CN202581258U - All-burned blast furnace gas boiler - Google Patents

All-burned blast furnace gas boiler Download PDF

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Publication number
CN202581258U
CN202581258U CN 201220183407 CN201220183407U CN202581258U CN 202581258 U CN202581258 U CN 202581258U CN 201220183407 CN201220183407 CN 201220183407 CN 201220183407 U CN201220183407 U CN 201220183407U CN 202581258 U CN202581258 U CN 202581258U
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CN
China
Prior art keywords
superheater
furnace gas
furnace
gas boiler
economizer
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Expired - Lifetime
Application number
CN 201220183407
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Chinese (zh)
Inventor
侯晓东
周勇
付宁文
王波
田东明
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Xizi Clean Energy Equipment Manufacturing Co ltd
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Hangzhou Boiler Group Co Ltd
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Priority to CN 201220183407 priority Critical patent/CN202581258U/en
Application granted granted Critical
Publication of CN202581258U publication Critical patent/CN202581258U/en
Anticipated expiration legal-status Critical
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Abstract

The utility model discloses an all-burned blast furnace gas boiler. Compared with the traditional all-burned blast furnace gas boiler technology, the all-burned blast furnace gas boiler disclosed by the utility model has the advantages that a convection evaporator is additionally arranged between a low-temperature overheater and a superior coal economizer, and therefore, the technical problem of overhigh boiling degree of the superior coal economizer in the prior art is solved under the condition of not increasing the size of a hearth; and the common separating-type heat pipe gas preheater is replaced by a feedwater heater which is simple in system and low in cost, and therefore the technical problem of high exhaust gas temperature is solved. The all-burned blast furnace gas boiler can be used for overcoming the defect of heat absorption capacity of the all-burned blast furnace gas boiler hearth and reducing the boiling degree of the superior coal economizer and the exhaust gas temperature and can achieve the purposes of ensuring the running safety of the coal economizer, improving the boiler efficiency and reducing the boiler cost.

