CN102181871B - Heating and corrosion-prevention method for gas pipeline of hot blast stove - Google Patents

Heating and corrosion-prevention method for gas pipeline of hot blast stove Download PDF

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CN102181871B
CN102181871B CN2011100813696A CN201110081369A CN102181871B CN 102181871 B CN102181871 B CN 102181871B CN 2011100813696 A CN2011100813696 A CN 2011100813696A CN 201110081369 A CN201110081369 A CN 201110081369A CN 102181871 B CN102181871 B CN 102181871B
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heat
gas
corrosion
coal gas
hotblast stove
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CN102181871A (en
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候建
张福明
毛庆武
章启夫
姚轼
梅丛华
陈玉敏
银光宇
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Beijing Shougang International Engineering Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The invention discloses a heating and corrosion-prevention method for a gas pipeline of a hot blast stove, belonging to the technical field of blast-furnace iron making of the iron and steel industry. The blast-furnace gas communicated to the hot blast stove is heated up or maintains higher temperature by means of a saturated steam central heating method by a heating tower, so that the moisture condensation is prevented, and the corrosion is eliminated. The heating tower is additionally arranged between a residual pressure power generation or pressure reducing valve group and the hot blast stove firstly, so that the pressure- and temperature-reduced gases, which enter the residual pressure power generation or pressure reducing valve group through dry-process dedusting are divided into twopaths: one path of 40 to 45 percent of gas is sent to the hot blast stove for use and exchanges heat with saturated steam introduced by a steam pipe in the interior of the heating tower, and the temperature of the gas is increased to above 30 DEG C through heat exchanging of a heat pipe; and the heated gas is sent to the hot blast stove through a pipeline, and the pipeline is thermally insulated during the whole course to achieve the purpose of preventing corrosion. The invention has the advantages that: the pipe network corrosion problem is solved from the perspective of anti-condensation, the effect is remarkable, the investment is saved, the power consumption is little, and the production cost is low.

