CN201053749Y - Biomass fuel boiler - Google Patents

Biomass fuel boiler Download PDF

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Publication number
CN201053749Y
CN201053749Y CNU2007200794660U CN200720079466U CN201053749Y CN 201053749 Y CN201053749 Y CN 201053749Y CN U2007200794660 U CNU2007200794660 U CN U2007200794660U CN 200720079466 U CN200720079466 U CN 200720079466U CN 201053749 Y CN201053749 Y CN 201053749Y
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CN
China
Prior art keywords
flue
biomass fuel
burner hearth
air
fuel boiler
Prior art date
Application number
CNU2007200794660U
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Chinese (zh)
Inventor
万思本
蔡文钢
陈金火
Original Assignee
华西能源工业股份有限公司
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Application filed by 华西能源工业股份有限公司 filed Critical 华西能源工业股份有限公司
Priority to CNU2007200794660U priority Critical patent/CN201053749Y/en
Application granted granted Critical
Publication of CN201053749Y publication Critical patent/CN201053749Y/en

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Abstract

The utility model discloses a biomass-burning boiler, on the base of the prior coal-burning boiler, a primary wind box, a secondary wind port respectively arranged inside a feed pipe and inside a hearth which positioned under the feed pipe, a plurality of secondary wind ports arranged in a staggered way at the right side and the left side of the hearth; each wind port is provided with a damper regulator; suspension firing is main mode and grate firing is auxiliary mode, which achieve the sufficient combustion of the biomass fuel; as an improvement of the utility model, the cross section of the combustion zone of the hearth is larger than that of the burnout zone; the inlet of the first flue is provided with a crust block bundle with a cooling water way; according to various biomass fuels, the boiler is provided with overheaters at different positions; a chimney flue at the end part is connected with a dust separator and an exhauster in turn; and adjoining furnace heating devices are arranged inside the water wall lower header of the hearth, the first flue and a second flue. The utility model has the advantages of preventing hot corrosion, guaranteeing the heat-exchange efficiency and the safety of the bunker, shortening starting time and prolonging the life-span.

