CN102840592A - Low-temperature smoke recirculation system - Google Patents
Low-temperature smoke recirculation system Download PDFInfo
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- CN102840592A CN102840592A CN2012103334132A CN201210333413A CN102840592A CN 102840592 A CN102840592 A CN 102840592A CN 2012103334132 A CN2012103334132 A CN 2012103334132A CN 201210333413 A CN201210333413 A CN 201210333413A CN 102840592 A CN102840592 A CN 102840592A
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Abstract
A low-temperature smoke recirculation system is mounted on a pulverized coal boiler, wherein cold smoke access points are arranged in the positions at the bottom and at the back of a separation screen of the pulverized coal boiler; the cold smoke access points are communicated with a recirculation fan through an outlet flue of a circulation fan; the recirculation fan is communicated with a cold smoke extraction point of a deduster through an inlet flue of the recirculation fan; and a control damper is arranged on the inlet flue of the recirculation fan. The low-temperature smoke recirculation system transmits the cold smoke to the bottom or the back of the separation screen of the pulverized coal boiler and rapidly cools high-temperature smoke in the field, so as to reduce the contamination activity of higher-sodium coal, and enables the higher-sodium coal to be attached to fly ash particles, thereby avoiding or mitigating the problems of contamination, wear, corrosion and the like of a tail convection heating surface, and alleviating the difficulties that the higher-sodium coal at the east Junggar basin region is difficult to transport outwards, the transport cost is high, and the higher-sodium coal is difficult to utilize in situ to generate electricity.
Description
Technical field
The invention belongs to high sodium coal clean and effective and utilize technical field, particularly be used to use a kind of low-temperature flue gas recirculating system of the pulverized-coal fired boiler of high sodium coal.
Background technology
3,900 hundred million tons of the accurate eastern coal field prediction reserves in Xinjiang, 2,136 hundred million tons of actual proved reserves at present.
The coal mineral is the general name of all inorganic substances except that moisture; Be main mainly with Si, Al; Elements such as Fe, Ca, Mg, Na, K are that the compound of assisting is formed, and it is the essential element that causes slagging scorification, dust stratification that these inorganic mineral elements utilize in the process in the thermal transition of coal.Accurate eastern coal sodium content high (2-12%) is to cause accurate eastern coal to use the main cause that is prone to contamination, slagging scorification in the process at coal-powder boiler, is that accurate eastern coal is opened up the bottleneck of utilization on a large scale.
Sodium is general main to be existed with clay mineral, silicate, zeolite, rock salt form, is present in the coal with the organic form sometimes.(be commonly considered as more than 900 ℃) under the high-temp combustion environment; Alkali metal and relevant inorganic elements form slag or get into gas phase in burner hearth, the form with steam and fly ash granule is deposited on the heating surface then, and heat exchange efficiency reduces; Stop up exhaust gases passes, even cause the heating surface heavy corrosion.If the flue gas chilling is when being lower than 500 ℃, the vapour of an alkali metal major part is attached on the fly ash granule, and contamination property significantly reduces, and is aided with the measure that increases the low temperature heating surface tube pitch again, makes coal-powder boiler use high sodium coal reliability and availability significantly improves.
Therefore, if high sodium coal is as the steam coal trans-utilization that burns, the key technology that research and development are relevant is current primary selection.
The domestic technique aspect; Domesticly aspect steam coal, attempt at high sodium coal; Built coal-powder boiler and the CFBB that uses high sodium coal in area, accurate east and Mi Dong area, Xinjiang, but existence in service some be difficult to effect a radical cure the problem of solution, be summarized as follows:
1) water-cooling wall slagging scorification.Soot blower frequently blows ash in the stove; Wash away water-cooling wall and cause water-cooling wall attenuate booster, a large amount of bigger clinker moment comes off, and falls into the furnace bottom water seal arrangement; Cause the interior water of water seal arrangement to be impacted, vaporize by red-hot cinder, a large amount of steam causes burner hearth combustion fluctuation and fire extinguishing.
2) high temperature superheater, high low temperature reheater tube seriously corroded.And cause leakage, a large amount of replace tubes of having to.
