CN210287399U - Steelmaking converter primary flue gas particulate matter repurification system - Google Patents
Steelmaking converter primary flue gas particulate matter repurification system Download PDFInfo
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- CN210287399U CN210287399U CN201921171279.4U CN201921171279U CN210287399U CN 210287399 U CN210287399 U CN 210287399U CN 201921171279 U CN201921171279 U CN 201921171279U CN 210287399 U CN210287399 U CN 210287399U
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Abstract
The utility model discloses a flue gas particulate matter repurifying system of steelmaking converter, including steelmaking converter, the outer discharge line of a dust removal mechanism of converter and first gas, repurifying system still includes the gas chamber and carries out the repurifying mechanism that steam heat transfer takes off the bletilla and removes dust to the flue gas after the dust removal mechanism of a converter, and gas chamber, repurifying mechanism and first gas outer discharge line sweetgum fruit are connected through the gas outlet of flowing through gas transmission pipeline and a dust removal mechanism of converter. The utility model discloses to because of unqualified can not retrieve, carry out further repurification treatment through the cigarette (coal) gas that the chimney diffuses, realize economy, high-efficient target.
Description
Technical Field
The utility model belongs to the technical field of energy-concerving and environment-protective, concretely relates to steelmaking converter smoke particles system of repurifying.
Background
With the increasing severity of the environmental protection form, the environmental emission requirements are becoming more stringent. In terms of emission limit of primary flue gas particles of a steel converter in the steel industry, the requirement of the working scheme (survey) of ultralow emission modification of iron and steel enterprises, which is introduced by the ministry of environmental protection of the state, is as follows: steelmaking converter 1The emission limit of the particulate matters in the secondary flue gas is 50mg/Nm3Down to 10mg/Nm3The most strict requirement of emission limit in the world, is planned to be implemented nationwide before 2020, and some environment sensitive areas are produced and implement corresponding local standards of ultra-low emission at present.
Since the emergence of oxygen steelmaking converters in 1952, a converter flue gas purification and gas recovery process (a converter primary dedusting process) is an essential link for steelmaking production and serves as the functions of converter gas purification and recovery. Primary smoke particles of a steelmaking converter are the most important indexes for examining the primary dedusting technology of the converter, the primary smoke defined in the current GB28664-2012 'emission standard of atmospheric pollutants for steelmaking industry' means coal gas diffused due to unqualified converter steelmaking coal gas recovery, and the emission limit of the particles is 50mg/Nm3。
At present, the primary dedusting process of oxygen steelmaking converters at home and abroad mainly adopts a wet process (OG), a dry process (LT) and a semi-dry process, mainly comes from Germany and Japan, and corresponding technical conversion and domestic application are also carried out at home. For the wet process of primary dust removal, the emission value of the smoke particulate matters can be controlled to be 50mg/Nm3Left and right; the emission value of the dry method (LT) and the semi-dry method smoke particulate matters can be controlled to be 20mg/Nm generally3About 10mg/Nm cannot be satisfied3Ultra-low emission limits. How to adopt an economic and efficient means to realize the aim of ultralow emission of primary flue gas particles of a steel converter is a problem which must be faced and urgently needed to be solved by the domestic steel industry.
Therefore, the establishment of an economic and efficient system and method for purifying primary flue gas particles of a steelmaking converter again with ultralow emission has great significance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving the technical problem who exists among the prior art. Therefore, the utility model provides a steelmaking converter flue gas particulate matter repurification system once more, the purpose is convenient for externally discharge fume and purifies once more.
In order to realize the purpose, the utility model discloses the technical scheme who takes does:
the repurification system also comprises a gas tank and a repurification mechanism for carrying out steam heat exchange and de-aeration and dust removal on the flue gas generated after the primary dust removal mechanism of the converter removes dust, and the gas tank, the repurification mechanism and the first gas external discharge pipeline are connected with a gas outlet of the primary dust removal mechanism of the converter through a flow distribution gas pipeline.
The repurifying mechanism comprises a heat exchanger and a dust remover, wherein the air inlet of the heat exchanger is connected with the air outlet of the primary dust removing mechanism of the converter through a repurifying pipeline, the air outlet of the heat exchanger is connected with the air inlet of the dust remover, and the air outlet of the dust remover is connected with the second gas discharge pipeline.
And a first cut-off valve is arranged on the repurifying pipeline, and a second cut-off valve is arranged on the second gas discharge pipeline.
The first gas discharge pipeline and the second gas discharge pipeline are both connected with a chimney.
