CN1086788C - High temperature high pressure electric power station boiler fully burning blast-furnace gas - Google Patents

High temperature high pressure electric power station boiler fully burning blast-furnace gas Download PDF

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Publication number
CN1086788C
CN1086788C CN 97103909 CN97103909A CN1086788C CN 1086788 C CN1086788 C CN 1086788C CN 97103909 CN97103909 CN 97103909 CN 97103909 A CN97103909 A CN 97103909A CN 1086788 C CN1086788 C CN 1086788C
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CN
China
Prior art keywords
furnace gas
blast furnace
gas
boiler
blast
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CN 97103909
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Chinese (zh)
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CN1163370A (en
Inventor
杨天助
沈月芬
卞松
赵长白
张继文
关钟盛
钱凯
沈一平
曹子栋
滑铁钢
仲德贵
贾志国
黄毅兴
王守秩
高晓斌
喻寿康
王德臣
李伟君
吴新生
任立兵
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首钢总公司
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Priority to CN 97103909 priority Critical patent/CN1086788C/en
Publication of CN1163370A publication Critical patent/CN1163370A/en
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Publication of CN1086788C publication Critical patent/CN1086788C/en

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Abstract

The present invention relates to a high-temperature high-voltage power station boiler of fully burning blast-furnace gas. The boiler chamber of the present invention is divided into a burning chamber and an upper furnace chamber by a girdling, the bottom of the boiler chamber is a sealed flat boiler bottom with a certain angle, the water-cooled wall of the burning chamber is sprayed with fire-resistant materials to form a fire-resistant zone, and a flue at the tail part is provided with a smoke side heat exchanger with a high-boiling coal economizer and a blast-furnace gas preheater. The boiler chamber of the present invention is divided into two sections through the girdling to form the secondary mixing of gas, the unique structure of the burning chamber ensures the stable and complete burning of the blast-furnace gas, and a burner adopts the strong vortex mixing of the blast-furnace gas and burning-assistant air so that the present invention can stably operate under a low load. The present invention has the advantages of reasonable design, high heat efficiency and obvious economic benefit and avoids the waste of energy source, and environmental pollution.

Description

The high temperature high pressure electric power station boiler of fully burning blast-furnace gas

The invention belongs to the station boiler field, be specifically related to a kind of high temperature high pressure electric power station boiler of fully burning blast-furnace gas.

Blast furnace gas is the attached production capacity source in a kind of iron and steel enterprise production process, accounts for 18~24% of enterprise's gross energy.Because its calorific value is lower, is 3260-3762KJ/Nm only, acting as a fuel to be directly used in has bigger difficulty in the industry.At present, this part energy is burnt but still have most of blast furnace gas to diffuse to air mainly as the fuel of hot-blast stove, coke oven, causes great energy waste and environmental pollution.

In China, blast furnace gas mainly is that the form with auxiliary fuel is used in the high-pressure boiler, is main fuel with the coal dust as the 500MW unit of Shoudu Iron and Steel Co private station, and the design newspaper burning rate of blast furnace gas is 20%, and actual can only connecing burns 7%.

The purpose of this invention is to provide a kind of is high temperature high pressure electric power station boiler fuel, burning and stable fully burning blast-furnace gas with the blast furnace gas.

The high temperature high pressure electric power station boiler of this fully burning blast-furnace gas, adopt single drum, Natural Circulation, common downcomer, inverted U is arranged, it is characterized in that burner hearth is separated into combustion chamber 3 and upper furnace 7 two parts by with a tight waist 5, at the bottom of the open hearth of bottom 1 for band certain angle and sealing of burner hearth, burner 2 is arranged on the front-back wall of combustion chamber 3, in the shell of burner, outwards be followed successively by central tube 21 from the lining, blast furnace gas passage 22, combustion-supporting air channel 23, high-energy firing gun 25 and coke-stove gas ignitron 26 are arranged in the central tube 21, flame monitor 24 is arranged in the blast furnace gas passage 22, in blast furnace gas passage 22, be furnished with blast furnace gas swirl vane 27, in combustion-supporting air channel 23, be furnished with combustion air swirl vane 28; Sprayable refractory forms wall with refractory lining, refracto 6 on the water-cooling wall of combustion chamber 3, water-cooling wall links to each other with gas bag 8, pendant superheater 10 is lifted on the top of upper furnace, high temperature superheater 11, low temperature superheater 12 is arranged in the horizontal flue successively, steam 9 is arranged in the top of boiler furnace, steam 13 is arranged in the reversal chamber 14, in vertical well gas flue, be furnished with higher level's economizer 15 successively, subordinate's economizer 16, air preheater 17, back-end ductwork is furnished with the blast furnace gas preheater, by fume side heat exchanger 19, coal gas side heat exchanger 20 is formed, and fume side heat exchanger 19 constitutes circulation with coal device side heat exchanger 20 by intermediate medium and carries out the heat transmission.

