CN100462663C - A high-temperature low-oxygen air burning boiler and method employed thereof - Google Patents

A high-temperature low-oxygen air burning boiler and method employed thereof Download PDF

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Publication number
CN100462663C
CN100462663C CNB2006100325598A CN200610032559A CN100462663C CN 100462663 C CN100462663 C CN 100462663C CN B2006100325598 A CNB2006100325598 A CN B2006100325598A CN 200610032559 A CN200610032559 A CN 200610032559A CN 100462663 C CN100462663 C CN 100462663C
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China
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thermal capacitance
thermal
thin
temperature
air
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CNB2006100325598A
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Chinese (zh)
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CN1963370A (en
Inventor
艾元方
蒋绍坚
蒋受宝
张毅
孙英文
张灿
陈玉琴
马庆飞
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中南大学
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    • Y02E60/142

Abstract

An industrial boiler using thin wall thermal energy container and refers to high frequency switch to realize high temperature and lean oxygen burning. It mainly comprises paired reverse running and compact thin wall thermal energy container which is piled by thermal containers, with the wall thickness between the honeycomb channels of the thermal flake 0.4-1mm, inner side length of the channel 2.5-3.0mm. When the air quickly absorbs the reserved heat in the thermal container, the smoke heat quickly reserve in another thermal container, with 2.5-10s valve switching period, air and smoke exchanging channels to ensure the temperature efficiency of the boiler higher than 95%. 2.5-10s after valve switching, the high temperature and low oxygen smoke left in the hearth will dilute the oxygen ratio in the air below 15%, with NOx release less than 100 ppm high temperature and low oxygen burning in the hearth. It can use low value heat fuel and it is applicable for domestic or recovery boiler for both domestic and industry use.

Description

A kind of high-temperature low-oxygen air fired boiler and using method

Technical field the present invention relates to the reverse-flow compact thin wall thermal capacitance of a kind of employing device storage release heat and flue gas air duct high frequency switching principle realizes there is not flame in stove, even, the energy-efficient and low NO of temperature xThe Industrial Boiler of discharging burning.Be applicable to that the recovery boiler in thermal power plant, power plant for self-supply and paper mill and various civilian, industry and boiler for domestic use.

The background technology Industrial Boiler is one of Thermal Equipment commonly used of industry heating.In the traditional industry boiler plant, the increasing of oxygen concentration in the combustion air, flue gas waste heat recovery and combustion air temperature improve, and help burning and heat energy utilization.From the current combustion The Application of Technology, increase oxygen content merely and reduced fuel consumption, but brought some new problems simultaneously, little as the flame volume, flame local temperature height, temperature distributing disproportionation etc. in the combustion chamber.With regard to conventional air preheating and flue gas waste heat recovery The Application of Technology, by economizer and air preheater are set, other various overheavy firing heat transfer technologies of integrated application have been obtained the high thermal efficiency, but these plant area areas are big, bulky, increased once investment and maintenance cost.In addition, conventional boiler also has the shortcoming of following aspect: the most wall-type heat exchange technology that adopt of flue gas waste heat recovery, be subjected to restrictions such as heat exchange efficiency, material heat resistanceheat resistant resistance to corrosion and system's leakage loss, the air preheating temperature of wall-type heat exchange system is difficult to above 600 ℃, average ignition temperature is not high in the burner hearth, can not lower heat of combustion fuel; Need the designed combustion device to stablize stove internal combustion flame; Because the flame volume is little, unit flame volume burning heating strength is big, and the flame temperature height is heating power type NO xAdvantage has been created in discharging; The ignition temperature height, the heating surface oxidization burning loss is big.

Summary of the invention is huge for the heat convection equipment volume that overcomes conventional boiler, little, the NO of burner hearth internal combustion flame volume xGenerate many and can not use shortcoming such as low calorie fuels, the invention provides the reverse-flow thin-walled thermal capacitance of a kind of employing compact device storage release heat and come reduction means size significantly, switch approach realizes the burning of high temperature preheating low oxygen concentration in burner hearth boiler plant by flue gas air duct high frequency.

