CN202484979U - Energy-saving environmental-friendly biomass fuel boiler - Google Patents

Abstract

An energy-saving environmental-friendly biomass fuel boiler belongs to the technical field of boilers, and comprises a box body, a pair of smoke-return boxes, an upper-row smoke box and a lower-row smoke box, a smoke-return tube and a smoke-discharge tube, wherein the box body is provided with a water cavity, a furnace, a chimney flue and a furnace ash outlet, the upper portion of each smoke-return box is provided with a smoke-return box ash cleaning opening in an extending mode and the lower portion of each smoke-return box is provided with a smoke-return box ash outlet in an extending mode, the upper-row smoke box is provided with upper-row smoke box cavities and the lower-row smoke box is provided with lower-row smoke box cavities, the smoke-return tube is placed on a lower portion of the water cavity, and the smoke-discharge tube is placed on an upper portion of the water cavity. The top of the box body is provided with a water-leading connector used for leading water to the water cavity, an evacuation connector which protrudes into the water cavity, a group of first air-inlet tubes which are communicated with the chimney flue and used for leading external air into the chimney flue, and a group of second air-inlet tubes which are communicated with the furnace and used for leading external air into the furnace. A lower portion of one side of the box body along the length direction is provided with a water outlet connector which is communicated with the water cavity. The energy-saving environmental-friendly biomass fuel boiler has the advantages of being fuel-saving and environmental-friendly.

Description

The energy-conserving and environment-protective biomass fuel boiler

Technical field

The utility model belongs to the boiler technology field, is specifically related to a kind of energy-conserving and environment-protective biomass fuel boiler

Background technology

above mentioned biomass fuel boiler is meant the boiler that acts as a fuel with biomass material, biomass material be not limited to like straw, rice chaff, wood sawdust, shell, bagasse, corncob, or the like.People are accustomed to claiming that this raw material is a bio-fuel, and then are called the renewable sources of energy.

are along with the non-renewable energy resources such as oil, coal, natural gas and ocean ice falls sharply; And price constantly rises; And, be regarded as the tasteless when eaten modest and boring of " chicken ribs " and aforementioned bio-fuel that hesitate to discard has obtained unprecedented attention along with the continuous enhancing of the mankind to environmental consciousness in the past.Add up according to China agricultural sector; The whole nation is year nearly 1,000,000,000 tons of the quantums of output of crops such as straw, wheat straw, jowar, corn, cotton and soybean stalk only; Acquisition coefficient calculations with 90% to 95%; Can obtain 9 to 9.5 hundred million tons, be equivalent to obtain 4.5 hundred million to 4.75 hundred million tons of standard coals (energy of 1 ton of stalk is equivalent to 0.5 ton of standard coal).So-called standard coal is the mark coal that people's custom is called, and according to CNS GB2589-81, the calorific value of every kilogram of mark coal is 29271 kilojoules, promptly 7000 kilocalories.

Bio-fuel from the above, is effectively utilized in , not only can reduce the dependence to non-renewable natural resources, and has desirable relatively cheap property.Yet; Because the bulk density of stalk is lower; Give and collect, transport and store and put into boiler applications and bring certain difficulty; Thereby usually need it is shaped to solid, use the density and the calorific value that improve bioenergy, through after the moulding and volume contract to 8-10 doubly about, density reaches 1.2-1.5 ton/m ³ After just can show the degree of medium coal.Bio-fuel is processed into after this physical aspect just provides guarantee for boiler uses, Here it is the people reason place of why favoring biomass boiler in recent years.The technology contents that bio-fuel is processed into solid can be seen in disclosed Chinese patent document in a large number; Slightly with give an example like CN201030648Y (biological substance fuel forming machine), CN201205759Y (forming machine for straw in biomass), CN201456417U (herbage stalk briquette make-up machine), CN201415498Y (rolling-type forming machine for straw) and CN201415499Y (stalk roller head machine) and CN102205664A (bio-fuel make-up machine), or the like.