Subordinate's economizer 16 one tunnel links to each other with drum, and one the tunnel links to each other with higher level's economizer 15, and the boiling degree of higher level's economizer 15 is 5~30%.

The eddy flow direction of blast furnace gas swirl vane 27 and combustion air swirl vane 28 is identical in the burner, and the swirl strength of blast furnace gas and combustion air is respectively between 0.2~20.

The present invention has the following advantages:

1. because by-product---the blast furnace gas of this station boiler clean burn blast furnace ironmaking production in crossing saved a large amount of fire coals, avoid diffusing of blast furnace gas, caused the waste and the environmental pollution of the energy;

2. because the calorific value of blast furnace gas is lower, this boiler is divided into two section with burner hearth by the with a tight waist of centre for burning blast-furnace gas, make lower furnace constitute a relatively independent combustion chamber, add the setting of wall with refractory lining, refracto, reduce the heat absorption of combustion chamber, make lower furnace form the high-temperature region of a part, thereby guaranteed catching fire and smooth combustion of blast furnace gas, the secondary that has formed gas simultaneously when air flow stream is crossed waisting mixes, thus guaranteed the completing combustion of blast furnace gas and temperature evenly;

3. furnace bottom is kept away the formula structure for envelope, and cold wind can not enter burner hearth from the bottom, makes flameholding;

4. the employing of high boiling degree economizer has remedied the deficiency that recepts the caloric because of evaporation in the boiler stoves that reason caused such as blast furnace gas calorific value is low;

5. the gas preheating device has adopted separate type heat pipe exchanger, has avoided coal gas directly to contact with flue gas, and safety, reliable because the raising of blast furnace gas charging temperature has been created condition for the smooth combustion of blast furnace gas on the one hand, has improved fire box temperature on the other hand;

6. the used burner of this boiler is owing to adopt blast furnace gas and the strong eddy flow of combustion air mixes, for the present invention is creating condition than the stable operation under the underload:

7. this boiler design is reasonable, thermal efficiency height, and remarkable in economical benefits as the boiler of a 220t/h, per hour can be utilized 200,000 Nm 3Blast furnace gas, the Spring Festival holidays are economized about 150,000 tons of standard coal, direct economic benefit can reach more than 7,000 ten thousand yuan.

Embodiments of the invention are respectively schemed referring to following:

Fig. 1 is the cutaway view of the high temperature high pressure electric power station boiler of fully burning blast-furnace gas

Fig. 2 is the half sectional view of high-power bispin stream blast furnace gas burner

The present invention be a kind of be high parameter station boiler such as Fig. 1 of unique fuel with blast furnace gas, adopt single drum, Natural Circulation, common downcomer, inverted U to arrange.Blast furnace gas sprays into combustion chamber 3 burnings from burner 2, after high-temperature flue gas is disposed in pendant superheater 10 heat absorptions on water-cooling wall around the burner hearth and upper furnace 7 tops, flow through high temperature superheater 11, the low temperature superheater 12 of horizontal flue in succession, flue gas is by they and steam 9 with after being arranged in steam 13 heat absorptions of reversal chamber, in tail vertical well, further lowered the temperature by upper and lower level economizer 15,16, air preheater 17, weary gas is sent to smoke stack emission by air-introduced machine at last by the fume side heat exchanger 19 preheating blast furnace gases of gas preheating device.

Boiler furnace is a kind of semi-open furnace, by waisting 5 burner hearth is divided into combustion chamber 3 and upper furnace 7.Spray refractory material on the water-cooling wall of combustion chamber 3 and formed wall with refractory lining, refracto 6, burner hearth bottom has adopted at the bottom of the open hearth of band certain angle 1 and sealing, because waisting 5 makes the combustion chamber relatively independent, add the setting of wall with refractory lining, refracto 6, thereby guaranteed catching fire and smooth combustion of blast furnace gas, the secondary that has formed gas simultaneously when air flow stream is crossed waisting 15 mixes, thereby has guaranteed the completing combustion of blast furnace gas.

