CN112044224A - Deep treatment system and treatment method for high-temperature water-washed slag steam pollutants - Google Patents
Deep treatment system and treatment method for high-temperature water-washed slag steam pollutants Download PDFInfo
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- CN112044224A CN112044224A CN202010775227.9A CN202010775227A CN112044224A CN 112044224 A CN112044224 A CN 112044224A CN 202010775227 A CN202010775227 A CN 202010775227A CN 112044224 A CN112044224 A CN 112044224A
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- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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- B01D—SEPARATION
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
- F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
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- B01D2258/0283—Flue gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention provides a high-temperature water slag steam pollutant deep treatment system and a treatment method. The spraying liquid supply system comprises a filter, a sedimentation water tank, a booster water pump and a heat exchanger which are sequentially connected through a spraying water pipeline, a liquid collecting device is arranged below the spraying device, the inlet of the filter is connected with the outlet of the liquid collecting device, the spraying liquid supply system is suitable for comprehensive treatment of slag flushing steam generation areas such as a slag flushing port and a slag flushing pool of a blast furnace, the slag flushing steam of the blast furnace can be deeply purified, the discharge amount of acidic pollutants such as hydrogen sulfide and sulfur dioxide is reduced, the waste heat recycling of the slag flushing steam is realized, and the water consumption of the slag flushing system is greatly reduced.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of colored smoke plume purification in the metallurgical industry, in particular to a high-temperature water slag steam pollutant deep treatment system and a treatment method.
[ background of the invention ]
In the metallurgical industry, water is often used as a cooling medium in the cooling process of high-temperature slag generated by industrial furnaces such as iron and steel blast furnaces and converters, colored copper smelting furnaces and aluminum melting furnaces, such as a blast furnace slag water quenching process, a converter slag hot smoldering process or a hot splashing process. Taking a blast furnace as an example, about 80% of blast furnace slag is quenched with water. About 0.3-0.4 ton blast furnace slag is produced per ton pig iron, and about 9-10 ton slag flushing water is consumed per ton slag. The slag flushing water can evaporate a large amount of slag flushing steam at the moment of contacting the high-temperature slag and in the process of conveying the slag flushing water to the slag flushing tank, and takes away about 40 percent of heat of the high-temperature slag at the temperature of 80-100 ℃. In 2019, the blast furnace pig iron yield in China is 8.09 million tons, about 20 million tons of slag flushing water not only has a large amount of low-temperature waste heat resources, but also generates a large amount of low-pressure exhaust steam and dissipates about 0.85 million tons of slag flushing water. The discharged slag flushing steam contains a large amount of hydrogen sulfide, sulfur dioxide, hydrogen chloride, fiber cotton wool, silicate ultrafine particles and the like, and has great influence on the production environment. The water fog plume often exists in the production field, which harms the health of workers and causes serious corrosion to equipment and facilities in the blast furnace area. Therefore, the comprehensive treatment of the blast furnace slag flushing steam, the elimination of white smoke in a blast furnace area, the recovery of a large amount of water resources, the improvement of the environment of the blast furnace area, the weakening of the corrosion of production equipment and the reduction of pollutant emission become the problems of increasing attention of enterprises and society.
Since 2016, the requirements of treating colored smoke plume of industrial smoke in more than 30 provinces and cities and areas in China are met, and meanwhile, the practical conditions of severe haze and water resource shortage in northern areas of China further promote the technical progress in the field. For example, patent publication No. CN103060494B proposes a steam recovery type blast furnace slag flushing water system, which adopts a spraying mode to recover the exhaust steam generated at the slag flushing port, but does not consider smoke plume treatment and does not recover the exhaust steam of the slag flushing tank; patent publication No. CN208667759U proposes a system for dedusting, dehydrating and eliminating white slag of a blast furnace granulated water slag tower, wherein the key technology adopts GGH to carry out heat exchange treatment on slag flushing steam before and after condensation treatment, but GGH equipment has a great risk of corrosion, and visual pollution cannot be thoroughly eliminated in winter; patent publication No. CN208883918U proposes a slag flushing water elimination and waste heat utilization system, and the key technology of the system carries out condensation treatment on dead steam generated by a slag flushing pool, the treatment range is incomplete, and visual pollution cannot be thoroughly eliminated; patent publication No. CN209322919U proposes an environment-friendly white-eliminating treatment and waste heat utilization system for blast furnace slag, the key technology of the system is to use a heat exchanger and a spraying device in series to carry out condensation treatment on the waste steam of a slag flushing port and a slag flushing tank, but the spraying system needs to supplement a large amount of new water, and the visual pollution cannot be thoroughly eliminated without a heating system; patent publication No. CN209348354U proposes a blast furnace slag flushing flue gas whitening integrated device, and the key technology of the device only mixes and heats slag flushing steam and cannot achieve the pollutant purification effect; patent publication No. CN209910414U proposes a de-whitening device, the key technology of which is to adopt a water cooler and an air cooler series connection mode to treat high-temperature and high-humidity flue gas or steam, and the problem of low heat exchange efficiency of the air cooler exists; patent publication No. CN210206387U proposes a self-heating flue gas white elimination device, the key technology of which adopts a white elimination tower to sequentially arrange a reheater and an air cooler from top to bottom, the flue gas cooling and reheating white elimination do not need extra heat, but the reheater has a serious risk of corrosion, the air cooler consumes a large amount of gas, and the pipeline arrangement is too complex; the publication number CN110819747A provides a blast furnace slag flushing steam elimination and heat exchanger, the key technology of which only carries out condensation treatment on dead steam generated at a slag flushing port, and the problems of incomplete treatment range, large air condensation system, large air consumption and low heat source grade exist.