aforesaid biomass fuel boiler also can be seen in disclosed Chinese patent document in a large number; Select with give an example like publication No. CN102313282A (the HTHP CFBB of biological substance for combustion stalk), CN202109645U (reciprocal grate living beings material half a heat of gasification homogeneous solution-type reactor), CN202109530U (a kind of biomass fuel hot pot stove), CN202092302U (a kind of horizontal chamber biomass fired boiler), CN202109644U (built-in multiple tracks cyclone dust removal biological particles boiler) and CN202109469U (horizontal biomass fuel boiler), or the like.

are typically with biomass fuel boiler such as document A); " a kind of many backhauls of backfire living beings low-carbon energy-saving hot-water boiler ", document B that CN202106947U recommends); " horizontal environmental protection and energy saving biomass boiler " and document C that CN202008229U provides), " living beings are hanged down the nitrogen direct-combustion boiler " that CN202109471U introduces.

are though above-mentioned document A can embody the technique effect of the 0005th section in specification; But objectively exist the situation of a large amount of fume emissions; Thereby lose environmental protection and energy-saving effect, and the cleaning difficulty is big in the pipe of vertical many backhauls fire tube.Above-mentioned document B is owing to is connected entery and delivery port with set of heat exchange tubes in being located at heat-exchanging chamber, water flowing in the tube chamber of set of heat exchange tubes is a high-temperature flue gas and manage outward; Therefore can only satisfy i.e. combustion promptly with requiring; And can not embody water storage, and if continuous water, water temperature is difficult to ensure so.Above-mentioned document C belongs to biomass fuel gasifying stove category, and is not the biomass fuel boiler for truly.Also can be about the biomass fuel gasifying stove by being seen in the disclosed documents such as CN101531925A that are not limited to.

are as biomass fuel boiler; Except bringing into play its advantage of utilizing regenerated resources, the control ash is an important factor, because the ash of coal is generally up to about 15-25%; Therefore environment had destructiveness; And if the ash of biomass fuel is controlled at about 2%, so not only can embody ultimate attainment energy-saving effect, and can embody close friend environment.Yet in disclosed patent and non-patent literature, all be not seen in the teachings that is able to satisfy above-mentioned requirements; The applicant has done repeatedly and good try for this reason; And under the secrecy provision of strictness, prove practicable through experiment, the technical scheme that will introduce below is based on producing under this prerequisite

Summary of the invention

The task of the utility model be to provide a kind of help to significantly improve the after-flame effect of biomass fuel is used and is both embodied the energy-conservation energy-conserving and environment-protective biomass fuel boiler that ensures harmless environment.

The task of the utility model is accomplished like this; A kind of energy-conserving and environment-protective biomass fuel boiler, comprise have water cavity, at a distance from the separated casing of burner hearth ash hole being located at the flue in the water cavity and being positioned at the below of burner hearth being located at burner hearth in the water cavity, communicating with burner hearth; What be arranged on said casing left end and both sides that correspond respectively to said burner hearth respectively constitutes a pair of smoke-returning box of smoke chamber once parallelly; Each smoke-returning box is positioned at described water cavity; And the top of each smoke-returning box be extended with one with return that smoke chamber communicates and be stretched over the smoke-returning box cleaning door that the outer casing cleaning door with on being opened in casing of water cavity matches, and the bottom be extended with one same with return that smoke chamber communicates and be stretched over the smoke-returning box ash hole that the casing ash hole with on being opened in casing outside the water cavity matches equally; Self be arranged on accordingly said casing right-hand member and be positioned at said water cavity have last smoking box chamber one on smoking box and smoking box once with down smoke-discharging case chamber; Wherein: last smoking box has one and is stretched over the outer last smoking box exhaust opening of casing; And the down smoke-discharging case has one and is stretched over the outer down smoke-discharging case cleaning door of casing, and described flue communicates with described down smoke-discharging case chamber; Return smoke pipe, be positioned at the bottom of said water cavity, the left end and the smoke-returning box that return smoke pipe connect, and communicate with said smoke-returning box chamber, and right-hand member and said down smoke-discharging case connect, and communicate with said down smoke-discharging case chamber; Pipe; Be positioned at the top of said water cavity; The left end and the smoke-returning box of pipe connect; And communicate with the smoke-returning box chamber, and right-hand member and the said smoking box of going up connect, and communicate with last smoking box chamber; Wherein: be provided with the diversion interface that is used for diversion in said water cavity at the top of said casing, be insinuated into vent in the water cavity, one group communicates with said flue is used for introducing second blast pipe to burner hearth introducing outside air that is used for that first blast pipe and a group of outside air communicates with burner hearth to flue, and be provided with the water outlet interface that communicates with said water cavity in the bottom of a side of casing length direction.