The converter primary dust removal mechanism comprises an evaporation cooling flue, a coarse dust removal tower, a fine dust removal mechanism, a cyclone dehydrator and an induced draft fan which are sequentially connected, wherein an air inlet of the evaporation cooling flue is connected with an air outlet of the steelmaking converter, and an air outlet of the induced draft fan is connected with an air inlet of the shunt gas pipeline.
The fine dust removal mechanism is a Venturi dust remover.
The reposition of redundant personnel gas-supply line is including reposition of redundant personnel gas-supply line and the three-way valve of locating on the reposition of redundant personnel gas-supply line, the reposition of redundant personnel gas-supply line is including reposition of redundant personnel intake pipe, reposition of redundant personnel recovery tube and reposition of redundant personnel outer calandria, and the air outlet of draught fan is connected with the air inlet of three-way valve through the reposition of redundant personnel intake pipe, and the gas chamber is connected with a gas outlet of three-way valve through reposition of redundant personnel recovery tube, and the outer pipeline of first gas outer.
The repurification system still includes locating the gas analysis instrument on the reposition of redundant personnel intake pipe.
The first gas external discharge pipeline comprises a first external discharge pipe and a bypass valve arranged on the first external discharge pipe.
The main purposes are that ① selective end pollution control mode is adopted, namely, only smoke (coal) pollutants discharged through a chimney are further purified, so that the purposes of strong pertinence, economy and high efficiency are achieved, ② re-purification system is designed according to field working conditions, is suitable for technical and working condition requirements of tiny particles, smoke (coal) gas low temperature, high dust removal efficiency under high water content, constant resistance, small occupied area and the like, and ③ has a whitening function, namely, the temperature of the discharged smoke (coal) gas is increased through an equipped steam heat exchanger, so that the whitening effect is achieved.
The utility model has the advantages that: the utility model discloses a repurifying mechanism guarantees that mechanical water vaporizes completely in the flue gas, realizes simultaneously that the fume emission takes off white function, realizes the further purification desorption to the micron order particulate matter through the dust remover again. The utility model discloses to because of unqualified can not retrieve, carry out further repurification treatment through the cigarette (coal) gas that the chimney diffuses, realize economy, high-efficient target.
Drawings
The description includes the following figures, the contents shown are respectively:
FIG. 1 is a process flow diagram of the purification system of the present invention.
Labeled as:
1-a steel converter; 2-vaporizing and cooling the flue; 3-a coarse dust removal tower; 4-fine dust removal mechanism; 5-cyclone dehydrator; 6-flue; 7-a draught fan; 8-gas analysis instrument; 9-three-way valve; 10-gas chamber; 11, a chimney; 12-a heat exchanger; 13-a dust remover; 14-front cut-off valve; 15-rear cut-off valve; 16-a bypass valve; 17-a split-flow air inlet pipe; 18-a split stream recovery pipe; 19-shunting the external drainage pipe.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation. It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention.
As shown in fig. 1, a re-purification system for primary flue gas particles of a steel converter comprises the steel converter 1, a primary converter dust removal mechanism and a first gas discharge pipeline, and further comprises a gas tank 10 and a re-purification mechanism for performing steam heat exchange and removal and dust removal on flue gas dedusted by the primary converter dust removal mechanism, wherein the gas tank 10, the re-purification mechanism and the first gas discharge pipeline are connected with a gas outlet of the primary converter dust removal mechanism through a flow distribution gas pipeline. The primary dedusting and recycling system of the converter mainly aims at cooling, purifying and recycling high-temperature and high-dust converter coal gas generated in the oxygen blowing and steel making process of the converter. The arrangement of the re-purification mechanism further re-purifies the discharged smoke (coal) pollutants, thereby achieving the purposes of strong pertinence, economy and high efficiency.
The repurifying mechanism comprises a heat exchanger 12 and a dust remover 13, wherein the air inlet of the heat exchanger 12 is connected with the air outlet of the primary dust removing mechanism of the converter through a repurifying pipeline, the air outlet of the heat exchanger 12 is connected with the air inlet of the dust remover 13, and the air outlet of the dust remover 13 is connected with a second gas discharge pipeline. And a first cut-off valve is arranged on the repurifying pipeline, the first cut-off valve is a front cut-off valve 14, a second cut-off valve is arranged on the second gas discharge pipeline, and the second cut-off valve is a rear cut-off valve 15. The first gas discharge pipeline and the second gas discharge pipeline are both connected with a chimney, so that the treated flue gas is conveniently discharged through the chimney. Specifically, the first gas external discharge pipe includes a first external discharge pipe and a bypass valve 16 provided on the first external discharge pipe. The second gas discharge pipeline comprises a second outer discharge pipe and a rear cut-off valve 15 arranged on the second outer discharge pipe.