From the above analysis, although the prior art has provided methods for eliminating white slag and recovering waste heat of a blast furnace slag flushing system, various defects in different degrees and aspects still need to be improved, and it is necessary to develop a relatively complete, energy-saving, efficient, economic and reliable system and method for deeply treating high-temperature water slag flushing steam pollutants so as to meet the treatment requirements of the blast furnace slag flushing system.
[ summary of the invention ]
The invention aims to solve the problems in the prior art, provides a system and a method for deeply treating steam pollutants generated by high-temperature flushing slag, is suitable for treating steam generated by high-temperature slag treatment systems of a blast furnace, a converter, an aluminum melting furnace and the like, is particularly suitable for comprehensively treating flushing slag steam generation areas of a blast furnace flushing slag hole, a flushing slag pool and the like, can deeply purify flushing slag steam of the blast furnace, reduces the discharge amount of acidic pollutants such as hydrogen sulfide, sulfur dioxide and the like, realizes the recycling of waste heat of flushing slag steam, and greatly reduces the water consumption of a flushing slag system.
In order to achieve the purpose, the invention provides a high-temperature water slag steam pollutant deep treatment system which comprises a granulation tower, a slag flushing water inlet, a high-temperature slag inlet, a spraying device and a demister, wherein the slag flushing water inlet, the high-temperature slag inlet, the spraying device and the demister are sequentially arranged on a tower body of the granulation tower from bottom to top, the high-temperature water slag deep treatment system also comprises a spraying liquid supply system and a slag flushing pool, the spraying liquid supply system is connected with the spraying device, spraying water is provided for the spraying device through a spraying water pipeline C, the slag flushing pool is connected with the bottom tower wall of the granulation tower through a slag water ditch A, and the top side wall of the slag flushing pool is connected with the tower.
Preferably, the spraying liquid supply system is a spraying water circulation unit, the spraying water circulation unit comprises a filter, a sedimentation water tank, a booster water pump and a heat exchanger which are sequentially connected through a spraying water pipeline C, a liquid collecting device is arranged below the spraying device, the inlet of the filter is connected with the outlet of the liquid collecting device through the spraying water pipeline C, the top of the sedimentation water tank is connected with a dosing device through a medicament pipeline E and is used for loading alkaline medicaments, the spraying water outlet of the heat exchanger is connected with the spraying water inlet of the spraying device through the spraying water pipeline C, the bottom of the sedimentation water tank is connected with the slag flushing tank through a condensed water recovery pipeline D, and a movable sealing cover is arranged above the slag flushing tank. The heat exchange tube of the heat exchanger is preferably made of fluoroplastic materials, the tube diameter is 10-14 mm, the wall thickness is 0.8-1 mm, the heat exchange tube is arranged in a U-shaped roundabout mode, and cooling water of the blast furnace wall is preferably selected as a cold medium of the heat exchanger.
Preferably, the liquid collecting device is a liquid collecting tray, the liquid collecting tray is arranged between the high-temperature slag inlet and the spraying device, the outer diameter of the liquid collecting tray is smaller than the inner diameter of the granulating tower body, a gap for upward migration of slag flushing steam is formed between the outer side of the liquid collecting tray and the inner wall of the granulating tower body, a discharge pipe is arranged at the bottom of the liquid collecting tray, and the outlet of the discharge pipe is connected with the filter.
Preferably, the spraying layer of the spraying device is not less than three layers, the interlayer spacing is 3-5 m, and a plurality of nozzles are uniformly and densely distributed on each spraying layer.
Preferably, the system further comprises a hygrothermograph, wherein the hygrothermograph is arranged between the spraying device and the demister and is used for monitoring the temperature of the flushing slag steam after condensation in real time, and the temperature of the flushing slag steam after condensation is the temperature corresponding to the reduction of 50% of the moisture content of the flushing slag steam.