3) high temperature superheater, high low-temperature reheater heating surface stain dust stratification, serious wear.Even high temperature superheater pipe pitch S1 and S2 are respectively 200mm and 89mm, sub-pitch S1 of high low temperature reheater tube and S2 are respectively 100mm and 80.8mm, still have part heating surface intertubular space to be blocked fully.Simultaneously, because the stifled in a large number ash of convection heating surface forms the flue gas corridor, sweep of gases causes high temperature reheater, high low temperature superheater wear and leakage.
4) dust stratification is serious, main, reheat steam temperature does not reach design rating because of convection heating surface stains.
The high sodium coal of the serious restriction of the problems referred to above is as the application of steam coal, develops a kind ofly practicablely to be applicable to that the key technology that uses high sodium coal coal-powder boiler is extremely urgent.
The foreign technology aspect, the high sodium coal reserves of the U.S. is also very abundant, mainly concentrates on northern US.Pennsylvania state university, B&W company and Southern company etc. as far back as last century the nineties just begun the research and the engineering demonstration work of high sodium coal clean utilization aspect, walk far away before China.Pennsylvania state university mainly be devoted to sodium in the coal compose deposit, the research and the experiment of generation and transformation mechanism aspect; B&W company furthers investigate using high sodium coal burning boiler design aspect; And developed the 700MW coal-powder boiler that uses high sodium coal; Engineering is illustrated in northern De Keta state power plant; Its major technique measure is to increase back-end ductwork size and convection heating surface tube pitch, and takes special sootblower, alleviates the situation of convection heating surface contamination, slagging scorification; Southern company development and Design the transport gasification furnace, also accumulating some design experiences aspect the high sodium coal gasification, the transport gasification furnace that is built in Dongguan, China Guangdong by its design does not put into operation as yet.
Except that the research aspect the high sodium coal industrial utilization device; Also in other preliminary treatment,,, physics or chemical reaction remove the sodium in the coal abroad in the hope of taking place at normal temperatures as adopting water and having the fermentation such as liquid (oxalic acid etc.) washing of high-affinity to study to sodium; These technology all rest on the laboratory research stage; Commercial Application not as yet, because technology is immature, prior reason is that production cost is too high on the one hand.
Summary of the invention
In order to overcome the defective of above-mentioned prior art; The object of the present invention is to provide a kind of low-temperature flue gas recirculating system, the cold flue gas that is introduced into is with the regional chilling of high-temperature flue gas behind the screen end or screen, and then it is active to reduce high sodium coal contamination; And it is attached in the fly ash granule; Thereby avoid or alleviate the problems such as contamination, wearing and tearing and corrosion of afterbody convection heating surface appearance, the regional high sodium coal transmission in the accurate east of alleviation is difficult, freight charges are high, are difficult to utilize on the spot the predicament of generating again.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of low-temperature flue gas recirculating system; Be installed on the pulverized-coal fired boiler; It is characterized in that be provided with cold flue gas access point 5 with position, screen back divide the screen of shield 4 at pulverized-coal fired boiler at the bottom of, cold flue gas access point 5 is connected with recirculation blower 7 through circulating fan exhaust pass 6; Recirculation blower 7 is connected with the cold flue gas leading point 10 of deduster 11 through recirculation blower inlet flue duct 9, and recirculation blower inlet flue duct 9 is provided with damper 8.
The position that flue gas recirculation of the present invention system gets into boiler furnace is divided into the screen end, screen back or back-end surfaces place; And can be according to screen back flue-gas temperature; Adjustment flue gas recycled amount; Flue gas and flying dust are chilled to the active state of low contamination, and then avoid or alleviate the situation generation of the contamination of afterbody convection heating surface, obstruction even corrosion heating surface, solve the difficult problem that high sodium coal directly uses.It is about about 25% that flue gas recirculation increases the flue gas total amount, under the condition of equal back-end ductwork area and convection heating surface tube pitch, improved velocity of flue gas, the raising of heating surface oneself deashing ability.Because the method that at present domestic and international high sodium coal burning boiler design is generally adopted is the method that increases back-end ductwork area and tube pitch merely, intention reduces the probability that flying dust stains heating surface.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are done and to be described in detail.