Economizer is the economizer of a kind of minute two-stage, higher level's economizer 15 is high boiling degree economizer, subordinate's economizer 16 produces undersaturated stove water, and a part is introduced drum 8 as rinse water, and all the other are sent to the steam water interface that higher level's economizer 15 produces the certain boiling degree of band.The employing of high boiling degree economizer has remedied the deficiency that recepts the caloric because of evaporation in the boiler stoves that reason caused such as blast furnace gas calorific value is low.

The gas preheating device is a kind of separate type heat pipe exchanger, and it is made up of fume side heat exchanger 19 and coal gas side heat exchanger 20 two parts, and is middle by communicating pipe carrying out the conveying of vapour or water.Because flue gas and coal gas are independent at a distance, it improves greatly than the safety coefficient of conventional gas change heater.After the present invention adopts the separate heat pipe gas change heater,, improved fire box temperature on the other hand because the raising of blast furnace gas charging temperature has been created condition for the smooth combustion of blast furnace gas on the one hand.

The present invention has arranged 15 high-power bispins stream blast furnace gas burners 2 at the front-back wall of upper furnace 7, and front wall divides three layers to arrange 9, and back wall divides has two-layerly arranged 6.

Blast furnace gas burner as shown in Figure 2, it is the high-power bispin stream blast furnace gas burner that a kind of boiler is used, and is made up of central tube 21, blast furnace gas passage 22, combustion air passage 23, flame monitoring rifle 24, blast furnace burning torch 25, coke-stove gas ignitron 26.Be provided with swirl vane 27,28 in blast furnace gas passage 22 and combustion air passage 23, blast furnace gas swirl vane 27 is identical with combustion air swirl vane 28 eddy flow directions.Combustion air enters volute by air inlet 29, and the air outlet of volute enters burner hearth through combustion-supporting air channel 23, combustion air swirl vane 28, and blast furnace gas enters burner hearth by air inlet 30, blast furnace gas passage 22, swirl vane 27.The blast furnace gas flow is controlled by control valve, and the combustion air flow is controlled by motor-operated control valve.This burner is owing to adopting the strong eddy flow of blast furnace gas and combustion air to mix, at 4000-16000Nm 3Can both guarantee in the burning capacity scope of/h that blast furnace gas has fully with combustion air mixes, for the present invention is creating condition than the stable operation under the underload.

Igniter fuel of the present invention is a coke-stove gas, and its ignition order is: light the coke-stove gas of each layer earlier, the blast furnace gas of the front wall lower floor of then igniting, the blast furnace gas of the back wall lower floor of igniting then, the blast furnace gas of other layer that ignite at last.Coke-stove gas cut off after blast furnace gas ignited.

The present invention per hour recycles blast furnace gas 200,000 Nm 3, therefore the blast furnace gas of Shoudu Iron and Steel Co diffuses rate to be reduced greatly, and generated energy improves greatly, and annual about 150,000 tons of the mark coal of saving estimates that the year economic benefit that steel band comes headed by the present invention reaches 7,000 ten thousand yuan.

The present invention is being equipped with conventional carbon monoxide in-line analyzer 8 and boiler safety protection system 4 on the female pipe of blast furnace gas and on the sidewall of back-end ductwork.

Successful implementation of the present invention,, minimizing environmental pollution energy-saving and cost-reducing to Chinese iron and steel enterprise, the technological progress that promotes industry has produced huge directive significance.

Claims (3)

1. the high temperature high pressure electric power station boiler of a fully burning blast-furnace gas, adopt single drum, Natural Circulation, common downcomer, inverted U is arranged, it is characterized in that burner hearth is separated into combustion chamber (3) and upper furnace (7) two parts by (5) with a tight waist, at the bottom of the open hearth of the bottom of burner hearth (1) for band certain angle and sealing, burner (2) is arranged on the front-back wall of combustion chamber (3), in the shell of burner, outwards be followed successively by central tube (21) from the lining, blast furnace gas passage (22), combustion-supporting air channel (23), high-energy firing gun (25) and coke-stove gas ignitron (26) are arranged in the central tube (21), flame monitor (24) is arranged in the blast furnace gas passage (22), in blast furnace gas passage (22), be furnished with blast furnace gas swirl vane (27), in combustion-supporting air channel (23), be furnished with combustion air swirl vane (28); Sprayable refractory forms wall with refractory lining, refracto (6) on the water-cooling wall of combustion chamber (3), water-cooling wall links to each other with gas bag (8), pendant superheater (10) is lifted on the top of upper furnace, high temperature superheater (11), low temperature superheater (12) is arranged in the horizontal flue successively, steam (9) is arranged in the top of boiler furnace, steam (13) is arranged in the reversal chamber (14), in vertical well gas flue, be furnished with higher level's economizer (15) successively, subordinate's economizer (16), air preheater (17), back-end ductwork is furnished with the blast furnace gas preheater, by fume side heat exchanger (19), coal gas side heat exchanger (20) is formed, and fume side heat exchanger (19) constitutes circulation with coal device side heat exchanger (20) by intermediate medium and carries out the heat transmission.
2, boiler according to claim 1 is characterized in that subordinate's economizer (16) a tunnel links to each other with drum, and one the tunnel links to each other with higher level's economizer (15), and the boiling degree of higher level's economizer (15) is 5~30%.
3, boiler according to claim 1 is characterized in that blast furnace gas swirl vane (27) is identical with the eddy flow direction of combustion air swirl vane (28) in the described burner, and the swirl strength of blast furnace gas and combustion air is respectively between 0.2~20.
CN 97103909 1997-04-15 1997-04-15 High temperature high pressure electric power station boiler fully burning blast-furnace gas CN1086788C (en)