are in one of the utility model concrete embodiment; The quantity of described time smoke pipe has two groups; Every group has complex root; These two groups return in the smoke pipe wherein one group return the left end of smoke pipe and the bottom of one of them smoke-returning box in the described a pair of smoke-returning box connects; And an end of right-hand member and said down smoke-discharging case connects, and two groups are returned that in the smoke pipe another organized back the left end of smoke pipe and the bottom of another smoke-returning box in the described a pair of smoke-returning box connects, and the other end of right-hand member and said down smoke-discharging case connects.

are in another concrete embodiment of the utility model; The quantity of described smoke exhaust pipe has two groups; Every group has complex root; The left end of the wherein one group of pipe in these two groups of pipes and the top of one of them smoke-returning box in the described a pair of smoke-returning box connect; And a right-hand member and a said end of going up smoking box connect, and the left end of another group pipe in two groups of pipes connects with the top of another smoke-returning box in the said a pair of smoke-returning box, and the other end of right-hand member and said last smoking box connects.

are in another concrete embodiment of the utility model; Has one group of fire grate between described burner hearth and the said burner hearth ash hole; The burner hearth ash hole is positioned at the bottom of fire grate, and each fire grate has the fire grate tube chamber, and the fire grate tube chamber communicates with described water cavity.

are used for the combustion chamber matched with burner being provided with one on the described casing and above corresponding to said burner hearth ash hole in another concrete embodiment of the utility model, this combustion chamber communicates with described flue.

also have among the concrete embodiment the utility model, on described down smoke-discharging case cleaning door, are equipped with down smoke-discharging case cleaning door door.

at more and among concrete embodiment of the utility model, on the front and back wall body of the length direction of said casing, respectively is provided with the heat-insulation layer that is used for said water cavity insulation.

the utility model so that concrete embodiment in, on the front and back wall body of the length direction of described casing and be positioned at the bottom and respectively be provided with at least one blowoff valve.

the utility model again more and among concrete embodiment, said casing is provided with liquid level gauge and thermometer.

are at again and then among concrete embodiment of the utility model; The quantity of described liquid level gauge has two, and one of them liquid level gauge is arranged on the top of said casing, is used to disclose liquid level; And another liquid level gauge is arranged on the bottom of casing, is used to disclose down liquid level.

The technical scheme that the utility model provides by burner hearth, first, second blast pipe realize respectively once, secondary and three air intakes, thereby biomass fuel is fully burnouted, ash is merely 2%, and is not only capable of saving fuel but also can embody environmental protection.

Description of drawings

Fig. 1 is the example structure figure of the utility model.

Fig. 2 is the cutaway view of Fig. 1.

The specific embodiment

can be expressly understood the technical spirit and the beneficial effect of the utility model more for the auditor that the makes Patent Office especially public; The applicant general elaborates with the mode of embodiment below; But the description to embodiment all is not the restriction to the utility model scheme, any according to the utility model design done only for pro forma but not substantial equivalent transformation all should be regarded as the technical scheme category of the utility model.