The high-temperature low-oxygen air fired boiler, mainly comprise the heat insulation-type furnace wall, thermal capacitance chamber and flue gas air duct switch valve, built-in water-cooling pipe in the furnace wall, the thermal capacitance chamber is provided with in pairs, the thermal capacitance chamber connects with air exhaust gases passes switch valve by tube connector, at the indoor thin-walled thermal capacitance device that is equipped with of thermal capacitance; thin-walled thermal capacitance device is by stacked the forming of thin-walled thermal capacitance sheet with honeycomb hole passage, and the thermal capacitance sheet forms by firing based on the earth of alumina composition, is full of the heat insulation-type binding agent between the thermal capacitance sheet; the mutual UNICOM of honeycomb hole passage of thermal capacitance sheet; thermal capacitance sheet interchannel wall thickness 0.4~1mm, the length of side is 2.5~3.0mm in the passage, and specific area surpasses 800m 2/ m 3

The using method of high-temperature low-oxygen air fired boiler by the air exhaust gases passes switch valve of tube connector and two thermal capacitance chamber UNICOMs, is switched once between 2.5~10s, makes air and flue gas exchange flow channel.2.5 the switching cycle of~10s has guaranteed that the temperature efficiency of two thin-walled thermal capacitances of boiler device cooperation is higher than 95%.In addition, 2.5~10s after the switch valve action is in the time, the high-temperature low-oxygen concentration flue gas that is stranded in thermal capacitance chamber, tube connector and burner hearth has little time to discharge out of the furnace, oxygen concentration has guaranteed to take place in the stove high-temperature low-oxygen air burning that flame is full of whole burner hearth to the degree that is lower than 15% in the diluent air effectively.

Thermal power plant, industrial recovery boiler and all kinds of civilian, industry and boiler for domestic can use the present invention.

Invent two thin-walled thermal capacitance devices and replaced the convection section equipment of conventional boiler, and do not had the burner and the retention flame facility of conventional boiler.Two thin-walled thermal capacitance devices reclaim preheated air in the time of kiln gas high temperature sensible heat, have guaranteed the economy of invention.Reactant time of staying in flame is long, and incomplete combustion loss reduces.Fuel vaporization, cracking and spontaneous combustion process quicken, and efficiency of combustion improves.Invention using combustible low-calorific-value gaseous fuel (as producer gas, blast furnace gas and imperial smelting furnace flue gas etc.).The CO discharging is lower than 100ppm, NO xDischarging is lower than 100ppm, and temperature efficiency surpasses 95%, and fractional energy savings is up to 30%

Description of drawings

Fig. 1 is a structural representation of the present invention.

The specific embodiment:

The present invention is further illustrated below in conjunction with accompanying drawing.

As shown in Figure 1, invention comprises heat insulation-type furnace wall 1, thermal capacitance chamber 2 and 8, thin-walled thermal capacitance device 3 and 7, metal hose 4 and 6, air exhaust gases passes switch valve 5.Furnace wall 1 is embedded with water cooling tube.The thermal capacitance chamber is generally being provided with.Thin-walled thermal capacitance device 3 and 7 places respectively in thermal capacitance chamber 2 and the thermal capacitance chamber 8, thermal capacitance device 3 and 7 and a side and the furnace wall face of thermal capacitance chamber 2 and 8 tangent, thermal capacitance chamber 2 and 8 all leave 1 gas compartment away from the furnace wall side.Furnace wall 1 connects in the flange mode mutually with thermal capacitance chamber 2 and thermal capacitance chamber 8.Thermal capacitance chamber 2 connects in the flange mode by metal hose 4 and air exhaust gases passes switch valve 5, and thermal capacitance chamber 8 connects in the flange mode by metal hose 6 and air exhaust gases passes switch valve 5.Metal hose 4 and 6 can reduce the destruction of burner hearth 1 elevated temperature heat stress to whole device.The weight of thin-walled thermal capacitance device 3 by thermal capacitance chamber 2 together with the weight transmitting of thermal capacitance chamber 2 to the furnace wall 1, the weight of thin-walled thermal capacitance device 7 also is passed to furnace wall 1 by thermal capacitance chamber 8 together with the weight of thermal capacitance chamber 8.Thermal capacitance chamber 2, thin-walled thermal capacitance device 3 and metal hose 4 and thermal capacitance chamber 8, thin-walled thermal capacitance device 7 and metal hose 6 to be connected arrangement identical, two covers connect can be along the furnace wall 1 centralized arrangement, also can be along the furnace wall 1 dispersed placement.

Thin-walled thermal capacitance device 3 and 7 is by stacked the forming of numerous thin-walled thermal capacitance sheets.The thermal capacitance sheet forms by firing based on the earth of alumina composition, has the honeycomb hole gas channel, between the passage between wall thickness 0.4~1mm, the length of side 2.5~3.0mm in the passage, specific area surpasses 800m 2/ m 3When the thermal capacitance sheet is stacked, between the thermal capacitance sheet heat insulation-type binding agent, numerous mutual UNICOMs of thermal capacitance sheet honeycomb hole passage, the drag losses when reducing air flow stream to greatest extent and crossing honeycomb channel.When air or flue gas flow through thin-walled thermal capacitance sheet honeycomb channel, gas and vias inner walls in the face of stream and radiation heat transfer thermal resistance much larger than the inner thermal conduction resistance of thermal capacitance sheet (it is far away little of 1 to finish your criterion numeral of room), so that each thermal capacitance sheet changes in time and changes with the temperature of uniformity all the time.