Description

Hotblast stove gas line heat temperature raising anti-corrosion method
Technical field
The invention belongs to the Iron And Steel Industry technical field of blast furnace ironmaking, a kind of hotblast stove gas line heat temperature raising anti-corrosion method particularly is provided, be applicable to the protection against corrosion of leading to the hotblast stove gas line in the coal gas dry-method dedusting technology.
Background technology
Blast furnace gas dry dusting is the new technology of a coal gas dust removal.Use high-temperature filter material to purify coal gas, be different from the traditional wet dedusting with filtering method.
Therefore advantages such as dry method dust has that gas quality is good, energy-conservation, water saving, environmental protection, occupation of land are little, reduced investment, expense are low are promoted rapidly, have bright development prospect.
This technology is since adopting at large blast furnace, and gaspipe network water of condensation corrosion pipeline phenomenon has appearred in the part blast furnace.Reason is that muriate has produced cl ions and strongly-acid in the coal gas in water of condensation, and pH value can reach 1～3.Corrosion occurs in and makes it the corrosion perforation on the stainless steel ripple expander, and the corrosion tube wall also jeopardizes valve even overbottom pressure turbine blade and casing, even can make the gaspipe network general corrosion, brings harm to production, is very important serious problems.
Etching problem also will be challenged to the feasibility of dry method dust as not understanding never but bring harm to production.Present solution route is to improve charge composition to reduce chloride content, piping insulation, spray sig water (or water spray) washing as far as possible, improve steel material, increase thickness of steel product, steel pipe inwall or measures such as valve contact surface brushing impregnating material and galvanic protection; That have even use the clean coal tracheae instead stainless steel and roll, be to have descended great strength in a word.Implement anti-corrosion measure at present in all its bearings, striven for effect.
If above-mentioned measure is feasible to be optimal, but still will pay a lot of costs: it is a very complicated thing that furnace charge changes; It is also very high that pipe material changes cost, changes 825 trades mark such as stainless steel ripple expander into from 316L, and cost significantly improves, and common iron increase Ni, Cr, Mo composition are not easy very much, or with stainless steel cost are increased; Water spray, spray alkali increase facility, have reduced caloric power of gas, and the dry method advantage is gone down.It is big to solve the etching problem technical difficulty in a word, of a high price, and how effect waits to observe.
Be spray alkali water spray in top pressure power generation (TRT) coal gas afterwards to the best protection against corrosion way of gaspipe network at present, remove muriate and improve strong acidic environment in the pipeline through washing.This method has been used for producing.
Moisture many, calorific value decline is everybody concerned issue after how avoiding hotblast stove with coal gas spray alkali.Existing patent is this part coal gas without spray alkali, but directly dedicated line is sent to hotblast stove.Prevent that the water of condensation separation method from being that gas line adopts steam jacket heating way that coal gas is heated up, thereby avoid dewing corrosion.Though but the feasible chuck of this method maybe be very long and heat interchanging area is little, therefore investment is big, difficulty of construction is big, the intensification weak effect.
Summary of the invention
The object of the present invention is to provide a kind of hotblast stove gas line heat temperature raising anti-corrosion method, solve the intensification problem preferably, its principle is: with concentrated heating means coal gas is heated up through the intensification tower is set.The intensification tower feeds 180 ℃～250 ℃ saturation steam and utilizes the adopting heat pipes for heat transfer principle that coal gas is heated up, and pipeline whole process is incubated outward, thereby gas temperature is remained on more than 70 ℃ to prevent that condensing of water from eliminating corrosion.The moisture comparatively high temps that keeps less of coal gas also helps the raising temperature of combustion.
Low-pressure saturated steam solves in iron and steel enterprise easily.Benefit is that saturation steam is separated out a large amount of heats of condensation (gasification latent heat) when the heat exchanging process condensation, so the many intensifications of heat are effective.The present invention does not pursue very high intensification effect, just has slightly by a small margin to promote to avoid dewfall to get final product.Owing to avoided higher calorific value being arranged to coal gas water spray (or alkali lye) so coal gas.
The present invention concentrates the way of heating to make towards the blast-furnace gas heating-up of hotblast stove through the intensification tower with saturation steam or keeps comparatively high temps, avoids dewfall, eliminates corrosion.Like Fig. 1; Shown in 2: at first between top pressure power generation (TRT) 2 or reducing valve group 3 and hotblast stove, set up intensification tower 4, make the coal gas after getting into top pressure power generation (TRT) 2 or reducing valve group 3 pressure and reduce with temperature through dry method dust 1 be divided into two-way: wherein one the tunnel is that 40%～45% coal gas is sent to the hotblast stove use; The saturation steam of this part coal gas and vapour pipe 6 feedings is carried out heat exchange in intensification tower 4 inside, utilize heat pipe heat exchanging, make coal gas heat up more than 30 ℃; Coal gas after the intensification is sent to hotblast stove through pipeline 5, and pipeline 5 complete stroke thermal insulatings are to reach the protection against corrosion purpose.Saturation steam is converted into water of condensation after with heat transferred coal gas, and water of condensation gets into condensate pipe 7 backs and reclaims through water of condensation bag 13, condensate pump 14 and drain valve 15.Entering pipe network 9 was transported to other users after all the other coal gas of 55%～60% got into spray column 8 spray alkali.Spray alkali technology is existing patent, and two technology solve dry method dust gas line etching problem jointly.
Intensification tower 4 is made up of the heat pipe of solid matter on steam pockets and the steam pockets; Saturation steam is passed to heat through heat pipe the coal gas in the drum outside.The solid matter fin is set to increase heat interchanging area on heat pipe.Insulation outside intensification tower to hotblast stove gas line is whole.