Preferably, the granulation tower further comprises an inclined plug and an explosion-proof valve, the inclined plug is arranged above the air induction port at the top of the granulation tower body, the inclined plug inclines upwards towards the air induction port, the included angle between the inclined plug and the horizontal direction is 30-45 degrees, and the explosion-proof valve is arranged on the inclined plug.
Preferably, the system also comprises a chimney, wherein the chimney is a smoke exhaust chimney of a blast furnace cast house environment dust removal system, one side of the bottom of the chimney is connected with an air induction port of the granulation tower body through a steam exhaust flue F, and a first exhaust fan is arranged on the steam exhaust flue F; and a smoke air channel G is arranged on the other side of the bottom of the chimney and is connected with a dust remover outlet of the blast furnace casting house environment dust removing system, and a second exhaust fan is arranged on the smoke air channel G.
Preferably, the liquid collecting device can be a steam-raising liquid collecting disc, the steam-raising liquid collecting disc is arranged between the high-temperature slag inlet and the spraying device, the steam-raising liquid collecting disc comprises a central baffle disc and a lower tray, the outer ring of the lower tray is arranged on the inner wall of the tower body of the granulation tower, an exhaust funnel extending upwards is arranged at the center of the lower tray, the section of the exhaust funnel is in a circular table shape gradually decreasing from bottom to top, a steam exhaust channel for flushing slag steam to migrate upwards is arranged in the exhaust funnel, the central baffle disc is positioned right above the steam exhaust channel, the outer ring of the central baffle disc is provided with a flow guide edge extending downwards, and the outer diameter of the central baffle disc is larger than the outer diameter of the outlet end of the steam exhaust channel.
Preferably, the spraying liquid supply system comprises a dosing device, a slag flushing water supplementing tank and a pressurizing water pump, the dosing device is connected with the top of the slag flushing water supplementing tank through a medicament pipeline E and used for loading an alkaline medicament, and the slag flushing water supplementing tank is connected with a spraying water inlet of the spraying device through the pressurizing water pump and a spraying water pipeline C.
The invention provides a method for deeply treating high-temperature water-washed slag steam pollutants, which comprises the following steps of:
s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet and slag flushing water from a slag flushing water inlet at the bottom of a granulation tower to generate high-temperature slag flushing steam; the mixture of the high-temperature slag and the slag flushing water is conveyed to a slag flushing pool through a slag water ditch A, and high-temperature slag flushing steam generated in the slag flushing pool flows back to the bottom of the granulation tower through a steam backflow pipeline B under the sealing action of a movable sealing cover above the slag flushing pool;
s2, high-temperature slag flushing steam generated at the bottom of the granulation tower moves upwards along the tower body of the granulation tower, cooling and condensation are carried out through a spraying device, and spraying water and precipitated condensed water are collected in a liquid collecting tray below the spraying device;
s3, enabling the condensed water and the spray water in the liquid collecting tray to enter a spray water circulating unit of a spray liquid supply system through a spray water pipeline C, and enabling the condensed water and the spray water to enter a precipitation water tank after passing through a filter; conveying the condensed water back to the slag flushing pool through a condensed water recovery pipeline D to carry out water supplementing operation; the spray water is subjected to waste heat recovery operation through a booster water pump and a heat exchanger through a spray water pipeline C, and then is conveyed back to the spray device for recycling;
s4, inputting an alkaline medicament into the precipitation water tank through a medicament pipeline E by the medicament adding device, and carrying out quenching and tempering operation to enable spray water to be alkalescent so as to remove acid pollutants contained in the slag flushing steam more efficiently in the spraying and cooling process;
s5, continuously moving slag flushing steam through the spraying device upwards along the tower body of the granulation tower, and carrying out demisting operation through a demister;
s6, continuously moving slag flushing steam passing through a demister upwards along a tower body of the granulation tower, entering a steam discharge flue F through an induced draft port, conveying to the bottom of a chimney under the action of a first exhaust fan, and uniformly mixing with hot flue gas at an outlet of a blast furnace casting house environment dust removal system to form unsaturated hot mixed gas;
s7, the unsaturated hot mixed gas moves upwards along the chimney and is discharged through a chimney outlet, and colored smoke plumes are not generated.
The invention has the beneficial effects that:
1. the invention relates to a complete treatment system and a complete treatment method for slag flushing steam generating areas such as a slag flushing port and a slag flushing pool of a blast furnace, and overcomes the defect of incomplete treatment range in the prior art.
2. The invention maximizes the efficiency of the heat exchange system by adopting the modes of spray condensation and mixed air reheating, realizes the deep condensation treatment of slag flushing steam, also realizes the complete elimination of colored smoke plume, and solves the problem of environmental protection.