Description

The fully burning blast-furnace gas boiler
Technical field
The utility model belongs to the recovery of Ferrous Metallurgy secondary energy sources, boiler technology field, particularly a kind of fully burning blast-furnace gas boiler.
Background technology
Chinese large-sized iron and steel enterprise energy consumption per ton steel is higher by 10% than developed country at present, and medium-sized and small enterprises' energy consumption per ton steel is higher by 25% than developed country, has greatly influenced the competitiveness and the ability of sustainable development of China's steel and iron industry.This wherein; The level that by-product gas in the steel smelting procedure is recycled is low to be a very important factor, and the total energy approach of " three gas " (blast furnace gas, coal gas of converter, coke-stove gas) is to realize energy-saving and cost-reducing breach in the iron and steel enterprise.Blast furnace gas is a kind of byproduct in the blast furnace ironmaking process, in blast furnace, is changed through gasification back and get by coke, owing to flammable composition in its composition is few; Be merely 20~30% carbon monoxide and small amount of carbon hydrogen compound; All the other are not flammable composition, and wherein nitrogen accounts for 55%, so calorific capacity is very low.The blast furnace gas calorific capacity of general small furnace is 3344~3756kJ/Nm 3Big blast furnace is because coke ratio is advanced, and calorific value is also low, generally is merely 3000kJ/Nm 3About.In steel mill's three gas, though blast furnace gas fuel gas content is minimum, its discharge capacity is maximum.According to statistics, in " three gas " secondary energy sources total amount, blast furnace gas accounts for 64%, and coke-stove gas accounts for 29%, and coal gas of converter accounts for 7%; From whole enterprise, the blast furnace gas contained energy accounts for 18~24% of iron and steel enterprise's gross energy.Therefore, effective utilization of blast furnace gas is the energy-saving and cost-reducing most important thing of iron and steel enterprise.Under China steel enterprise prior art level, can only use up 40% ~ 50% blast furnace gas of blast furnace self hot-blast stove, remainder to the sky discharging, not only wastes energy basically, and contained CO and CH in the blast furnace gas 4Also can cause great pollution Deng gas to environment.If can utilize this part blast furnace gas that diffused originally to carry out combustion power generation; Both solved the pollution of CO; Reclaimed secondary energy sources again, increased electric power, be significant for the competitiveness of reduction iron and steel enterprise energy consumption, enhancing iron and steel enterprise, the sustainable development of assurance iron and steel enterprise.
Since the eighties in last century, Iron and Steel Enterprises in China progressively rises to the level of utilizing of blast furnace gas more than needed, from blast furnace gas being used for coal, coke-stove gas, coal gas of converter multifuel combustion production steam or making heating furnace fuel, develops into the fully burning blast-furnace gas generating.Fully burning blast-furnace gas boiler generation technology is to utilize the new technology that a large amount of low combustion value furnace gas generate electricity in the iron and steel enterprise; Can increase and decrease the use amount of blast furnace gas and not influence the safe operation of boiler through the adjustment generation load in actual use; Both effectively utilize the blast furnace gas resource, stablized the fluctuation of coal gas system pipe network again as interruptible customer.Development HTHP, efficient, safe, stable fully burning blast-furnace gas boiler are the keys of blast furnace gas generation technology., characteristics such as theoretical temperature combustion low, catch fire difficulty, exhaust gas volumn big low to blast furnace gas calorific value; Domestic-developed the boiler technology of a series of fully burning blast-furnace gas, as " high temperature high pressure electric power station boiler of fully burning blast-furnace gas " (ZL97203451.X), " asymmetric waisting double chamber furance thorax pure burning blast-furnace gas boiler " (ZL200920080259.6), " a kind of medium temperature and medium pressure steam boiler of fully burning blast-furnace gas " (ZL 200910062806.2).These technology have solved the fully burning blast-furnace gas boiler problems such as difficulty, fire box temperature are low, combustion instability of catching fire; Through being set, high boiling degree economizer partly solved because of the not enough problem of evaporation caloric receptivity in the low stove that brings of blast furnace gas calorific value, for contribution has been made in the popularization of fully burning blast-furnace gas generation technology.In actual motion, find; Because blast furnace gas calorific value fluctuation or drum steam clean moisture stream reduce the water yield that gets into the high temperature section economizer, often make high temperature section economizer boiling degree surpass 20%, even reach 25%; Make that the flow resistance of economizer is excessive and make the too much electric energy of feed pump consumption; Simultaneously high boiling degree also makes the pressure of working medium in the economizer increase, and the safe operation of economizer is threatened, and the case of pipe explosion accident generation is arranged.Spend height for solving the economizer boiling, often adopt the measure that strengthens size of burner hearth, increases the burner hearth