The present invention about 40%～45% coal gas is sent to hotblast stove through heating and insulation, and all the other coal gas of 55%～60% then need spray alkaline purification and get into pipe network then.Best pattern is that post-decompression coal gas gets into two towers respectively, and half is sent to hotblast stove after heating up; Get into plant area's pipe network behind the other semi-coal gas spray washing.Hotblast stove still is a dry gas with coal gas like this, and this treatment process investment is little, running cost is low, has alleviated the burden of sprinkling system.
This method intensification effect is obvious, can also bring benefit to gas-fired.In fact the heat of steam does not lose but is converted into useful work, can improve Combustion of Hot Air Furnace temperature and thermo-efficiency.
This is a better approach of dealing with problems, and has both kept the dry gas advantage also can eliminate corrosion, thereby has dissolved the great harm that possibly exist.
This output investment ratio is used for spray and will lacks, and the investment part has intensification tower, outer insulation, pipe valve and water gathering system etc., and power consumption and production management expense are also lacked than spray.Compare with current each item protection against corrosion work, technology is simple, and investment is low with energy consumption, and importantly it has solved etching problem from the source.
This work also has certain handiness, and steam needn't normal open, can consume to reduce according to the automatic steam regulation amount of coal gas self temperature.If the intensification effect is remarkable, bringing steam heat into hotblast stove has certain benefit, can continue to explore this gas preheating method.
Adopt the blast furnace of dry method dust much to have the corrosive pipeline problem, the present invention has solved the piping corrosion problem from the antisweat angle, is that an effect is remarkable, reduced investment, and power consumption is few, new departure that productive expense is low.
The intensification tower technology is ripe at present, and similar is in the hot pipe cooling facility, and is just more simple.Existing with a 2600m 3Blast furnace is an example, and all the coal gas amount is about 48X10 4m 3/ h is at present in order to prevent corrosion to need all spray alkaline purifications.
Hotblast stove is anticorrosion if adopt the technology of intensification of concentrating with gaspipe line, handles coal gas amount 20X10 4m 3/ h～22X10 4m 3It is one not a half that/h accounts for; All the other spray alkaline purification.
The intensification tower heats up by 30 ℃ of considerations, estimates the TRT temperature out is risen to 70 ℃～80 ℃ from 40 ℃～50 ℃, needs the about 5t/h of 1.0MPa saturation steam amount.
The intensification tower is similar with coal gas hot pipe cooling principle of device, and structure is simple many, and reason is:
1, adds the heating gas amount and only have whole 40%～45%;
2, intensification gets final product for 30 ℃, but not lowers the temperature 50 ℃ that require;
3, medium is that purified gas need not prevent dust, so heat exchanger is simple and efficient;
4, pressure is low, is ordinary steel structural container thereby manufacturing easily.Projected investment is merely about 30% of heat sink, and running cost is then than much lower with the spray alkali expense of amount coal gas.
The present invention is led to the gas line protection against corrosion of hotblast stove in order to solve decompression back coal gas.Second half coal gas that gets into low-pressure pipe network can use water spray, spray alkali method to solve no longer narration here.
Description of drawings
Fig. 1 concentrates heat temperature raising system figure.Wherein, blast furnace gas cloth bag dedusting device 1, top pressure power generation unit (TRT) 2, reducing valve group (sound damper) 3, intensification tower 4, hotblast stove are with gas exit pipeline 5, saturated steam pipe 6, condensate pipe 7, spray washing tower (for removing CO2) 7.
Fig. 2 is the steam heater fundamental diagram.Wherein, intensification tower 4, hotblast stove are with gas exit pipeline 5, saturated steam pipe 6, heat pipe 9, steam pockets 10, variable valve 11, purified gas inlet tube 12, water of condensation bag 13, condensate pump 14, drain valve 15.
Embodiment
The present invention concentrates the way of heating to make towards the blast-furnace gas heating-up of hotblast stove through the intensification tower with saturation steam or keeps comparatively high temps, avoids dewfall, eliminates corrosion.Like Fig. 1; Shown in 2: at first between top pressure power generation (TRT) 2 or reducing valve group 3 and hotblast stove, set up intensification tower 4, make the coal gas after getting into top pressure power generation (TRT) 2 or reducing valve group 3 pressure and reduce with temperature through dry method dust 1 be divided into two-way: wherein one the tunnel is that 40%～45% coal gas is sent to the hotblast stove use; The saturation steam of this part coal gas and vapour pipe 6 feedings is carried out heat exchange in intensification tower 4 inside, utilize heat pipe heat exchanging, make coal gas heat up more than 30 ℃; Coal gas after the intensification is sent to hotblast stove through pipeline 5, and pipeline 5 complete stroke thermal insulatings are to reach the protection against corrosion purpose.Saturation steam is converted into water of condensation after with heat transferred coal gas, and water of condensation gets into condensate pipe 7 backs and reclaims through water of condensation bag 13, condensate pump 14 and drain valve 15.Entering pipe network 9 was transported to other users after all the other coal gas of 55%～60% got into spray column 8 spray alkali.Spray alkali technology is existing patent, and two technology solve dry method dust gas line etching problem jointly.
As shown in Figure 1, half transports to hotblast stove through concentrating heating decompression back purified gas, gets into plant area's pipe network behind half spray alkali.
About half coal gas is sent to hotblast stove after heating up through the intensification tower.The heating principle is that saturation steam is emitted a large amount of heats of condensation at piece number 10 steam pocketss with the saturation steam condensation process and is used for adding heating gas.Water of condensation reclaims through part 13 water of condensation bags 14 condensate pumps 15 drain valves.In order to improve heat-transfer effect, heat pipe is established the ring fin of solid matter.Steam flow adopts adjustable way, can control steam valve 11 switchings or regulate flow according to gas temperature, accomplishes not only to keep temperature but also help practicing thrift steam.