see also Fig. 1 and Fig. 2; Provided one be cuboid substantially casing 1; This casing 1 has water cavity 11, burner hearth 12, flue 13, burner hearth ash hole 14, casing cleaning door 15 and casing ash hole 16, is example with present location status shown in Figure 1, and separated burner hearth 12, burner hearth ash hole 14, casing cleaning door 15 and the casing ash hole of establishing 16 all is positioned at the left end of casing 1 in water cavity 11; Wherein: burner hearth ash hole 14 is positioned at the below of the fire grate 121 of burner hearth 12; And both communicated with burner hearth 12, and communicated with aforesaid flue 13 again, whole flue 13 is positioned at water cavity 11 with closed state.Aforesaid fire grate 121 has fire grate tube chamber 1211, and fire grate tube chamber 1211 communicates with water cavity 11.Be provided with hearth door 122 at burner hearth 12 head lamp brush guard pivots, and on burner hearth ash hole 14, be equipped with a burner hearth ash hole door 141.Be respectively arranged with at the top of casing 1 the diversion interface 17a that is used in water cavity 11, introducing the water source that communicates with water cavity 11, communicate with water cavity 11 be used for safing vent 17b, be stretched over one group of first blast pipe 17c and one group of one group of second blast pipe 17d that is used for that is stretched in the burner hearth 12 of being used for feeding secondary combustion air in flue 13 in the aforementioned flue 13 to three combustion airs of burner hearth 12 conveyings.And be provided with the water outlet interface 17e that is used for the hot water after heat exchange of water cavity 11 is drawn and respectively be provided with one in the both sides of the length direction of casing 1 in a side of casing 1 and be used for the blowdown interface 17f that the long-pending dirt with water cavity 11 effluxes, also can the hold concurrently effect of water supply connector of this blowdown interface 17f.Preferably, on the wall body of the length direction both sides of casing 1, set up heat-insulation layer 19 again.Also, on casing 1, also be provided with not shown liquid level gauge, the quantity of liquid level gauge has a pair of; One of them liquid level gauge is located at the top of casing 1; Be used to show the last liquid level of the water in the water cavity 11, another liquid level gauge then is located at the bottom of water tank 1, is used for showing the following liquid level of the water of water cavity 11.Also, can be provided with a combustion chamber 18 at the left end of casing 1, this combustion chamber 18 communicates with the below (below of fire grate 121) of aforesaid burner hearth 12; And communicate with flue 13 equally; Its effect is to be used for connecting with burner, so that make the utility model play double action, one is to use biomass fuel; The 2nd, use combustion gas according to needing, thereby make the utility model structure have the flexible selectivity in the application.According to common practise, on casing 1, also be provided with thermometer, show the temperature of the water in the water cavity 11 by thermometer.

a pair of smoke-returning box 2 is arranged in the water cavity 11 parallelly; Be positioned at the left end of casing 1; And correspond respectively to the both sides of aforesaid burner hearth 12; Each smoke-returning box 2 tool is smoke chamber 21 once, and the top of each smoke-returning box 2 extends and to constitute one and be stretched over the outer smoke-returning box cleaning door 22 of water cavity 11, and the bottom is extended with one and extends to the outer smoke-returning box ash hole 23 of backwater cavity equally.Shown in figure; Smoke-returning box cleaning door 22 matches with aforementioned casing cleaning door 15 on being opened in casing 1; And be equipped with a cleaning door door 221, and smoke-returning box ash hole 23 matches with aforementioned casing ash hole 16 on being opened in casing 1, and be equipped with an ash hole door 31.

one go up smoking box 3 and a down smoke-discharging case 4 with about correspondence setting at the right-hand member of casing 1; Be positioned at water cavity 11; Last smoking box 3 has last smoking box chamber 31, has one and is stretched over the outer last smoking box exhaust opening 32 of casing 1 and go up smoking box chamber 31, and down smoke-discharging case 4 has down smoke-discharging case chamber 41; Down smoke-discharging case chamber 41 has one and is stretched over casing 1 down smoke-discharging case cleaning door 42 outward equally, and on down smoke-discharging case cleaning door 42, is furnished with smoking box cleaning door door 42.Wherein: down smoke-discharging case chamber 41 communicates with aforesaid flue 13.

have provided two groups of the bottom that is positioned at water cavity 11 and have returned smoke pipe 5; Every group of quantity of returning smoke pipe 5 has these two groups of complex roots (being not limited to illustrated 12) to return in the smoke pipe 5 wherein one group (being arranged in a group of front side of shown position) to go back to the bottom of the left end of smoke pipe 5 and one of them of aforesaid a pair of smoke-returning box 2 (being positioned at of front side of shown position) smoke-returning box 2 and connect; And communicate with the smoke chamber 21 that returns of this smoke-returning box 2; And an end of right-hand member and down smoke-discharging case 4 connects; And communicate with down smoke-discharging case chamber 41; The bottom of another (being positioned at one < not shown>of the rear side of shown position) smoke-returning box 2 that two groups of one group of another groups (being arranged in the rear side of shown position state) of returning in the smoke pipe 5 are returned left end and a pair of smoke-returning box 2 of smoke pipe 5 connects; And communicate with the smoke-returning box chamber 21 of this another smoke-returning box 2, and the other end of right-hand member and down smoke-discharging case 4 connects, and communicate with down smoke-discharging case chamber 41 equally.Two groups of middle parts of returning smoke pipe 5 all are positioned at water cavity 11.