3. According to the invention, the spraying water is subjected to alkaline medicament conditioning treatment through the dosing device, so that the acidic corrosion of equipment can be effectively prevented, the treatment of acidic pollutants such as hydrogen sulfide, sulfur dioxide and hydrogen chloride in the slag flushing steam by the spraying water is effectively promoted, and the emission of the pollutants is reduced.
4. The invention utilizes the blast furnace wall cooling water as the cold medium of the spray water heat exchanger, and effectively recovers the low-grade waste heat of the slag flushing steam.
5. The invention fully utilizes the hot flue gas exhausted by the blast furnace casting house environment dust removal system, or the hot flue gas exhausted by the blast furnace hot blast stove component as the reheating heat source of the condensed flushing slag steam, and the hot flue gas and the flushing slag steam condensed by the spraying device are uniformly mixed to form unsaturated hot mixed gas, no energy consumption is added in the reheating process, the colored smoke plume is thoroughly eliminated, and the environmental protection problem is solved.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a system diagram of a high-temperature water-washed slag vapor pollutant advanced treatment system in example 1.
FIG. 2 is a system diagram of the high-temperature water-washed slag vapor pollutant advanced treatment system in example 2.
FIG. 3 is a system diagram of the high-temperature water-washed slag vapor pollutant advanced treatment system in example 3.
In the figure: 1-a granulation tower, 2-a slag flushing water inlet, 3-a high-temperature slag inlet, 4-a liquid collecting tray, 41-a discharge pipe, 5-a spray device, 6-a hygrothermograph, 7-a demister, 8-an inclined plug, 9-an explosion-proof valve, 10-a slag flushing pool, 11-a movable sealing cover, 12-a spray water circulating unit, 121-a filter, 122-a precipitation water tank, 123-a booster water pump, 124-a heat exchanger, 13-a dosing device, 141-a first exhaust fan, 142-a second exhaust fan, 15-a chimney, 16-a slag flushing water replenishing water tank, 17-a steam lifting liquid collecting tray, 171-a central baffle tray, 172-a lower tray and 18-an induced draft port;
a-slag ditch, B-steam return pipeline, C-spray water pipeline, D-condensed water recovery pipeline, E-medicament pipeline, F-steam discharge flue and G-smoke flue.
[ detailed description ] embodiments
Example 1
Referring to fig. 1, the deep treatment system for the high-temperature water slag steam pollutants comprises a granulation tower 1, a slag flushing water inlet 2, a high-temperature slag inlet 3, a spraying device 5 and a demister 7 which are sequentially arranged on a tower body of the granulation tower 1 from bottom to top, and further comprises a spraying liquid supply system and a slag flushing pool 10, wherein the spraying liquid supply system is connected with the spraying device 5 and provides spraying water for the spraying device 5 through a spraying water pipeline C, the slag flushing pool 10 is connected with a tower wall at the bottom of the granulation tower 1 through a slag water ditch A, and the top side wall of the slag flushing pool 10 is connected with the tower wall of the granulation tower 1 through a steam backflow pipeline B.
Further, the spraying liquid supply system is a spraying water circulation unit 12, the spraying water circulation unit 12 comprises a filter 121, a settling water tank 122, a booster water pump 123 and a heat exchanger 124 which are sequentially connected through a spraying water pipeline C, a liquid collecting device is arranged below the spraying device 5, an inlet of the filter 121 is connected with an outlet of the liquid collecting device through the spraying water pipeline C, the top of the settling water tank 122 is connected with a dosing device 13 through a medicament pipeline E and used for loading alkaline medicaments, a spraying water outlet of the heat exchanger 124 is connected with a spraying water inlet of the spraying device 5 through the spraying water pipeline C, the bottom of the settling water tank 122 is connected with the slag flushing tank 10 through a condensed water recovery pipeline D, and a movable sealing cover 11 is arranged above the slag flushing tank 10.
Furthermore, the heat exchange tube of the heat exchanger 124 is made of fluoroplastic, the tube diameter is 10-14 mm, the wall thickness is 0.8-1 mm, the heat exchange tube is arranged in a U-shaped roundabout manner, and the cooling medium of the heat exchanger 124 is blast furnace wall cooling water.
Further, the liquid collecting device is a liquid collecting tray 4, the liquid collecting tray 4 is arranged between the high-temperature slag inlet 3 and the spraying device 5, the outer diameter of the liquid collecting tray 4 is smaller than the inner diameter of the granulating tower 1, a gap for upward migration of slag flushing steam is formed between the outer side of the liquid collecting tray 4 and the inner wall of the granulating tower 1, a discharge pipe 41 is arranged at the bottom of the liquid collecting tray 4, and the outlet of the discharge pipe 41 is connected with the filter 121.