Description

Biomass fuel boiler
Technical field
It is the boiler of fuel with living beings such as stalks that the utility model relates to a kind of.
Background technology
According to statistics by the end of the year in 2004, the whole world is that the biomass fuel generator installation total amount of representative has reached 3,900 ten thousand kilowatts with the stalk, alternative 7,000 ten thousand tons of standard coals, it is wind-powered electricity generation, photoelectricity, the summation of renewable energy power generation amounts such as underground heat, and traditional coal-burning boiler, comprise drum, burner hearth, feed pipe, first flue, second flue, tail vertical well gas flue, an air compartment, the secondary blast device, the water-cooled vibrating-grate stoker, superheater, economizer, air preheater, pressure fan etc., can't be applied to biomass fuel, this is because biomass fuel proportion is little, volume is big, grate firing can not be realized abundant burning on fire grate, and in the burner hearth is malleation, the fuel that enters burner hearth might be blown into the feed bin of feed pipe top through feed pipe, causes fire; Secondly, part biological matter fuel has higher tar content, the flue gas that produces is than thickness, both easily went up coking at high temperature pipe (superheater etc.), the corrosion pipe also reduces heat exchange efficiency simultaneously, the flue gas of thickness is easily knotted at narrower flue place again, influences the proper flow of flue gas, reduces the heat exchange efficiency of boiler; Moreover the calorific value of biomass fuel is lower, moisture big, the difficulty of catching fire, and the start-up time of boiler is longer; People were at the characteristics of biomass fuel afterwards, boiler has been done certain improvement, as the patent No. be: ZL03150475 and application number are: two kinds of biomass fuel boilers of 200610029424, feeding hinge dragon is installed in the former feed pipe and in burner hearth, increases arch and the segmentation wind nozzle that links to each other with main air duct, this to biomass fuel catch fire and after-flame certain help is arranged, but its combustion system is a grate firing still, does not reach best combustion; The latter has increased the secondary air channel that links to each other with pressure fan below material inlet, its combustion system is grate firing and suspension combustion to a certain degree, but still based on grate firing, and secondary wind is the cold wind of normal temperature, temperature fluctuation is bigger in the stove, can not realize sufficient burning, the most important thing is the two all the flue gas of unresolved thickness to burn into and the influence of heat exchanging efficient and the safety problem of feed bin of pipe.
The utility model content
The purpose of this utility model is the above-mentioned deficiency at prior art, provides a kind of fully burning, protection pipe can realized not to be corroded, to guarantee short biomass fuel boiler of heat exchange efficiency and feed bin safety, start-up time.
For achieving the above object, biomass fuel boiler of the present utility model, comprise drum, burner hearth, feed pipe, first flue, second flue, tail vertical well gas flue, air compartment, secondary blast device, water-cooled vibrating-grate stoker, economizer, air preheater, pressure fan etc., wherein be equipped with water-cooling wall and collection case, it is characterized in that an air compartment is connected with the hot-flow flue of air preheater by airduct at burner hearth, first flue and second flue; The secondary blast device comprises the overfiren air port in the burner hearth that is separately positioned in the feed pipe, below the feed pipe and is arranged on the burner hearth left and right sides and staggered several overfiren air ports, all overfiren air ports all are connected with the hot-flow flue of air preheater, and are equipped with controllable register in each air outlet of an air compartment and all overfiren air ports;
The cold wind that comes from pressure fan four the tunnel is sent into burner hearth being divided into after the air preheater heating: the first via enters burner hearth bottom by each air outlet of an air compartment; The second the tunnel, enter burner hearth by the overfiren air port in the feed pipe with fuel; Third Road enters burner hearth by the overfiren air port in the burner hearth of feed pipe below; The four the tunnel, enter burner hearth by being arranged on burner hearth left and right sides and staggered several overfiren air ports; During boiler operatiopn, if biomass fuel moisture content is less, to go into the stove granularity shorter, impurities is less, and then most fuel are subjected to the acting in conjunction of four transportation work styles to be suspended in aerial burning; Otherwise, then regulate the proportioning of primary and secondary air again by controllable register, make part of fuel be suspended in aerial burning, part of fuel drops on the fire grate burns, based on suspension combustion, grate firing is auxilliary, realizes the abundant burning of biomass fuel, and the primary and secondary air of high temperature makes the temperature fluctuation in the burner hearth less, also helps realizing abundant burning;
As further improvement of the utility model, the furnace wall of described burner hearth face arch and rear arch below is distinguished forward, the rear expansion, the combustion zone cross section of face arch and rear arch below is greater than the burning-out zone cross section of its top, can strengthen the volume of combustion zone, avoid the temperature of combustion zone too high, coking appears in the pipe (water-cooling wall, fire grate etc.) that prevents the combustion zone, avoids burn into to guarantee heat exchange efficiency;
As further improvement of the utility model, in being furnished with, inlet the place ahead of first flue establishes the Crust blocks pipe bundle of cooling water channel, cooling water is arranged in the Crust blocks pipe bundle, its surface temperature is lower, can prevent coking, the dope in the flue gas is condensed thereon, purify flue gas, guarantee the proper flow of flue gas in the flue of back, guarantee heat exchange efficiency;
As further improvement of the utility model, in the burner hearth in Crust blocks pipe bundle the place ahead, also be provided with back screen superheater, this kind setting is suitable for the lower grey stalk biomass fuel of tar content, although temperature is higher, also is difficult for coking herein;
As further improvement of the utility model, in first flue, also be provided with pipe and flue pendant superheater in the same way, this kind setting is suitable for the higher yellow stalk biolobic material fuel of tar content, makes flue gas and pendant superheater be parallel baffled, prevents coking;
As further improvement of the utility model, the perpendicular and flue of afterbody also links to each other with deduster, air-introduced machine successively, and boiler burner hearth in running is in negative pressure state all the time, and the fuel that prevents to enter burner hearth is blown into the feed bin of feed pipe top, assurance safety;
As further improvement of the utility model, in the water-cooling wall next part case of burner hearth, first flue and second flue, also be provided with adjacent stove heater respectively, this neighbour's stove heater comprises the pipe that is provided with steam inlet, several steam distribution holes and gripper shoe; As long as there is other steam boiler that is moving at the scene, just can borrow steam to the next part case by steam inlet temporarily, shorten the boiler startup time;