have provided and have been positioned at water cavity 11 and two groups of pipes 6 that be in water cavity 11 tops; The quantity of every group of pipe 6 has complex root (but be not limited to illustrate quantity 12); The top of in these two groups of pipes 6 wherein one group (being arranged in a group of front side of shown position state) left end of pipe 6 and one of them of a pair of smoke-returning box 2 (being positioned at of front side of shown position) smoke-returning box 2 connects; And communicate with the smoke-returning box chamber 21 of this smoke-returning box 2; And an end of right-hand member and last smoking box 3 connects; And communicate with last smoking box chamber 31, the left end of another group pipe 6 (not shown)s in two groups of pipes 6 and the top of another smoke-returning box 2 (not shown)s in a pair of smoke-returning box 2 connect, and communicate with the smoke-returning box chamber 21 of this another smoke-returning box 2; And the other end of right-hand member and last smoking box 3 connects, and communicates with last smoking box chamber 31.The middle part of two groups of pipes 6 all is positioned at water cavity 11.

Two groups of belows of returning smoke pipe 5 corresponding to two groups of pipes 6 can be known by diagram in ; Be in (wherein: the open degree of hearth door 122 is according to needing adjusting) under the closed condition at cleaning door door 221, ash hole door 231, burner hearth ash hole door 141 and down smoke-discharging case cleaning door 42; The high-temperature flue gas that produces during by burner hearth 12 burnings gets in the down smoke-discharging case chamber 41 of down smoke-discharging case 4 through flue 13; Returning smoke pipe 5 through two groups again gets in the smoke-returning box chamber 21 of a pair of smoke-returning box 2; And then in the last smoking box chamber 31 of the last smoking box 3 of two groups of pipes, 6 entering, the flue gas that is tending towards burnouting comes from goes up smoking box exhaust opening 32.In this process, heat with 6 pairs of water cavities of pipe, 11 interior water by returning smoke pipe 5.

preferably also can be provided with a clean water heat exchanger 7 at the top of casing 1, by the water in the water cavity 11 to its heat exchange.Clean water heat exchanger 7 comprises inlet water tank 71, recovery tank 72, one group of heat exchanger tube 73, one group of return pipe 74 and water tank 75; Inlet water tank 71 and water tank 75 be fixed on casing 1 right-hand member top and be positioned at the outside of casing 1; Recovery tank 72 is fixed on the top of the left end of casing 1; And be positioned at the outside of casing 1 equally, the right-hand member of one group of heat exchanger tube 73 communicates with the inlet water tank case chamber 711 of inlet water tank 71 behind the tank wall that passes casing 1, and left end communicates with the recovery tank case chamber 721 of recovery tank 72 behind the tank wall that passes casing 1; And the middle part is positioned at water cavity 11; The right-hand member of one group of return pipe 74 communicates with water tank 75 behind the tank wall that passes casing 1, and left end communicates with recovery tank 72 behind the tank wall that passes casing 1, and the middle part is positioned at water cavity 11 equally.Shown in figure, on inlet water tank 71, be extended with inlet water tank water inlet interface 712, be used for introducing external water source, and on water tank 75, received a water tank water outlet interface 751 to inlet water tank 71, be used for the water in the water tank 75 is drawn, for use.Preferably, will advance, the shape of cross section of return pipe 71,72 and water tank 75 is designed to semicircle, so that fixing with casing 1 reliably.