heat absorption in the design, steel consumption and floor space are increased, improved the cost of boiler but strengthen size of burner hearth.Simultaneously, because blast furnace gas calorific value is low, and the superpressure boiler feed temperature is high, and about about 240 ℃, and blast furnace gas boiler burning required air quantity reason such as less again, cause blast furnace gas boiler air preheater exit gas temperature all about 200 ℃.Be to solve the high problem of exhaust gas temperature, often be employed in the scheme that installs separate heat pipe gas preheating device behind the air preheater additional, (ZL97203451.X) like " high temperature high pressure electric power station boiler of fully burning blast-furnace gas ".But separate heat pipe gas preheating device complex structure, and compare costliness, increased the cost of boiler.
Summary of the invention
The purpose of the utility model provides a kind of fully burning blast-furnace gas boiler; Under the situation that does not increase the boiler furnace size, it is not enough to remedy the boiler furnace caloric receptivity, reduces higher level's economizer caloric receptivity; Reduce higher level's economizer boiling degree, adopt technology with low cost to reduce exhaust gas temperature simultaneously.
The above-mentioned technical problem of the utility model mainly is able to solve through following technical proposals: a kind of fully burning blast-furnace gas boiler; Comprise burner hearth and flue thereof; It is characterized in that be provided with water-cooling wall around the said burner hearth, the top of said burner hearth is provided with steam; Burner hearth furnace arch, furnace nose top is provided with pendant superheater; Be provided with high temperature convection superheater and low temperature convection superheater in the horizontal flue of said pendant superheater back, said flue vertical shaft top is provided with steam, is provided with higher level's economizer, subordinate's economizer and air preheater in the flue tail vertical well successively; Be provided with feed-water heater after the said air preheater, be provided with the convection current evaporimeter between said low temperature convection superheater and the higher level's economizer.
The utility model adopts radiation and convection current combines, repeatedly intersect the typical superheater system of mixing, two-stage watering temperature adjustment.Compare with existing fully burning blast-furnace gas boiler technology; After low temperature superheater, before higher level's economizer, set up the convection current evaporimeter, under the situation that does not increase the boiler furnace size, it is not enough to remedy the boiler furnace caloric receptivity; Reduce higher level's economizer caloric receptivity, reduce higher level's economizer boiling degree; After air preheater, adopt feed-water heater to replace common separate heat pipe gas preheating device, reduce exhaust gas temperature.
The technical scheme of the utility model can also be further perfect:
As preferably, said water-cooling wall comprises front water wall and rear water wall, and it adopts light pipe to add band steel and is welded into film water cold wall structure, and every face wall is divided into a plurality of tube panels along width; Said rear water wall at the furnace outlet place to projecting inward formation furnace arch, furnace nose; To improve the upper furnace aerodynamic field; Folding forms the inclination angle in the said forward and backward wall water-cooling wall bottom, forms the burner hearth furnace bottom.
As preferably, before comprising, said pendant superheater shields superheater and back screen superheater; Said high temperature convection superheater is divided into cold section and hot arc, and cold section is arranged in both sides, in the middle of hot arc is arranged in.
As preferably, be provided with superheat temperature control between said high temperature convection superheater and low temperature convection superheater and preceding screen superheater and the back screen superheater; Superheat steam temperature is regulated and is adopted feedwater spray desuperheating mode, and secondary is arranged; Between preceding screen superheater and back screen superheater, arrange first order injection point, be coarse adjustment; Also can shield to back screen superheater; Between one-level high temperature convection superheater and low temperature convection superheater cold section and hot arc, arrange second level injection point, be fine tuning.
As preferably, all superheaters all are suspended on the steelframe of top through suspension rod.
As preferably, said convection current evaporimeter is made up of tube bank.
As preferably, said higher level's economizer and subordinate's economizer adopt spiral finned tube, and stagger arrangement is arranged in the flue tail vertical well, and twin-stage is arranged.Working medium and flue gas are adverse current.
As preferably, said air preheater adopts the vertical tube box structure, and the single-stage one-stroke arranges, for preventing the vibrations of air preheater, shock baffle is housed in bobbin carriage; The air preheat organ pipe is the thin-walled carbon spiral grooved tube.
Compared with prior art, employing the utlity model has following advantage:
1, owing to after low temperature superheater, before higher level's economizer, set up the convection current evaporimeter; Thereby can be under the situation that does not increase the boiler furnace size; It is not enough to remedy the boiler furnace caloric receptivity, helps reducing boiler floor space and steel consumption, reduces the boiler cost;