Furthermore, the spraying layer of the spraying device 5 is not less than three layers, the interlayer spacing is 3-5 m, and a plurality of nozzles are uniformly and densely distributed on each spraying layer.
Further, still include warm and humid acidimeter 6, warm and humid acidimeter 6 set up in between spray set 5 and the defroster 7, warm and humid acidimeter 6 is used for the temperature of the sluicing steam after the real-time supervision condensation, the temperature that the temperature of the sluicing steam after the condensation corresponds for reducing sluicing steam moisture content 50%.
Further, the device also comprises an inclined plug 8 and an explosion-proof valve 9, wherein the inclined plug 8 is arranged above the air induction port 18 at the top of the tower body of the granulation tower 1, the inclined plug 8 inclines upwards towards the air induction port 18, an included angle between the inclined plug 8 and the horizontal direction is 30-45 degrees, and the explosion-proof valve 9 is arranged on the inclined plug 8.
Further, the system also comprises a chimney 15, wherein the chimney 15 is a smoke exhaust chimney of a blast furnace casting house environment dust removal system, one side of the bottom of the chimney 15 is connected with an air induction port 18 of the tower body of the granulation tower 1 through a steam exhaust flue F, and a first exhaust fan 141 is arranged on the steam exhaust flue F; and a smoke and air channel G is arranged on the other side of the bottom of the chimney 15 and is connected with a dust remover outlet of the blast furnace casting house environment dust removing system, and a second exhaust fan 142 is arranged on the smoke and air channel G.
A method for deeply treating high-temperature water-washed slag steam pollutants comprises the following steps:
s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet 3 and slag flushing water from a slag flushing water inlet 2 at the bottom of a granulation tower 1 to generate high-temperature slag flushing steam; the mixture of the high-temperature slag and the slag flushing water is conveyed to the slag flushing pool 10 through the slag water ditch A, and high-temperature slag flushing steam generated in the slag flushing pool 10 flows back to the bottom of the granulation tower 1 through the steam backflow pipeline B under the sealing action of the movable sealing cover 11.
S2, high-temperature slag flushing steam generated at the bottom of the granulation tower 1 moves upwards along the tower body of the granulation tower 1, cooling and condensation are carried out through a spraying device 5, and spraying water and precipitated condensed water are collected in a liquid collecting tray 4.
S3, the condensed water and the spray water in the liquid collecting tray 4 enter the spray water circulating unit 12 through a spray water pipeline C, pass through a filter 121 and then enter a precipitation water tank 122; conveying the condensed water back to the slag flushing pool 10 through a condensed water recovery pipeline D for water supplementing operation; the spray water is subjected to waste heat recovery operation through the pressurized water pump 123 and the heat exchanger 124 through the spray water pipeline C, and then is conveyed back to the spray device 5 for recycling.
S4, the dosing device 13 inputs an alkaline medicament into the precipitation water tank 122 through the medicament pipeline E to carry out quenching and tempering operations, so that the spray water is in alkalescence, and acid pollutants contained in the slag flushing steam can be removed more efficiently in the spraying and cooling process.
S5, the slag flushing steam passing through the spraying device 5 continuously moves upwards along the tower body of the granulation tower 1, and demisting operation is carried out through a demister 7.
S6, the slag flushing steam passing through the demister 7 continuously moves upwards along the tower body of the granulation tower 1, enters the steam discharge flue F through the air induction port 18, is conveyed to the bottom of the chimney 15 under the action of the first exhaust fan 141, and is uniformly mixed with hot flue gas at the outlet of the blast furnace casting house environment dust removal system to form unsaturated hot mixed gas.
S7, the hot mixed gas moves upwards along the chimney 15 and is discharged through an outlet of the chimney 15, and colored smoke plumes are not generated.
Example 2
Referring to fig. 2, the abatement system of the present embodiment is modified based on embodiment 1 as follows:
the liquid collecting tray 4, the filter 121, the settling water tank 122 and the heat exchanger 124 in the shower water circulating unit 12, and the condensed water recovery pipe D in example 1 are eliminated, and the pressurized water pump 123 in the shower water circulating unit 12 in example 1 is retained and the slag water replenishing tank 16 is newly added.
Specifically, the spraying liquid supply system comprises a dosing device 13, a slag flushing water supplementing tank 16 and a pressurizing water pump 123, wherein the dosing device 13 is connected with the top of the slag flushing water supplementing tank 16 through a medicament pipeline E and used for loading an alkaline medicament, and the slag flushing water supplementing tank 16 is connected with a spraying water inlet of the spraying device 5 through the pressurizing water pump 123 and a spraying water pipeline C.