The converter primary dust removal mechanism comprises an evaporation cooling flue 2, a coarse dust removal tower 3, a fine dust removal mechanism 4, a cyclone dehydrator 5 and an induced draft fan 7 which are connected in sequence, wherein an air inlet of the evaporation cooling flue 2 is connected with an air outlet of the steelmaking converter 1, and an air outlet of the induced draft fan 7 is connected with an air inlet of a shunting gas pipeline. The fine dust removal mechanism is preferably a venturi dust remover. High-temperature and high-dust converter smoke (coal) gas generated in the oxygen blowing and steel making process is sucked into a vaporization cooling flue with water-cooling coils distributed on the inner wall, and the temperature of the smoke gas is reduced from about 1600 ℃ to about 1000 ℃; entering a coarse dust removal tower (a spray tower), spraying, washing and cooling through a plurality of water nozzles, capturing and settling millimeter-sized particles by gravity, discharging the millimeter-sized particles out along with washing water, reducing the temperature of flue gas from about 1000 ℃ to about 65 ℃, entering a fine dust removal system (a Venturi dust remover), and realizing the capturing of the micron-sized particles by Venturi pressure difference control; then the flue gas enters a cyclone dehydrator, mechanical water in the flue gas is centrifugally separated by utilizing the centrifugal force principle, and the cyclone dehydrator is internally provided with an atomization cooling system, namely low-temperature purified water is atomized and sprayed into the dehydrator through a high-pressure nozzle to cool the temperature of the flue gas to about 40 ℃, so that the aims of reducing the saturated water content of the flue gas, reducing the working condition volume of the flue gas (improving the output of a fan) and further removing dust are fulfilled; the flue gas from the cyclone dehydrator enters a variable-frequency induced draft fan to be extracted and then is guided to the next process.
The diversion gas pipeline comprises a diversion gas pipeline and a three-way valve 9 arranged on the diversion gas pipeline, the diversion gas pipeline comprises a diversion gas inlet pipe 17, a diversion recovery pipe 18 and a diversion outer discharge pipe 19, an air outlet of an induced draft fan 7 is connected with an air inlet of the three-way valve 9 through the diversion gas inlet pipe 17, a gas chamber 10 is connected with one air outlet of the three-way valve 9 through the diversion recovery pipe 18, a first gas outer discharge pipeline and a second gas outer discharge pipeline are connected with the other air outlet of the three-way valve 9 through the diversion outer discharge pipe 19, in order to detect the component content in the gas after primary dust removal, a gas analysis instrument 8 is arranged on the diversion gas inlet pipe 17, a variable frequency induced draft fan outputs the flue gas in two ways through the three-way valve, one way enters the gas chamber for collection, the other way is discharged through a chimney, and the2When the content is more than 1 percent, the tee jointThe valve is in the chimney outward discharge state, and when the CO content is less than 30 percent (adjustable), the three-way valve is in the chimney outward discharge state ②.
The following is a detailed description of the components and functions of the system:
a steel converter: a basic oxygen furnace is a furnace that produces steel by top-blowing oxygen, i.e., a lance is used to blow high pressure oxygen into the furnace at the top of the furnace to enhance the steel-making process and improve bath stirring. Comprises a furnace body, a tilting system, an oxygen lance and an oxygen supply system. During the reaction of the high-pressure oxygen and the carbon in the molten iron in the converter, converter gas containing high CO and high dust at about 1600 ℃ is generated and is absorbed and treated by a primary dust removal and recovery system of the converter.
A vaporization cooling flue: the inner wall is provided with a water-cooling coil pipe, high-temperature and high-dust smoke (coal gas) generated in the blowing process of the converter is sucked, and cooling water in the water-cooling coil pipe is heated to generate steam which is collected and utilized.
A coarse dust removal tower: the cylindrical tower-shaped structure is sprayed, washed and cooled by a plurality of water nozzles arranged inside, millimeter-sized particles are captured by gravity and settled, and are discharged along with washing water, and the temperature of flue gas is reduced from about 1000 ℃ to about 65 ℃.
Cyclone dehydrator: the mechanical water in the flue gas is centrifugally separated by utilizing the centrifugal force principle. The device is internally provided with an atomization cooling system, namely, low-temperature purified water is atomized and sprayed into the dehydrator through a high-pressure nozzle, and the temperature of the flue gas is cooled to about 40 ℃.