2, set up the convection current evaporimeter after, higher level's economizer caloric receptivity reduces, higher level's economizer boiling degree can be controlled at below 15% reliably, the flow resistance of working medium reduces in the economizer, thereby makes the power consumption of water pump reduce, and has reduced operating cost;
3, after higher level's economizer boiling degree reduced, the pressure of working medium reduced in the economizer, has guaranteed the safe operation of economizer, has got rid of the danger of booster;
4, feed-water heater is set behind air preheater; Can exhaust gas temperature be reduced to about 130 ℃ from about 200 ℃; Greatly reduce the exhaust gas temperature of boiler, improved boiler efficiency, and with separate heat pipe gas preheating device be set behind air preheater compare; Feedwater heater system is simple, with low cost, has reduced the cost of boiler.
Description of drawings
Fig. 1 is a kind of structural representation of the device of the utility model.
Description of reference numerals: 1, water-cooling wall, 2, drum, 3, steam; 4, pendant superheater, 5, the high temperature convection superheater, 6, the low temperature convection superheater; 7, convection current evaporimeter, 8, steam, 9, higher level's economizer; 10, subordinate's economizer, 11, air preheater, 12, feed-water heater.
The specific embodiment
Below through embodiment, and combine accompanying drawing, the technical scheme of the utility model is further specified.
The utility model provides a kind of fully burning blast-furnace gas boiler; Shown in accompanying drawing, the heating surface of fully burning blast-furnace gas boiler comprises furnace wall cooling 1, steam 3, pendant superheater 4, high temperature convection superheater 5, low temperature convection superheater 6, convection current evaporimeter 7, steam 8, higher level's economizer 9, subordinate's economizer 10, air preheater 11, feed-water heater 12.
Blast furnace gas sprays into the boiler furnace burning through burner; Produce high-temperature flue gas; In burner hearth with behind water-cooling wall 1, steam 3 radiation heat transfers, flow out burner hearth; Carry out radiation and convection current composite heat-exchange with pendant superheater 4; Carry out heat convection with high temperature convection superheater 5, low temperature convection superheater 6, convection current evaporimeter 7, steam 8, higher level's economizer 9, subordinate's economizer 10, air preheater 11, feed-water heater 12 in succession afterwards, the flue gas that is cooled to about 130 ℃ is sent into chimney by air-introduced machine, enters atmosphere at last.The heat of flue gas is absorbed by working medium in each heating surface.Working medium is heated after absorbing flue gas heat, evaporation and overheated.
Whole water-cooling wall 1 adopts light pipe to add band steel and is welded into fin panel casing.Every face wall is divided into a plurality of tube panels along width.Working medium is introduced drum by tube connector from the water-cooling wall upper collecting chamber through every face wall tedge.Common downcomer is drawn by large diameter pipe from the drum minimum point.Link to each other with water-cooling wall next part case through the dispersion down-comer in its underpart.Rear water wall at the furnace outlet place to projecting inward formation furnace arch, furnace nose, to improve the upper furnace aerodynamic field.Folding forms the inclination angle in the front-back wall water-cooling wall bottom, forms the burner hearth furnace bottom.
Adopt radiation and convection current combines, repeatedly intersect the typical superheater system of mixing, two-stage watering temperature adjustment.
Pendant superheater 4 is arranged in burner hearth furnace arch, furnace nose top, screen superheater and back screen superheater before comprising; The high temperature convection superheater is arranged in the horizontal flue.Roof tube, enclosure wall tube adopt light pipe to add the membrane wall structure of band steel.High temperature convection superheater 5 is divided into cold section and hot arc again, and cold section is arranged in both sides, in the middle of hot arc is arranged in.Vapor (steam) temperature is regulated and is adopted feedwater spray desuperheating mode, on the desuperheating water pipeline, is equiped with flow-through orifice, control valve, stop valve etc.Attemperator divides secondary to arrange, before first order injection point is arranged between screen superheater and the back screen superheater, but both coarse adjustment also can shield superheater and shield the back, second level injection point is arranged between cold section of primary superheater and the hot arc, is fine tuning.Direct-contact desuperheater is made up of flute shape jet pipe, mixing sleeve and shell.All parts of superheater all are suspended on the steelframe of top through suspension rod.Convection current evaporimeter 7 is made up of tube bank, is arranged at after the low temperature superheater 6, before higher level's economizer 9.Economizer is arranged in the tail vertical well, and twin-stage arranges that working medium and flue gas are adverse current.Economizer adopts spiral finned tube, and arrangement is stagger arrangement.Air preheater 11 adopts the vertical tube box structure, and the single-stage one-stroke is arranged.The air preheat organ pipe is the thin-walled carbon spiral grooved tube, and flue gas is parallel baffled in pipe, and air is transversal flow outside pipe.For preventing the vibrations of air preheater 11, shock baffle is housed in bobbin carriage.