As further improvement of the utility model, on the both walls of lower furnace portion combustion zone, also be provided with oil burner; Further shorten the boiler startup time;
As further improvement of the utility model, the internal duct two ends of water-cooled vibrating-grate stoker link to each other with economizer with drum respectively, are provided with recirculating line between the inlet header case of drum and economizer, and recirculating line is provided with stop valve; When boiler startup, this recirculating line should be opened, make between drum and water-cooled grate, economizer and form natural convection loop, prevent economizer and water-cooled vibrating-grate stoker overtemperature, steam, when shortening the boiler startup time, can protect economizer, fire grate not to be damaged again; When normal operation, close this pipeline;
In sum, the utility model can realize that the abundant burning of biomass fuel, protection pipe are not corroded, guarantee heat exchange efficiency and feed bin safety, shorten start-up time, long service life.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment one.
Fig. 2 is the structural representation of the utility model embodiment two.
Fig. 3 is the structured flowchart of the air and gas system of two embodiment.
Fig. 4 is two embodiment right-side wall partial sectional views.
Fig. 5 is that the A of Fig. 1 is to partial view.
Fig. 6 is the structural representation of adjacent stove heater in the two embodiment next part casees.
The partial structurtes block diagram of the boiler circuit of Fig. 7 two embodiment.
The specific embodiment
Embodiment one
This biomass fuel boiler is suitable for the higher yellow stalk biolobic material of tar content, by shown in Figure 1, comprise drum 1, burner hearth 2, feed pipe 3, first flue 4, second flue 5, tail vertical well gas flue 6, air compartment 7, secondary blast device, water-cooled vibrating-grate stoker 8, economizer 9, air preheater 10, pressure fan (not shown) etc., wherein be equipped with water-cooling wall and collection case at burner hearth 2, first flue 4 and second flue 5; By shown in Figure 3, one time air compartment is connected with the hot-flow flue of air preheater by airduct; The secondary blast device comprises the overfiren air port in the burner hearth that is separately positioned in the feed pipe, below the feed pipe and several overfiren air ports of two rows that are arranged on the burner hearth left and right sides, (as shown in Figure 1 and Figure 4, overfiren air port 20 is staggered), all overfiren air ports all are connected with the hot-flow flue of air preheater, and in each air outlet of an air compartment and all overfiren air ports, being equipped with controllable register, tail vertical well gas flue also links to each other with deduster, air-introduced machine successively; By shown in Figure 1, the furnace wall of the face arch of burner hearth 2 and rear arch below is distinguished forward, the rear expansion, the cross section of face arch and combustion zone 11, rear arch below is greater than the cross section of its top burning-out zone 12, in being furnished with, inlet the place ahead of first flue 4 establishes the Crust blocks pipe bundle 13 of cooling water channel, in the Crust blocks pipe bundle 13 cooling water is arranged, in first flue 4, also be provided with pendant superheater 14, (as shown in Figure 5, the pipe of pendant superheater 14 and flue are in the same way); Also be provided with adjacent stove heater respectively in the water-cooling wall next part case 15 of burner hearth 2, first flue 4 and second flue 5, this neighbour's stove heater comprises the pipe (as shown in Figure 6) that is provided with steam inlet 16, several steam distribution holes 17 and gripper shoe 18; On the both walls of furnace combustion zone 11, also be provided with oil burner 19; By shown in Figure 7, the internal duct two ends of water-cooled vibrating-grate stoker (outlet collection case and inlet header case) links to each other with economizer with drum respectively, is provided with recirculating line between the inlet header case of drum and economizer, and recirculating line is provided with stop valve;
When boiler startup, as long as there is other steam boiler that is moving at the scene, just can borrow steam to next part case 15 by the steam inlet 16 of adjacent stove heater temporarily, restart oil burner 19, shorten the boiler startup time; Simultaneously recirculating line is opened, made between drum and water-cooled grate, economizer and form natural convection loop, prevent economizer and water-cooled vibrating-grate stoker overtemperature, steam, protection economizer, fire grate are not damaged; When normal operation, close this pipeline; The cold wind that comes from pressure fan four the tunnel is sent into burner hearth being divided into after the air preheater heating: the first via enters burner hearth bottom by each air outlet of an air compartment; The second the tunnel, enter burner hearth by the overfiren air port in the feed pipe with fuel; Third Road enters burner hearth by the overfiren air port in the burner hearth of feed pipe below; The four the tunnel, enter burner hearth by being arranged on burner hearth left and right sides and staggered several overfiren air ports; During boiler operatiopn, if biomass fuel moisture content is less, to go into the stove granularity shorter, impurities is less, and then most fuel are subjected to the acting in conjunction of four transportation work styles to be suspended in aerial burning; Otherwise, then regulate the proportioning of primary and secondary air again by controllable register, make part of fuel be suspended in aerial burning, part of fuel drops on the fire grate burns, based on suspension combustion, grate firing is auxilliary, realizes the abundant burning of biomass fuel, and the primary and secondary air of high temperature makes the temperature fluctuation in the burner hearth less, also helps realizing abundant burning; Make burner hearth be in negative pressure state all the time by air-introduced machine, the fuel that prevents to enter burner hearth is blown into the feed bin of feed pipe top, guarantees safety; Because the cross section of combustion zone 11 greater than the cross section of burning-out zone 12, can strengthen the volume of combustion zone 11, avoids the temperature of combustion zone 11 too high, prevents that coking from appearring in the pipe of combustion zone 11, avoid burn into to guarantee heat exchange efficiency; The surface temperature of Crust blocks pipe bundle 13 is lower, can prevent coking, and the dope in the flue gas is condensed thereon, purifies flue gas, guarantees the proper flow of flue gas in the flue of back, guarantees heat exchange efficiency; Flue gas and pendant superheater 14 are parallel baffled, prevent coking;
Embodiment two
This biomass fuel boiler is suitable for the lower grey stalk biomass of tar content, by shown in Figure 2, the difference of it and embodiment one only is that the back screen superheater 21 with Crust blocks pipe bundle 13 the place aheads has replaced among the figure 4 pendant superheater 14 in first flue, because the tar content of grey stalk is lower, even at high temperature also be difficult for coking, pipe can not be corroded, thereby guarantees heat exchange efficiency.