When air flow through thin-walled thermal capacitance device 3, flue gas flow through thin-walled thermal capacitance device 7.High-temperature flue gas is discharged via thermal capacitance chamber 8 under the exhaust opening suction function of air exhaust gases passes switch valve 5.In the thermal capacitance chamber 8 li, high-temperature flue gas is stored in 7 li of thin-walled thermal capacitance devices rapidly with its sensible heat that carries, and temperature reduces (exceeding about 100 ℃ of environment temperatures) significantly and finally is discharged into atmosphere when treating that flue gas flows out thin-walled thermal capacitance device 7.Normal temperature air enters burner hearth 1 via thermal capacitance chamber 2 under the air inlet positive pressure of air exhaust gases passes switch valve 5.In the thermal capacitance chamber 2 li, air takes out rapidly and is stored in the heat of 3 li of thin-walled thermal capacitance devices and is warmed up to above combustion gas self-ignition point temperature levels.Along with the prolongation of heat-exchange time, thin-walled thermal capacitance device 7 is lost the ability that reclaims obvious heat of smoke gradually because of having stored increasing heat, and thin-walled thermal capacitance device 3 is lost the ability of preheated air gradually because of having emitted increasing heat.2.5 behind~the 10s, 5 actions of air exhaust gases passes switch valve, air and flue gas exchange glide path, air flows through thin-walled thermal capacitance device 3 with reflux type, and flue gas flows through thin-walled thermal capacitance device 7 with reflux type.At this moment, air enters in the stove through switch valve 5, metal hose 6 and thin-walled thermal capacitance device 7; Flue gas enters atmosphere through thin-walled thermal capacitance device 3, metal hose 4 and switch valve 5.

2.5 the action of~10s transfer valve, the ability of thin-walled thermal capacitance device 7 store heat and thin-walled thermal capacitance device 3 release heat all do not have obviously to descend, and have kept two thin-walled thermal capacitance device cooperation temperature efficiencies to be higher than 95%.In addition, a large amount of low flue gases of temperature height, oxygen concentration has been detained in the stop supplies combustion gas during transfer valve action in thermal capacitance chamber, metal hose and the burner hearth.When following one-period begins, these be detained flue gas dilutions the air oxygen concentration sent into through thin-walled thermal capacitance device honeycomb hole passage to the level that is lower than 15%.2.5~10s is whole times of discharging of high-temperature low-oxygen concentration flue gas of being detained in the stove just, the combustion gas molecule that sprays in the stove can touch the low combustion-supporting mixed airflow of temperature height and oxygen concentration all the time, therefore guaranteed to take place in the stove in whole running times the high-temperature low-oxygen air burning well, the stove internal combustion is stable, heat release is even, and flame is full of whole burner hearth.

Claims (2)

1. high-temperature low-oxygen air fired boiler, it is characterized in that: mainly comprise the heat insulation-type furnace wall, thermal capacitance chamber and flue gas air duct switch valve, built-in water-cooling pipe in the furnace wall, the thermal capacitance chamber is provided with in pairs, the thermal capacitance chamber connects with flue gas air duct switch valve by tube connector, at the indoor thin-walled thermal capacitance device that is equipped with of thermal capacitance; thin-walled thermal capacitance device is by stacked the forming of thermal capacitance sheet with honeycomb hole passage, and the thermal capacitance sheet forms by firing based on the earth of alumina composition, is full of the heat insulation-type binding agent between the thermal capacitance sheet; the mutual UNICOM of honeycomb hole passage of thermal capacitance sheet; honeycomb hole interchannel wall thickness 0.4~1mm, the length of side is 2.5~3.0mm in the honeycomb hole passage, and honeycomb hole passage specific area surpasses 800m 2/ m 3
2. the using method of high-temperature low-oxygen air fired boiler according to claim 1, it is characterized in that: by the flue gas air duct switch valve of tube connector and two thermal capacitance chamber UNICOMs, between 2.5~10s, switch once, make air and flue gas exchange flow channel.
CNB2006100325598A 2006-11-10 2006-11-10 A high-temperature low-oxygen air burning boiler and method employed thereof CN100462663C (en)

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CN100462663C true CN100462663C (en) 2009-02-18

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Publication number Priority date Publication date Assignee Title
CN101430093B (en) * 2007-11-05 2010-06-23 中南大学 Low-calorie fuel fast combustion gasification apparatus

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