Claims (8)

1. a fully burning blast-furnace gas boiler comprises burner hearth and flue thereof, it is characterized in that; Be provided with water-cooling wall around the said burner hearth; The top of said burner hearth is provided with steam, and burner hearth furnace arch, furnace nose top is provided with pendant superheater, is provided with high temperature convection superheater and low temperature convection superheater in the horizontal flue of said pendant superheater back; Said flue vertical shaft top is provided with steam; Be provided with higher level's economizer, subordinate's economizer and air preheater in the flue tail vertical well successively, be provided with feed-water heater after the said air preheater, be provided with the convection current evaporimeter between said low temperature convection superheater and the higher level's economizer.
2. a kind of fully burning blast-furnace gas boiler according to claim 1 is characterized in that said water-cooling wall comprises front water wall and rear water wall, and it adopts light pipe to add band steel and is welded into film water cold wall structure, and every face wall is divided into a plurality of tube panels along width; Said rear water wall at the furnace outlet place to projecting inward formation furnace arch, furnace nose; Folding forms the inclination angle in the said forward and backward wall water-cooling wall bottom, forms the burner hearth furnace bottom.
3. a kind of fully burning blast-furnace gas boiler according to claim 1 and 2 is characterized in that, screen superheater and back screen superheater before said pendant superheater comprises; Said high temperature convection superheater is divided into cold section and hot arc, and cold section is arranged in both sides, in the middle of hot arc is arranged in.
4. a kind of fully burning blast-furnace gas boiler according to claim 1 and 2 is characterized in that, is provided with superheat temperature control between said high temperature convection superheater and low temperature convection superheater and preceding screen superheater and the back screen superheater; Superheat steam temperature is regulated and is adopted feedwater spray desuperheating mode, and secondary is arranged; Between preceding screen superheater and back screen superheater, arrange first order injection point, be coarse adjustment; Between high temperature convection superheater and low temperature convection superheater cold section and hot arc, arrange second level injection point, be fine tuning.
5. a kind of fully burning blast-furnace gas boiler according to claim 1 and 2 is characterized in that all superheaters all are suspended on the steelframe of top through suspension rod.
6. a kind of fully burning blast-furnace gas boiler according to claim 1 and 2 is characterized in that said convection current evaporimeter is made up of tube bank.
7. a kind of fully burning blast-furnace gas boiler according to claim 1 and 2 is characterized in that, said higher level's economizer and subordinate's economizer adopt spiral finned tube, and stagger arrangement is arranged in the flue tail vertical well, and twin-stage is arranged.
8. a kind of fully burning blast-furnace gas boiler according to claim 1 and 2 is characterized in that, said air preheater employing vertical tube box structure, the single-stage one-stroke is arranged, shock baffle is housed in bobbin carriage; The air preheat organ pipe is the thin-walled carbon spiral grooved tube.
CN 201220183407 2012-04-27 2012-04-27 All-burned blast furnace gas boiler Expired - Lifetime CN202581258U (en)

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Application Number Priority Date Filing Date Title
CN 201220183407 CN202581258U (en) 2012-04-27 2012-04-27 All-burned blast furnace gas boiler

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Application Number Priority Date Filing Date Title
CN 201220183407 CN202581258U (en) 2012-04-27 2012-04-27 All-burned blast furnace gas boiler

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102661600A (en) * 2012-04-27 2012-09-12 杭州锅炉集团股份有限公司 Clean-burning blast furnace gas boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102661600A (en) * 2012-04-27 2012-09-12 杭州锅炉集团股份有限公司 Clean-burning blast furnace gas boiler

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CP01 Change in the name or title of a patent holder

Address after: 310004 No. 245 Dong Xin Road, Xiacheng District, Zhejiang, Hangzhou

Patentee after: Xizi clean energy equipment manufacturing Co.,Ltd.

Address before: 310004 No. 245 Dong Xin Road, Xiacheng District, Zhejiang, Hangzhou

Patentee before: HANGZHOU BOILER GROUP Co.,Ltd.

CP01 Change in the name or title of a patent holder
CX01 Expiry of patent term

Granted publication date: 20121205

CX01 Expiry of patent term