The system management method of the embodiment 2 comprises the following processes:
s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet 3 and slag flushing water from a slag flushing water inlet 2 at the bottom of a granulation tower 1 to generate high-temperature slag flushing steam; the mixture of the high-temperature slag and the slag flushing water is conveyed to the slag flushing pool 10 through the slag water ditch A, and high-temperature slag flushing steam generated in the slag flushing pool 10 flows back to the bottom of the granulation tower 1 through the steam backflow pipeline B under the sealing action of the movable sealing cover 11.
S2, high-temperature slag flushing steam generated at the bottom of the granulation tower 1 moves upwards along the tower body of the granulation tower 1, cooling and condensation are carried out through a spraying device 5, spraying water and precipitated condensed water are collected at the bottom of the high-altitude granulation tower 1 and are conveyed to a slag flushing pool 10 together with a slag-water mixture through a slag ditch A; the slag flushing water replenishing tank 16 is connected with the booster water pump 123 and the water inlet of the spraying device 5 through a spraying water pipeline C, and provides spraying water for the spraying device 5.
S3, the dosing device 13 is connected with the top of the slag flushing water supplementing water tank 16 through a medicament pipeline E, and an alkaline medicament is input into the slag flushing water supplementing water tank 16 to make process water supplemented in alkalescence so as to remove acid pollutants contained in slag flushing steam more efficiently in the spraying and cooling process.
And S4, continuously moving the slag flushing steam passing through the spraying device 5 upwards along the tower body of the granulation tower 1, and carrying out demisting operation through a demister 7.
S5, the slag flushing steam passing through the demister 7 continuously moves upwards along the tower body of the granulation tower 1, enters the steam discharge flue F through the air induction port, is conveyed to the bottom of the chimney 15 under the action of the first exhaust fan 141, and is uniformly mixed with hot flue gas at the outlet of the blast furnace casting house environment dust removal system to form unsaturated hot mixed gas.
S6, the hot mixed gas moves upwards along the chimney 15 and is discharged through an outlet of the chimney 15, and colored smoke plumes are not generated.
Example 3
Referring to fig. 3, the abatement system of the present embodiment is modified based on embodiment 1 as follows:
firstly, the spray water and condensed water collecting device in embodiment 1 is the liquid collecting tray 4, and the vapor lifting liquid collecting tray 17 is used for replacement in this embodiment;
specifically, the liquid collecting device is a steam raising liquid collecting disc 17, the steam raising liquid collecting disc 17 is arranged between the high-temperature slag inlet 3 and the spraying device 5, the steam raising liquid collecting disc 17 comprises a central baffle disc 171 and a lower tray 172, the outer ring of the lower tray 172 is arranged on the inner wall of the granulation tower 1, an exhaust funnel extending upwards is arranged at the center of the lower tray 172, the section of the exhaust funnel from bottom to top is in a gradually-reduced circular table shape, a steam exhaust channel for flushing slag steam to move upwards is arranged in the exhaust funnel, the central baffle disc 171 is positioned right above the steam exhaust channel, the outer ring of the central baffle disc 171 is provided with a flow guide edge extending downwards, and the outer diameter of the central baffle disc 171 is larger than the outer diameter of the outlet end of the steam exhaust channel.
Secondly, the heat exchanger 124 in embodiment 1 adopts blast furnace wall cooling water as a cold medium to realize heat energy recovery; in the present embodiment, the cooling medium of the heat exchanger 124 is replaced by low-temperature air.
Thirdly, on the basis of the second embodiment, the heat exchange tube 124 of the heat exchanger in embodiment 1 is made of fluoroplastic, the tube diameter is 10-14 mm, the wall thickness is 0.8-1 mm, and the heat exchange tube is arranged in a U-shaped roundabout manner. The heat exchanger 124 in this embodiment may be replaced in a variety of ways: the heat exchange tube can be a metal finned tube, the tube diameter is not less than 38mm, the wall thickness is 3-5 mm, and the heat exchange tubes are arranged in a tube array manner; the heat exchange tube can be a titanium tube, the diameter of the tube is not less than 25mm, the wall thickness of the tube is 1-1.5 mm, and the heat exchange tubes are arranged in a tube type; or a fluoroplastic pipe with the pipe diameter not more than 50mm and the wall thickness of 1mm, and the heat exchange tubes are arranged in a tubular manner.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a high temperature water washed slag steam pollutant degree of depth treatment system which characterized in that: including granulation tower (1), set gradually towards slag water entry (2), high temperature sediment entry (3), spray set (5) and defroster (7) on the tower body of granulation tower (1) from bottom to top, still include and spray the liquid supply system and towards slag bath (10), spray the liquid supply system and link to each other with spray set (5), provide the shower water for spray set (5) through spray water pipeline C, towards slag bath (10) through slag ditch A with granulation tower (1) bottom wall of the tower is connected, towards slag bath (10) top lateral wall through steam backflow pipeline B with granulation tower (1) wall of the tower is connected.