With reference to accompanying drawing; A kind of low-temperature flue gas recirculating system is installed on the pulverized-coal fired boiler, and pulverized-coal fired boiler comprises the U type burner hearth 2 that is made up of fin panel casing 3; One side end of burner hearth 2 is furnace hoppers 1; One side U type corner of burner hearth 2 is provided with branch shield 4, and the opposite side of burner hearth 2 is disposed with superheater 13, reheater 14, economizer 15 and air preheater inlet flue duct 16 from top to bottom, and the top of superheater 13 is provided with cigarette temperature measuring point 12; Be provided with cold flue gas access point 5 with position, screen back divide the screen of shield 4 at pulverized-coal fired boiler at the bottom of; Cold flue gas access point 5 is connected with recirculation blower 7 through circulating fan exhaust pass 6, and recirculation blower 7 is connected with the cold flue gas leading point 10 of deduster 11 through recirculation blower inlet flue duct 9, and recirculation blower inlet flue duct 9 is provided with damper 8.
Operation principle of the present invention is:
The present invention is delivered to low-temperature flue gas (being about 130-150 ℃) at the bottom of the screen of boiler or behind the screen through cold flue gas access point 5; This zone with high-temperature flue gas (900-1100 ℃) quench cooled to 800-500 ℃ about, when screen when flue-gas temperature reaches 900 ℃ at the end, start recirculation blower 7; After the system that treats is stable; According to the flue-gas temperature at the screen end, screen back or back-end surfaces place, adjust damper 8 again, cold flue gas is introduced in after recirculation blower 7 superchargings and is located at the burner hearth screen end, screen back or back-end surfaces place; The cold flue gas temperature is generally 130-150 ℃; In the horizontal flue zone, rapidly hot flue gas (temperature is 900-1100 ℃) is cooled to about 800-500 ℃, this moment, high sodium coal ash and flue gas stain active significantly reduction, and most of sodium element is present in the flying dust with solid-state form; Thereby eliminate or alleviate the contamination of afterbody convection heating surface, dust stratification, phenomenon of blocking, reach the purpose of high sodium coal pulverized-coal fired boiler operation steady in a long-term.
Claims (1)
1. low-temperature flue gas recirculating system; Be installed on the pulverized-coal fired boiler; Pulverized-coal fired boiler comprises the burner hearth (2) of the U type that is made up of fin panel casing (3); One side end of burner hearth (2) is furnace hopper (1), and a side U type corner of burner hearth (2) is provided with branch shield (4), and the opposite side of burner hearth (2) is disposed with superheater (13), reheater (14), economizer (15) and air preheater inlet flue duct (16) from top to bottom; The top of superheater (13) is provided with cigarette temperature measuring point (12); It is characterized in that be provided with cold flue gas access point (5) with position, screen back divide the screen of shield (4) at pulverized-coal fired boiler at the bottom of, cold flue gas access point (5) is connected with recirculation blower (7) through circulating fan exhaust pass (6); Recirculation blower (7) is connected with the cold flue gas leading point (10) of deduster (11) through recirculation blower inlet flue duct (9), and recirculation blower inlet flue duct (9) is provided with damper (8).