applicant describes the use of the utility model; At first open the valve on the pipeline of diversion interface 17a; Diversion in water cavity 11 (water outlet interface 17e and the blowdown interface 17f of this moment are in closed condition); And introduce to inlet water tank 71 through inlet water tank water inlet interface 712, when 75 water outlets of water tank water outlet interface, stop, and close the valve on the pipeline of water tank water outlet interface 75 to inlet water tank 71 diversions.The degree of diversion is disclosed by the liquid level gauge on casing 1 top in water cavity 11.To burner hearth 12 igniting, the biomass fuel that is arranged in (devoting) burner hearth 12 is burnt on fire grate 121, and (owing to the use biomass fuel, so combustion chamber 18 is inoperative; And with lid cap seal combustion chamber), cleaning door door 221, ash hole door 231 and the down smoke-discharging case cleaning door door 42 of this moment all are in closed state, and hearth door 122 also is tending towards closed condition; The flare that burning produces is being carried high-temperature flue gas secretly and is being got into flue 13; And then high-temperature flue gas gets into down smoke-discharging case chamber 41, introduces smoke-returning box 2 through returning smoke pipe 5, and the flue gas that enters into smoke-returning box 2 promptly pass through back flue gas after significantly being lowered the temperature after the water heat exchange of smoke pipe 5 and water cavity 11 through the last smoking box chamber 31 of pipe 6 entering; Smoking box chamber 31 is before by the water heat exchange in pipe 6 and the water cavity on getting into; The temperature of the flue gas that therefore effluxes from last smoke exhaust pipe exhaust opening 32 is lower and be tending towards burnouting, and through metering, ash is merely 2%; Well below the ash of coal, therefore has ultimate attainment energy-conservation and environment protecting.In said process, in flue 13 and burner hearth 12, introduce air respectively by first, second blast pipe 17c, 17d, in order to ensureing combustion efficiency.

When reach the required degree of being reacted by thermometer when the water temperature in the water cavity 11; Can open the valve on the pipeline of water outlet interface 17e; Draw use, draw use according to the valve on the pipeline that needs unlatching water tank water outlet interface 751 simultaneously.

If in the time of will implementing cleaning to the tube chamber that returns smoke pipe 5 and pipe 6; So at dead status; Withdraw cleaning door door 221, ash hole door 231 and down smoke-discharging case cleaning door door 421; To returning the tube chamber mediation of smoke pipe 5 and pipe 6, in the mediation process, enter into go back to smoke chamber 21 bottoms and the flue dust that enters in the down smoke-discharging case chamber 41 goes out clearly and goes out clearly from down smoke-discharging case cleaning door 42 from smoke-returning box ash hole 23 with instrument such as rod member etc., and the ashes that are positioned at fire grate 121 belows are gone out clearly by burner hearth ash hole 14

Claims (10)

1. a kind of energy-conserving and environment-protective biomass fuel boiler, it is characterized in that comprising have water cavity (11), at a distance from the separated casing (1) of burner hearth ash hole (14) of being located at the flue (13) in the water cavity (11) and being positioned at the below of burner hearth (12) of being located at burner hearth (12) in the water cavity (11), communicating with burner hearth (12); What be arranged on said casing (1) left end and both sides that correspond respectively to said burner hearth (12) respectively constitutes a pair of smoke-returning box (2) of smoke chamber (21) once parallelly; Each smoke-returning box (2) is positioned at described water cavity (11); And the top of each smoke-returning box (2) be extended with one with return that smoke chamber (21) communicates and be stretched over the smoke-returning box cleaning door (22) that the outer casing cleaning door (15) with on being opened in casing (1) of water cavity (11) matches, and the bottom be extended with one same with return that smoke chamber (21) communicates and be stretched over the smoke-returning box ash hole (23) that the casing ash hole (16) with on being opened in casing (1) outside the water cavity (11) matches equally; Self be arranged on accordingly said casing (1) right-hand member and be positioned at said water cavity (11) have last smoking box chamber (31) one on smoking box (3) and have the smoking box (4) in down smoke-discharging case chamber (41); Wherein: last smoking box (3) has one and is stretched over the outer last smoking box exhaust opening (32) of casing (1); And down smoke-discharging case (4) has one and is stretched over the outer down smoke-discharging case cleaning door (42) of casing (1), and described flue (13) communicates with described down smoke-discharging case chamber (41); Return smoke pipe (5), be positioned at the bottom of said water cavity (11), the left end and the smoke-returning box (2) that return smoke pipe (5) connect, and communicate with said smoke-returning box chamber (21), and right-hand member and said down smoke-discharging case (4) connect, and communicate with said down smoke-discharging case chamber (41); Pipe (6); Be positioned at the top of said water cavity (11); The left end of pipe (6) and smoke-returning box (2) connect; And communicate with smoke-returning box chamber (21); And right-hand member and the said smoking box (3) of going up connect; And communicate with last smoking box chamber (31), wherein: first blast pipe (17c) that be provided with the diversion interface (17a) that is used for diversion in said water cavity (11) at the top of said casing (1), be insinuated into vent (17b) in the water cavity (11), a group communicates with said flue (13) is used for introducing outside air to flue (13) with one group communicate with burner hearth (12) be used for second blast pipe (17d) to burner hearth (12) introducing outside air, and be provided with the water outlet interface (17e) that communicates with said water cavity (11) in the bottom of a side of casing (1) length direction.