2. The high-temperature water slag steam pollutant deep treatment system of claim 1, characterized in that: the spraying liquid supply system is a spraying water circulation unit (12), the spraying water circulation unit (12) comprises a filter (121), a precipitation water tank (122), a booster water pump (123) and a heat exchanger (124) which are sequentially connected through a spraying water pipeline C, a liquid collecting device is arranged below the spraying device (5), an inlet of the filter (121) is connected with an outlet of the liquid collecting device through the spraying water pipeline C, the top of the precipitation water tank (122) is connected with a medicine adding device (13) through a medicine pipeline E and used for loading alkaline medicines, a spraying water outlet of the heat exchanger (124) is connected with a spraying water inlet of the spraying device (5) through the spraying water pipeline C, the bottom of the precipitation water tank (122) is connected with the slag flushing tank (10) through a condensed water recovery pipeline D, a movable sealing cover (11) is arranged above the slag flushing tank (10), the cooling medium of the heat exchanger (124) is blast furnace wall cooling water.
3. The high-temperature water slag steam pollutant deep treatment system of claim 2, characterized in that: the liquid collecting device is a liquid collecting tray (4), the liquid collecting tray (4) is arranged between the high-temperature slag inlet (3) and the spraying device (5), the outer diameter of the liquid collecting tray (4) is smaller than the inner diameter of the granulating tower body (1), a gap for upward migration of slag flushing steam is formed between the outer side of the liquid collecting tray (4) and the inner wall of the granulating tower body (1), a discharging pipe (41) is arranged at the bottom of the liquid collecting tray (4), and the outlet of the discharging pipe (41) is connected with the filter (121).
4. The high-temperature water slag steam pollutant deep treatment system of claim 3, characterized in that: the spraying layer of the spraying device (5) is not less than three layers, the interlayer spacing is 3-5 m, and a plurality of nozzles are uniformly and densely distributed on each spraying layer.
5. The high-temperature water slag steam pollutant deep treatment system of claim 3, characterized in that: still include warm and humid acidimeter (6), warm and humid acidimeter (6) set up in between spray set (5) and defroster (7), warm and humid acidimeter (6) are used for the towards sediment steam temperature after the real-time supervision condensation.
6. The high-temperature water slag steam pollutant deep treatment system of claim 3, characterized in that: the granulation tower is characterized by further comprising an inclined plug (8) and an explosion-proof valve (9), wherein the inclined plug (8) is arranged above the air induction port (18) at the top of the tower body of the granulation tower (1), the inclined plug (8) inclines upwards towards the air induction port (18) and forms an included angle of 30-45 degrees with the horizontal direction, and the explosion-proof valve (9) is arranged on the inclined plug (8).
7. The high-temperature water slag steam pollutant deep treatment system of claim 6, characterized in that: the system is characterized by further comprising a chimney (15), wherein the chimney (15) is a smoke exhaust chimney of a blast furnace casting house environment dust removal system, one side of the bottom of the chimney (15) is connected with an air induction port (18) of the tower body of the granulation tower (1) through a steam discharge flue F, and a first exhaust fan (141) is arranged on the steam discharge flue F; and a smoke and air channel G is arranged on the other side of the bottom of the chimney (15) and connected with a dust remover outlet of the blast furnace casting house environment dust removing system, and a second exhaust fan (142) is arranged on the smoke and air channel G.
8. The high-temperature water slag steam pollutant deep treatment system of claim 2, characterized in that: the liquid collecting device is a steam raising and collecting tray (17), the steam raising and collecting tray (17) is arranged between the high-temperature slag inlet (3) and the spraying device (5), the steam raising and collecting tray (17) comprises a central baffle disc (171) and a lower tray (172), the outer ring of the lower tray (172) is installed on the inner wall of the granulation tower (1), the center of the lower tray (172) is provided with an exhaust funnel extending upwards, the cross section of the exhaust funnel is in a circular table shape gradually decreasing from bottom to top, a steam exhaust channel for flushing slag steam to migrate upwards is arranged in the exhaust funnel, the central baffle disc (171) is located right above the steam exhaust channel, the outer ring of the central baffle disc (171) is provided with a flow guide edge extending downwards, and the outer diameter of the central baffle disc (171) is larger than the outer diameter of the outlet end of the steam exhaust channel.