Claims (4)

1. hotblast stove gas line heat temperature raising anti-corrosion method is concentrated the way of heating to make towards the blast-furnace gas heating-up of hotblast stove with saturation steam or is kept comparatively high temps through the intensification tower, avoids dewfall, eliminates corrosion; It is characterized in that; At first between top pressure power generation (2) or reducing valve group (3) and hotblast stove, set up intensification tower (4); Make the coal gas after getting into top pressure power generation (2) or reducing valve group (3) pressure and reduce with temperature through dry method dust (1) be divided into two-way: wherein one the tunnel is that 40%～45% coal gas is sent to the hotblast stove use; The saturation steam of this part coal gas and vapour pipe (6) feeding is carried out heat exchange in intensification tower (4) inside, utilize heat pipe heat exchanging, make coal gas heat up more than 30 ℃; Coal gas after the intensification is sent to hotblast stove through pipeline (5), and pipeline (5) complete stroke thermal insulating is to reach the protection against corrosion purpose; Saturation steam is converted into water of condensation after with heat transferred coal gas, and water of condensation gets into condensate pipe (7) back and reclaims through water of condensation bag (13), condensate pump (14) and drain valve (15); Another road is 55%～60% coal gas entering spray column (8), gets into pipe network (9) behind the spray alkali and transports to other users.
2. hotblast stove gas line heat temperature raising anti-corrosion method according to claim 1 is characterized in that described intensification tower (4) is made up of the heat pipe of solid matter on steam pockets and the steam pockets; Saturation steam is passed to heat through heat pipe the coal gas in the steam pockets outside.
3. hotblast stove gas line heat temperature raising anti-corrosion method according to claim 1 is characterized in that, the solid matter fin is set to increase heat interchanging area on heat pipe.
4. hotblast stove gas line heat temperature raising anti-corrosion method according to claim 1 is characterized in that, insulation outside intensification tower to hotblast stove gas line is whole.
CN2011100813696A 2011-04-01 2011-04-01 Heating and corrosion-prevention method for gas pipeline of hot blast stove Active CN102181871B (en)

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Publication number Priority date Publication date Assignee Title
CN104764649B (en) * 2015-03-31 2018-11-06 南京埃森环境技术有限公司 A kind of low-concentration flue gas detection pretreatment water-eliminating method and device and its flue gas inspection application system
CN107143725A (en) * 2017-07-20 2017-09-08 山东钢铁集团日照有限公司 A kind of equipment for reducing gas piping and valve erosion
CN107385128B (en) * 2017-09-15 2023-04-11 中冶赛迪工程技术股份有限公司 Blast furnace gas spraying deacidification method and device without reducing gas heat value
CN110274497A (en) * 2019-07-17 2019-09-24 韩景文 Eliminate the device that producer gas transportation system goes out containing phenol elutriation containing tar condensing
CN114181742A (en) * 2021-11-11 2022-03-15 北京铝能清新环境技术有限公司 Blast furnace gas source treatment system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101182957A (en) * 2007-11-27 2008-05-21 袁长胜 Air gas primary heater unit of hot-air stove

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Publication number Priority date Publication date Assignee Title
JPS4842521B1 (en) * 1968-08-22 1973-12-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101182957A (en) * 2007-11-27 2008-05-21 袁长胜 Air gas primary heater unit of hot-air stove

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JP昭48-42521B 1973.12.13

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