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| CN2012103334132A CN102840592A (en) | 2012-09-10 | 2012-09-10 | Low-temperature smoke recirculation system |
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| CN2012103334132A CN102840592A (en) | 2012-09-10 | 2012-09-10 | Low-temperature smoke recirculation system |
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| CN102840592A true CN102840592A (en) | 2012-12-26 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148476A (en) * | 2013-03-11 | 2013-06-12 | 西安交通大学 | Flue gas recirculation boiler system burning fuel with high sodium and potassium contents |
| CN103206716A (en) * | 2013-02-01 | 2013-07-17 | 西安热工研究院有限公司 | Multi-coal-type adaptive type low-NOx burning system |
| CN103486563A (en) * | 2013-09-10 | 2014-01-01 | 章礼道 | Supercritical once-through boiler capable of firing eastern Junggar coal |
| CN105387448A (en) * | 2014-09-03 | 2016-03-09 | 上海汉鼎环保技术工程有限公司 | Boiler system for cold flue gas recirculation and cold flue gas recirculation method |
| CN106196124A (en) * | 2016-08-23 | 2016-12-07 | 苏州泰盛新绿节能环保科技有限公司 | A kind of coal-burning boiler assembly reducing smoke evacuation oxygen content |
| CN106287687A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of burner flue gas recirculation boiler structure |
| CN107906511A (en) * | 2017-12-07 | 2018-04-13 | 浙江大学 | A kind of middle low-temperature flue gas dual-cycle plant and its method for preventing high-alkali coal slagging |
| CN107917417A (en) * | 2017-12-12 | 2018-04-17 | 上海交通大学 | A kind of boiler smoke recirculation blower anti-corrosion system |
| CN109681860A (en) * | 2019-02-18 | 2019-04-26 | 新疆维吾尔自治区特种设备检验研究院 | A kind of system and method reducing the coking of high basic metal coal combustion |
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| CN101004268A (en) * | 2006-07-16 | 2007-07-25 | 中国石油化工集团公司 | Equipment and technique for treating waste liquid from production of acrylonitrile |
| CN102434868A (en) * | 2011-12-21 | 2012-05-02 | 哈尔滨锅炉厂有限责任公司 | 660MW-grade supercritical boiler |
| CN202813354U (en) * | 2012-09-10 | 2013-03-20 | 中国华能集团清洁能源技术研究院有限公司 | Device for utilizing smoke recirculation to reduce high-sodium coal contamination activity |
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2012
- 2012-09-10 CN CN2012103334132A patent/CN102840592A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101004268A (en) * | 2006-07-16 | 2007-07-25 | 中国石油化工集团公司 | Equipment and technique for treating waste liquid from production of acrylonitrile |
| CN102434868A (en) * | 2011-12-21 | 2012-05-02 | 哈尔滨锅炉厂有限责任公司 | 660MW-grade supercritical boiler |
| CN202813354U (en) * | 2012-09-10 | 2013-03-20 | 中国华能集团清洁能源技术研究院有限公司 | Device for utilizing smoke recirculation to reduce high-sodium coal contamination activity |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206716A (en) * | 2013-02-01 | 2013-07-17 | 西安热工研究院有限公司 | Multi-coal-type adaptive type low-NOx burning system |
| CN103148476A (en) * | 2013-03-11 | 2013-06-12 | 西安交通大学 | Flue gas recirculation boiler system burning fuel with high sodium and potassium contents |
| CN103148476B (en) * | 2013-03-11 | 2016-01-20 | 西安交通大学 | A kind of flue gas recirculation steam generator system using high sodium potassium content fuel |
| CN103486563A (en) * | 2013-09-10 | 2014-01-01 | 章礼道 | Supercritical once-through boiler capable of firing eastern Junggar coal |
| CN103486563B (en) * | 2013-09-10 | 2015-04-08 | 章礼道 | Supercritical once-through boiler capable of firing eastern Junggar coal |
| CN105387448A (en) * | 2014-09-03 | 2016-03-09 | 上海汉鼎环保技术工程有限公司 | Boiler system for cold flue gas recirculation and cold flue gas recirculation method |
| CN106287687A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of burner flue gas recirculation boiler structure |
| CN106196124A (en) * | 2016-08-23 | 2016-12-07 | 苏州泰盛新绿节能环保科技有限公司 | A kind of coal-burning boiler assembly reducing smoke evacuation oxygen content |
| CN107906511A (en) * | 2017-12-07 | 2018-04-13 | 浙江大学 | A kind of middle low-temperature flue gas dual-cycle plant and its method for preventing high-alkali coal slagging |
| CN107917417A (en) * | 2017-12-12 | 2018-04-17 | 上海交通大学 | A kind of boiler smoke recirculation blower anti-corrosion system |
| CN109681860A (en) * | 2019-02-18 | 2019-04-26 | 新疆维吾尔自治区特种设备检验研究院 | A kind of system and method reducing the coking of high basic metal coal combustion |
| CN109681860B (en) * | 2019-02-18 | 2024-01-05 | 新疆维吾尔自治区特种设备检验研究院 | System and method for reducing combustion coking of high alkali metal coal |
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Application publication date: 20121226 |