9. The high-temperature water slag steam pollutant deep treatment system of claim 1, characterized in that: the spraying liquid supply system comprises a dosing device (13), a slag flushing water replenishing tank (16) and a pressurizing water pump (123), wherein the dosing device (13) is connected with the top of the slag flushing water replenishing tank (16) through a medicament pipeline E and used for loading an alkaline medicament, and the slag flushing water replenishing tank (16) is connected with a spraying water inlet of the spraying device (5) through the pressurizing water pump (123) and a spraying water pipeline C.
10. The treatment method of the high-temperature water slag steam pollutant deep treatment system according to any one of claims 1 to 7, characterized by comprising the following steps of: the method comprises the following steps:
s1, carrying out slag flushing operation on high-temperature slag from a high-temperature slag inlet (3) and slag flushing water from a slag flushing water inlet (2) at the bottom of a granulating tower (1) to generate high-temperature slag flushing steam; the mixture of the high-temperature slag and the slag flushing water is conveyed to a slag flushing pool (10) through a slag water ditch A, and high-temperature slag flushing steam generated in the slag flushing pool (10) flows back to the bottom of the granulation tower (1) through a steam backflow pipeline B under the sealing action of a movable sealing cover (11) above the slag flushing steam;
s2, high-temperature slag flushing steam generated at the bottom of the granulation tower (1) moves upwards along the tower body of the granulation tower (1), cooling and condensation operation is carried out through a spraying device (5), and spraying water and precipitated condensed water are collected in a liquid collecting tray (4) below the spraying device (5);
s3, enabling the condensed water and the spray water in the liquid collecting tray (4) to enter a spray water circulating unit (12) of a spray liquid supply system through a spray water pipeline C, and enabling the condensed water and the spray water to enter a settling water tank (122) after passing through a filter (121); the condensed water is conveyed back to the slag flushing pool (10) through a condensed water recovery pipeline D for water supplementing operation; the spray water is subjected to waste heat recovery operation through a pressurized water pump (123) and a heat exchanger (124) through a spray water pipeline C, and then is conveyed back to the spray device (5) for recycling;
s4, inputting an alkaline medicament into the precipitation water tank (122) through a medicament pipeline E by the medicament adding device (13) to carry out conditioning operation so that spray water is weakly alkaline;
s5, continuously moving slag flushing steam passing through the spraying device (5) upwards along the tower body of the granulation tower (1), and carrying out demisting operation through a demister (7);
s6, continuously moving slag flushing steam passing through a demister (7) upwards along the tower body of the granulation tower (1), entering a steam discharge flue F through an air induction port (18), conveying to the bottom of a chimney (15) under the action of a first exhaust fan (141), and uniformly mixing with hot flue gas at the outlet of a blast furnace casting house environment dust removal system to form unsaturated hot mixed gas;
and S7, the unsaturated hot mixed gas moves upwards along a chimney (15) and is discharged through an outlet of the chimney (15).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112553387A (en) * | 2020-12-11 | 2021-03-26 | 浙江菲达环保科技股份有限公司 | Device and method for water quenching and smoke treatment of high-temperature metallurgical slag |
| CN113350980A (en) * | 2021-05-27 | 2021-09-07 | 中冶赛迪技术研究中心有限公司 | Energy-saving system for removing white slag of blast furnace and control method |
| CN114459248A (en) * | 2022-01-18 | 2022-05-10 | 安徽华铂再生资源科技有限公司 | Slag flushing process special for furnace |
| CN114908200A (en) * | 2022-05-24 | 2022-08-16 | 广东韶钢松山股份有限公司 | Blast furnace water quenching slag steam treatment device and slag steam treatment process |
| CN114931762A (en) * | 2022-05-16 | 2022-08-23 | 阳春新钢铁有限责任公司 | Method for closed smoke removal and slag flushing water recovery of blast furnace slag flushing ditch |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112553387A (en) * | 2020-12-11 | 2021-03-26 | 浙江菲达环保科技股份有限公司 | Device and method for water quenching and smoke treatment of high-temperature metallurgical slag |
| CN112553387B (en) * | 2020-12-11 | 2023-10-03 | 浙江菲达环保科技股份有限公司 | High-temperature metallurgical slag water quenching and smoke treatment device and method |
| CN113350980A (en) * | 2021-05-27 | 2021-09-07 | 中冶赛迪技术研究中心有限公司 | Energy-saving system for removing white slag of blast furnace and control method |
| CN114459248A (en) * | 2022-01-18 | 2022-05-10 | 安徽华铂再生资源科技有限公司 | Slag flushing process special for furnace |
| CN114931762A (en) * | 2022-05-16 | 2022-08-23 | 阳春新钢铁有限责任公司 | Method for closed smoke removal and slag flushing water recovery of blast furnace slag flushing ditch |
| CN114908200A (en) * | 2022-05-24 | 2022-08-16 | 广东韶钢松山股份有限公司 | Blast furnace water quenching slag steam treatment device and slag steam treatment process |
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