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CN1086788C true CN1086788C (en) 2002-06-26

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009094817A1 (en) * 2008-01-25 2009-08-06 Shanghai Boiler Works Co., Ltd A burner only for burning blast furnace gas or low calorific gas
CN102128443A (en) * 2011-03-08 2011-07-20 中国华能集团清洁能源技术研究院有限公司 Pulverized coal boiler suitable for ultrahigh steam temperature
CN102242922A (en) * 2010-04-23 2011-11-16 美特索电力公司 Boiler equipped with a superheater
CN102439365A (en) * 2009-05-22 2012-05-02 美特索电力公司 A preheater for combustion air, and a power plant

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CN102269421A (en) * 2011-07-08 2011-12-07 西安热工研究院有限公司 Method and device for increasing hot air temperature of power station boiler
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
CN103133067A (en) * 2013-03-15 2013-06-05 南京凯盛开能环保能源有限公司 Steel-mill residual blast-furnace gas and residual saturated steam comprehensive utilization power generation system
CN103206699B (en) * 2013-04-10 2015-04-01 无锡华光锅炉股份有限公司 Pulverized coal boiler capable of subcritically combusting lean coal
CN103353121B (en) * 2013-07-24 2016-12-28 江苏海事职业技术学院 A kind of Blast Furnace Gas-fired Boiler fume afterheat advanced recycling system
CN103700309B (en) * 2013-12-21 2016-06-08 哈尔滨锅炉厂有限责任公司 Thermal-state experiment device for combustion organization optimization
CN104279759B (en) * 2014-08-13 2017-10-24 广东万家乐燃气具有限公司 A kind of gas heater and automatic cleaning method for carrying clearing function
CN104238534B (en) * 2014-10-20 2017-02-01 江苏海事职业技术学院 Online monitoring device and online monitoring method for boiling degree of blast-furnace gas boiler economizer
CN105423271B (en) * 2015-11-08 2019-03-08 广东工业大学 Energy-saving steam-supplying boiler system
CN109539821A (en) * 2018-10-19 2019-03-29 天津大学 A kind of heat energy recycle method and device of high-temperature metallurgical slag
CN110260300A (en) * 2019-05-29 2019-09-20 华中科技大学 Increase the boiler furnace structure and supercritical carbon dioxide coal-burning boiler of thermal resistance outside interior augmentation of heat transfer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009094817A1 (en) * 2008-01-25 2009-08-06 Shanghai Boiler Works Co., Ltd A burner only for burning blast furnace gas or low calorific gas
CN102439365A (en) * 2009-05-22 2012-05-02 美特索电力公司 A preheater for combustion air, and a power plant
CN102242922A (en) * 2010-04-23 2011-11-16 美特索电力公司 Boiler equipped with a superheater
CN102128443A (en) * 2011-03-08 2011-07-20 中国华能集团清洁能源技术研究院有限公司 Pulverized coal boiler suitable for ultrahigh steam temperature
CN102128443B (en) * 2011-03-08 2012-12-12 中国华能集团清洁能源技术研究院有限公司 Pulverized coal boiler suitable for ultrahigh steam temperature

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Effective date of registration: 20090313

Address after: Beijing Shougang General Corporation power plant postcode: 100041

Co-patentee after: Beijing Shougang Huaxia Engineering Technology Co., Ltd.

Patentee after: Shougang

Address before: Beijing Shougang General Corporation power plant postcode: 100041

Patentee before: Capital Iron & Steel General Company

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