Claims (9)

1. biomass fuel boiler, comprise drum, burner hearth, feed pipe, first flue, second flue, tail vertical well gas flue, air compartment, secondary blast device, water-cooled vibrating-grate stoker, economizer, air preheater, pressure fan etc., wherein be equipped with water-cooling wall and collection case, it is characterized in that an air compartment is connected with the hot-flow flue of air preheater by airduct at burner hearth, first flue and second flue; The secondary blast device comprises the overfiren air port in the burner hearth that is separately positioned in the feed pipe, below the feed pipe and is arranged on the burner hearth left and right sides and staggered several overfiren air ports, all overfiren air ports all are connected with the hot-flow flue of air preheater, and are equipped with controllable register in each air outlet of an air compartment and all overfiren air ports.
2. biomass fuel boiler according to claim 1 is characterized in that the burning-out zone cross section of the combustion zone cross section of described burner hearth face arch and rear arch below greater than its top.
3. biomass fuel boiler according to claim 1 and 2 is characterized in that establishing the Crust blocks pipe bundle of cooling water channel in inlet the place ahead of first flue also is furnished with.
4. biomass fuel boiler according to claim 3 is characterized in that also being provided with back screen superheater in the burner hearth in Crust blocks pipe bundle the place ahead.
5. biomass fuel boiler according to claim 3 is characterized in that also being provided with pipe and flue pendant superheater in the same way in first flue.
6. according to claim 4 or 5 described biomass fuel boilers, it is characterized in that tail vertical well gas flue also links to each other with deduster, air-introduced machine successively.
7. biomass fuel boiler according to claim 6, it is characterized in that also being provided with adjacent stove heater respectively in the water-cooling wall next part case of burner hearth, first flue and second flue, this neighbour's stove heater comprises the pipe that is provided with steam inlet, several steam distribution holes and gripper shoe.
8. biomass fuel boiler according to claim 7 is characterized in that also being provided with oil burner on the both walls of lower furnace portion combustion zone.
9. biomass fuel boiler according to claim 8, the internal duct two ends that it is characterized in that the water-cooled vibrating-grate stoker link to each other with economizer with drum respectively, also be provided with recirculating line between the inlet header case of drum and economizer, recirculating line is provided with stop valve.
CNU2007200794660U 2007-04-30 2007-04-30 Biomass fuel boiler CN201053749Y (en)

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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100498058C (en) * 2007-04-30 2009-06-10 华西能源工业股份有限公司 Biomass fuel boiler
CN102384464A (en) * 2010-09-06 2012-03-21 上海锅炉厂有限公司 Built-in heating device of boiler header
CN106123009A (en) * 2016-07-08 2016-11-16 吴鹏 A kind of boiler drum wind apparatus
CN106123008A (en) * 2016-07-08 2016-11-16 吴鹏 A kind of safe and efficient boiler drum wind apparatus
CN107155730A (en) * 2017-06-02 2017-09-15 清华大学 Intelligent greenhouse system
CN109210558A (en) * 2018-09-07 2019-01-15 曾金玉 A kind of biomass boiler high-temperature flue gas purification processing unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100498058C (en) * 2007-04-30 2009-06-10 华西能源工业股份有限公司 Biomass fuel boiler
CN102384464A (en) * 2010-09-06 2012-03-21 上海锅炉厂有限公司 Built-in heating device of boiler header
CN102384464B (en) * 2010-09-06 2013-11-27 上海锅炉厂有限公司 Built-in heating device of boiler header
CN106123009A (en) * 2016-07-08 2016-11-16 吴鹏 A kind of boiler drum wind apparatus
CN106123008A (en) * 2016-07-08 2016-11-16 吴鹏 A kind of safe and efficient boiler drum wind apparatus
CN107155730A (en) * 2017-06-02 2017-09-15 清华大学 Intelligent greenhouse system
CN109210558A (en) * 2018-09-07 2019-01-15 曾金玉 A kind of biomass boiler high-temperature flue gas purification processing unit

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C25 Abandonment of patent right or utility model to avoid double patenting
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Effective date of abandoning: 20070430