Flue: the flue gas conveying connecting pipeline (comprises a gas conveying pipeline, a first outer discharge pipe, a second outer discharge pipe, a shunt gas inlet pipe, a shunt recovery pipe and a shunt outer discharge pipe in primary dust removal).
Frequency conversion draught fan: the flue gas is conveyed to the power source, adopts frequency conversion control.
Gas analysis instrument: on-line analysis of O in flue gas2And CO content, ① when O2When the content is more than 1%, the three-way valve is controlled to be in a chimney discharge (emission) state, when the content of CO is less than 30% (adjustable), the three-way valve is controlled to be in the chimney discharge (emission) state, and other stages are in a gas cabinet collection (recovery) state.
A three-way valve: the coal gas is divided into two paths, one path enters a gas cabinet for collection, and the other path is discharged outside through a chimney. When one path is unblocked, the other path is closed.
A gas cabinet: the gas tank collects converter smoke (coal) gas in a collecting (recovering) state.
A chimney: the pressure of the draught fan is utilized to convey and guide the smoke (coal) of the converter to be discharged outside.
A heat exchanger: the steam of about 200 ℃ is utilized, the finned tube is adopted to heat the flue gas to about 60 ℃, the complete vaporization of mechanical water in the flue gas is ensured, and the function of white removal in flue gas emission is realized.
A dust remover: the filter material adopts a plastic sintered plate, can resist the temperature of 100 ℃, realizes the further purification and removal of micron-sized particles, and has the automatic back flushing and flushing functions of nitrogen.
Front cut-off valve: the repurifying mechanism is opened when in use and is cut off when not in use.
Rear cut-off valve: the repurifying mechanism is opened when in use and is cut off when not in use.
Bypass valve: when the re-purification mechanism is used, the device is cut off.
As shown in fig. 1, the purification flow of the purification system: smoke (coal) gas that comes by steelmaking converter 1 gets into coarse dust removal tower 3 through vaporization cooling flue 2, gets into smart dust removal mechanism 4, cyclone dehydrator 5, frequency conversion draught fan 7 through flue 6 in proper order, and 7 exhaust smoke (coal) gas of frequency conversion draught fan divide two-way output through three-way valve 9: one path enters the gas chamber 10 through a shunt recovery pipe 18 (flue); the other branch is output by two branches: one branch is connected with a chimney 11 through a first gas discharge pipeline (flue) and a bypass valve 16; the other branch is connected to a chimney 11 through a re-purification pipeline (flue), a front cut-off valve 14, a heat exchanger 12, a dust remover 13, a rear cut-off valve 15 and a second gas discharge pipeline.
The smoke (coal) gas output of the primary smoke dust removal system of the steelmaking converter is divided into two states, namely ① recovery state when O in the smoke (coal) gas is in real time2When the content is less than 1% and the CO content is more than 30% (adjustable), the smoke (coal) gas is guided to a gas chamber for recovery through a three-way valve, and ② is in a release state when O in the smoke (coal) gas is in a real-time O-containing state2When the content is more than 1% or the CO content is less than 30% (adjustable), the smoke (coal) gas is led through a three-way valveLeading the smoke dust to be diffused and discharged.
The once smoke particulate matter repurifying system of the steelmaking converter aims at a diffusing state and ensures that the dust content is about 50mg/Nm3The smoke (coal) gas is not discharged directly into chimney, but is further purified by re-purification system composed of heat exchanger and dust remover, etc. to reduce dust content to 10mg/Nm3After the discharge is finished, the ultra-low emission target is realized through the discharge of a chimney.
The main control parameters for realizing ultra-low and whitening effect are that ① cyclone dehydrator is equipped with atomizing cooling system, i.e. low-temperature purified water is atomized and sprayed into dehydrator by high-pressure nozzle, the temperature of cooling flue gas is from about 65 deg.C to about 40 deg.C, so that the saturated water content in flue gas (coal gas) is from 160g/m3The above is reduced to 50g/m3The method comprises the steps of firstly, heating flue gas (coal) by a finned tube at about 200 ℃ by using steam at about 200 ℃ in an ② heat exchanger, raising the temperature of the flue gas (coal) from about 40 ℃ to about 60 ℃ to ensure that mechanical water in the flue gas is completely vaporized and is in an overheated state, realizing the function of removing white matter in flue gas emission, and further purifying and removing micron-sized particles by using a filter material in a ③ dust remover by using a plastic burning plate with the temperature resistance up to 100 ℃, thereby having the functions of automatic nitrogen back blowing and flushing.