2. energy-conserving and environment-protective biomass fuel boiler according to claim 1; The quantity that it is characterized in that described time smoke pipe (5) has two groups; Every group has complex root; These two groups return in the smoke pipe (5) wherein one group return the left end of smoke pipe (5) and the bottom of one of them smoke-returning box (2) in the described a pair of smoke-returning box (2) connects; And an end of right-hand member and said down smoke-discharging case (4) connects, and two groups are returned that in the smoke pipe (5) another organized back the left end of smoke pipe (5) and the bottom of another smoke-returning box (2) in the described a pair of smoke-returning box (2) connects, and the other end of right-hand member and said down smoke-discharging case (4) connects.

3. energy-conserving and environment-protective biomass fuel boiler according to claim 1; The quantity that it is characterized in that described smoke exhaust pipe (6) has two groups; Every group has complex root; The left end of the wherein one group of pipe (6) in these two groups of pipes (6) and the top of one of them smoke-returning box (2) in the described a pair of smoke-returning box (2) connect; And a right-hand member and a said end of going up smoking box (3) connect, and the left end of another group pipe (6) in two groups of pipes (6) and the top of another smoke-returning box (2) in the said a pair of smoke-returning box (2) connect, and the right-hand member and the said other end of going up smoking box (3) connect.

4. energy-conserving and environment-protective biomass fuel boiler according to claim 1; It is characterized in that having one group of fire grate (121) between described burner hearth (12) and the said burner hearth ash hole (14); Burner hearth ash hole (14) is positioned at the bottom of fire grate (121); Each fire grate (121) has fire grate tube chamber (1211), and fire grate tube chamber (1211) communicates with described water cavity (11).

5. energy-conserving and environment-protective biomass fuel boiler according to claim 1; It is characterized in that on described casing (1) and be provided with one in the top corresponding to said burner hearth ash hole (14) being used for the combustion chamber matched with burner (18), this combustion chamber (18) communicate with described flue (13).

6. energy-conserving and environment-protective biomass fuel boiler according to claim 1 is characterized in that on described down smoke-discharging case cleaning door (42), being equipped with down smoke-discharging case cleaning door door (421).

7. according to claim 1 or 6 described energy-conserving and environment-protective biomass fuel boilers, it is characterized in that on the front and back wall body of the length direction of said casing (1), respectively being provided with the heat-insulation layer (19) that is used for said water cavity (11) insulation.

8. energy-conserving and environment-protective biomass fuel boiler according to claim 7 is characterized in that on the front and back wall body of the length direction of described casing (1) and is positioned at the bottom respectively being provided with at least one blowoff valve (17f).

9. energy-conserving and environment-protective biomass fuel boiler according to claim 8 is characterized in that said casing (1) is provided with liquid level gauge and thermometer.

10. Energy-conserving and environment-protective biomass fuel boiler according to claim 9; The quantity that it is characterized in that described liquid level gauge has two, and one of them liquid level gauge is arranged on the top of said casing (1), is used to disclose liquid level; And another liquid level gauge is arranged on the bottom of casing (1), is used to disclose down liquid level

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