-type dust collector of the utility model is equipped with a cylindrical dust collector housing, and the housing is equipped with a cleaning room 4, a flower plate 6, a filter bag 7, a keel 8, and an airflow guide plate 9 , filter chamber 10, ash hopper 12 and heat tracing and insulation device 13. Installation of heat tracing and heat preservation device 13 is in order to prevent the ash hopper 12 from dew condensation, and add insulation on the ash hopper 12 outer walls simultaneously.

A diffuser 2 and a clean gas outlet 3 are arranged on the top of the housing. In order to prevent gas deflagration, an explosion relief valve 1 is also installed on the top of the housing. The ash unloading valve 16 and the ash conveying device 17 are arranged at the bottom of the housing. In order to ensure the safety of the equipment, especially the safety of the maintenance personnel entering the dust collector, a gas replacement device 15 is also installed at the bottom of the housing. A pulse nitrogen blowing device 5 and a dusty gas inlet 11 are installed on the housing.

The filter bag 7 is supported by a keel 8 . The airflow guide plate 9 is installed under the filter bag 7, and the filter chamber 10 is arranged under the airflow guide plate 9. The filter bag 7 is made of a special filter material that can withstand high temperatures above 230°C.

A nitrogen cannon 14 is provided at the ash hopper 12 to prevent the ash hopper from dust caking.

When the high-temperature gas bag-type dust collector of the utility model is working, the temperature of the gas after coarse dust removal and cooling from the dry dust removal system of the converter is controlled at about 230°C, and the high-temperature gas enters the high-temperature bag-type dust collector through the pipeline. When the dust-laden gas passes through the filter bag evenly from the outside to the inside, the dust is trapped on the outer surface of the filter bag and the clean gas passes through the filter bag. 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 nitrogen injection device to automatically clean the dust, and the dust is stripped and falls into the bottom ash hopper Discharged by pneumatic ash conveying device.

The high-temperature gas bag-type deduster of the utility model is suitable for dedusting high-temperature gas in steelmaking processes such as converters in metallurgical steel plants, and is also suitable for dedusting dry-process gas such as converters and calcium carbide furnaces.

The high-temperature gas bag-type dust collector of the utility model is especially suitable for the technical transformation of the existing converter gas LT system, and the following measures are mainly adopted: the electrostatic dust collector in the LT system is replaced by a high-temperature-resistant (above 230°C) bag-type dust collector, Increase the outlet gas temperature of the existing evaporative cooling tower, modify the control function of the system, etc.

The high-temperature gas bag-type dust collector of the utility model can also be applied to the overall technical transformation of the converter gas OG system, mainly adopting the following measures: adopting a dry-process bag-type dust removal system, replacing the OG dust-removal system with a high-temperature bag-type dust collector Erwen or RSW, replace the fan unit with lower power, modify the control function of the system, etc.

After the utility model is implemented, the dust concentration of gas discharge is below 10mg/Nm ³ , and the running resistance is below 1800Pa.

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 high-temperature gas bag type dust collector, which comprises a cylindrical dust collector housing, is characterized in that a clean room, flower plate, filter bag, keel, air flow guide plate, filter chamber, Ash hopper and heat tracing and heat preservation device, set release device and clean gas outlet on the top of the shell, install ash unloading valve and ash conveying device on the bottom of the shell, install pulse nitrogen injection device and dusty gas inlet on the shell; The filter bag is supported by the keel, the air flow guide plate is installed under the filter bag, and the filter chamber is arranged under the air flow guide plate. 2. The high-temperature gas bag-type dust collector according to claim 1, wherein an explosion relief valve is installed on the top of the housing. 3. The high-temperature gas bag-type dust collector according to claim 1, wherein a nitrogen cannon is provided at the ash hopper. 4. The high-temperature gas bag-type dust collector according to claim 1, characterized in that a gas replacement device is installed at the bottom of the housing. 5. The high-temperature gas bag-type dust collector according to claim 1, wherein the filter bag is made of high-temperature-resistant filter material.

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