The back-blowing and flushing functions of the dust remover adopt an automatic control mode, are interlocked with the automatic control of primary flue gas dust removal of the original steel-making converter, and carry out periodic back-blowing and flushing when the three-way valve is in a recovery state or the variable-frequency induced draft fan is in a stop state.
The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.
Claims (9)
1. The repurification system for the primary smoke particles of the steelmaking converter comprises the steelmaking converter, a primary converter dust removal mechanism and a first gas discharge pipeline and is characterized by further comprising a gas cabinet and a repurification mechanism for performing steam heat exchange and removal and dust removal on smoke subjected to dust removal by the primary converter dust removal mechanism, wherein the gas cabinet, the repurification mechanism and the first gas discharge pipeline are connected with a gas outlet of the primary converter dust removal mechanism through a flow distribution gas pipeline.
2. The steelmaking converter primary flue gas particulate matter repurification system as recited in claim 1, wherein said repurification mechanism includes a heat exchanger and a dust remover, the gas inlet of the heat exchanger is connected with the gas outlet of the converter primary dust removal mechanism through a repurification pipeline, the gas outlet of the heat exchanger is connected with the gas inlet of the dust remover, and the gas outlet of the dust remover is connected with the second gas discharge pipeline.
3. The steelmaking converter primary flue gas particulate matter repurification system as claimed in claim 2, wherein said repurification pipeline is provided with a first cut-off valve, and said second gas discharge pipeline is provided with a second cut-off valve.
4. The steelmaking converter primary flue gas particulate matter re-purification system as recited in claim 2, wherein said first gas discharge pipeline and said second gas discharge pipeline are both connected to a chimney.
5. The steelmaking converter primary flue gas particulate matter repurification system as recited in claim 1, wherein said converter primary dust removal mechanism includes an evaporation cooling flue, a coarse dust removal tower, a fine dust removal mechanism, a cyclone dehydrator and an induced draft fan connected in sequence, an air inlet of said evaporation cooling flue is connected with an air outlet of the steelmaking converter, and an air outlet of said induced draft fan is connected with an air inlet of the diversion gas pipeline.
6. The steelmaking converter primary flue gas particulate matter repurification system of claim 5, wherein said fine dust removal mechanism is a venturi scrubber.
7. The steelmaking converter primary flue gas particulate matter repurification system as claimed in claim 5, wherein the diversion gas transmission pipeline includes a diversion gas transmission pipe and a three-way valve disposed on the diversion gas transmission pipe, the diversion gas transmission pipe includes a diversion gas inlet pipe, a diversion recovery pipe and a diversion outer discharge pipe, the air outlet of the induced draft fan is connected with the air inlet of the three-way valve through the diversion gas inlet pipe, the gas holder is connected with one air outlet of the three-way valve through the diversion recovery pipe, and the first gas outer discharge pipeline and the second gas outer discharge pipeline are connected with the other air outlet of the three-way valve through the diversion outer discharge pipe.
8. The steelmaking converter primary flue gas particulate matter repurification system of claim 7, wherein said repurification system further includes a gas analyzer disposed on the split-flow inlet pipe.
9. The steelmaking converter primary flue gas particulate matter re-purification system as recited in claim 1, wherein said first gas outward discharge pipe includes a first outward discharge pipe and a bypass valve disposed on the first outward discharge pipe.
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| CN201921171279.4U CN210287399U (en) | 2019-07-24 | 2019-07-24 | Steelmaking converter primary flue gas particulate matter repurification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241284A (en) * | 2019-07-24 | 2019-09-17 | 马鞍山钢铁股份有限公司 | A kind of flue gas particles of steelmaking converter purification system and purification method again |
| CN112280928A (en) * | 2020-10-12 | 2021-01-29 | 首钢京唐钢铁联合有限责任公司 | Purification method before starting converter vaporization cooling system pipeline |
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2019
- 2019-07-24 CN CN201921171279.4U patent/CN210287399U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241284A (en) * | 2019-07-24 | 2019-09-17 | 马鞍山钢铁股份有限公司 | A kind of flue gas particles of steelmaking converter purification system and purification method again |
| CN112280928A (en) * | 2020-10-12 | 2021-01-29 | 首钢京唐钢铁联合有限责任公司 | Purification method before starting converter vaporization cooling system pipeline |
| CN112280928B (en) * | 2020-10-12 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Purification method before starting converter vaporization cooling system pipeline |
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