CN215294982U

CN215294982U - Biomass boiler feeding system

Info

Publication number: CN215294982U
Application number: CN202120501829.5U
Authority: CN
Inventors: 曾其刚
Original assignee: Heilongjiang Huare Energy Co ltd
Current assignee: Heilongjiang Huare Energy Co ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-12-24
Anticipated expiration: 2031-03-09

Abstract

A biomass boiler feeding system belongs to the field of biomass boilers. The utility model discloses a feed bin bottom and second grade screw feeder intercommunication cooperation installation, second grade screw feeder and inlet pipe intercommunication cooperation installation, inlet pipe and blanking pipe intercommunication cooperation installation, blanking pipe and furnace intercommunication cooperation installation, bellows respectively with inlet pipe and blanking pipe intercommunication cooperation installation, the inlet pipe is from last to fitting down in proper order and installing pneumatic quick shutoff valve, weight formula lever valve and metal expansion joint, the cooperation of blanking pipe bottom is installed and is fluidized air bellows, fluidized air bellows and bellows intercommunication cooperation installation, bellows and fan cooperation installation. The purpose is in order to solve the problem that the unit can not realize long-period operation due to material blockage, shaft breakage and shaftless spiral fracture of the front feeding system of the power plant in the current biomass industry, the labor intensity of operators is reduced, the electricity consumption is saved, the primary investment cost, the repeated investment cost and the maintenance cost are saved, and the aim of long-period operation of the unit is realized.

Description

Biomass boiler feeding system

Technical Field

The utility model relates to a biomass boiler feed system belongs to the biomass boiler field.

Background

By the end of 2019, the installed capacity of biomass power generation in China reaches 2254 ten thousand KWH, and the installed capacity is increased by 26.6 percent on year-by-year basis; biomass power generation is 11111 hundred million KWH, which is increased by 20.4 percent on a par. In various biomass energy at the end of 2019, the installed capacity of the waste incineration power generation accounts for 53 percent of the total capacity of the biomass power generation installed machines, and the rank is first; the ratio of the installed power generation capacity of the agricultural and forestry waste is 43 percent; the installed capacity of the methane power generation accounts for 4 percent. If 43 percent of the installed capacity of the biomass in 2254 ten thousand KWH is calculated by 3 furnaces on average, about 323 agricultural and forestry waste biomass boilers.

The national development and transformation committee brings the construction conditions of the energy consumption online monitoring systems of key energy consumption units in various regions into the double-control target responsibility evaluation and assessment of the energy consumption total amount and the intensity of provincial people governments, provides data support for energy-saving macroscopic management, atmospheric pollution control and supervision and law enforcement, and helps to boost the inevitable trend of heat supply and power generation transformation of heat supply units and small coal-fired power plants to biomass clean energy. The cost reduction, efficiency improvement, energy conservation, emission reduction and blue sky defense war well are great and arduous persistent war, and the biomass boiler also becomes an indispensable 'legal treasure' in the blue sky defense war.

However, the layout of the feeder in front of the existing biomass boiler has the following problems:

1. stokehole feeding system process flow

In the biomass straw fuel: straw, corn stalk, wheat straw, soybean pole are after the fuel field breaks into the length below 20MM, get into the belt through the reposition of redundant personnel of ground feed system, and rethread belt transport to stokehold one-level feed bin, take 30MW or 40MW unit as an example, stokehold feed system constitutes 4 sets of two sets as a set of by 8 one-level screw feeders of length 7-9 meters respectively, correspond 4 feed openings with the fuel in the feed bin, carry to stokehold 4 second grade shaftless screw feeders or the double screw feeder of length 4-6 meters, carry to the furnace chamber burning.

2. Material feeder

The material of the main shaft of the primary screw feeder: is made by rolling a stainless steel plate with the thickness of 10 MM;

the material of the second-stage shaftless feeder is as follows: the shaftless feeder is made of common carbon steel; the screw feeder is formed by rolling a 10MM stainless steel plate.

3. Mode for adjusting feeding machine in operation

The 130MW or 40MW unit I and the feeder generally adopt a motor with voltage of 380V and power of 12-15KW and a 4-6 level variable frequency regulation mode;

the secondary feeder of the 230MW or 40MW unit generally adopts a motor with voltage of 380V and power of 15-22KW and a power frequency adjusting mode.

4. Problems to be solved

1 frequent blockage and breakage of a secondary feeding system in front of a boiler of a domestic biomass power plant, which leads to the fact that a unit cannot run for a long period, is one of the main problems faced by the boiler of the current biomass power plant.

2, a feeding system feeder manufacturer generally adopts a shaftless screw, a single-shaft screw and a double-shaft screw for secondary feeding, but no matter which screw is adopted for feeding, the phenomena of material blocking and breakage can be generated, only the length of the operation time is short, especially the shaftless screw feeder runs for half a month and a month under the condition of blending and burning more than 50 percent of straws, the breakage phenomenon occurs for at most one month and a half a month, then the repeated breakage trend occurs, and finally only a new screw needs to be replaced, so that the investment cost, the maintenance cost and the plant power consumption rate of a construction unit are greatly increased; the spiral with the shaft, whether a single spiral or a double spiral, has huge volume and large motor power, generally 4 or 8 motors with 15-22KW are used, the running life is generally half a year or a year, the motor can also be broken at different parts and in different degrees, the investment cost is higher, common manufacturers adopt double spirals, and the plant power consumption is higher; whether shaftless screws or shafted screws, the equipment maintenance cost is high, and the service power is increased, which is a common point of the shaftless screws and the shafted screws.

3 because the feeding system frequently blocks up, breaks, causes the unit to bring the full load in the operation, also can't realize long period operation, this kind of bad phenomenon has still increased the operating personnel's intensity of labour, has increased the investment cost, the maintenance cost of construction unit, and worst result leads to the enterprise to profit a little thin year, even the loss state appears.

Reasons for material blockage and fracture of the furnace front secondary feeder:

1. the stokehole feeding system of the biomass power plant in China almost adopts a two-stage feeding mode, most biomass power plants in south mostly use comprehensive fuel of agricultural and forestry wastes, the proportion of straws is only 30-40%, the relative blocking and breaking frequency of the secondary feeding system is low, but the blocking and breaking phenomena of the secondary feeding machine still exist; but the main fuel of the biomass power plant in the north of China mainly comprises rice straws, corn stalks and soybean stalks, wherein the proportion of the straws is 50-90%; this results in a significant increase in the frequency of furnace front secondary feed plugging and breakage.

2. Because the moisture of the biomass fuel is relatively large, the moisture in the biomass fuel is basically over 30 percent, and the toughness, the strength and the friction degree of the straws, the corn stalks and the barks are greatly increased due to the large moisture; although an enterprise is provided with a crusher for fuel, the crushing grain size is below 15MM, the problems of high crushing power consumption, crushing time, crusher maintenance time, high spare part consumption and the like are increased, if the crushing output cannot be achieved, the full load consumption of a boiler cannot be met, so that the enterprise usually only needs to adjust the grain size of the biomass fuel to the range of 10-20MM, the transportation resistance of the fuel is increased, the frequency of fuel blockage, abrasion and fracture of a feeding system in the south is low, and the phenomenon is frequent in the north.

3. The fuel contains more impurities, such as: the device comprises stones, bricks, iron devices, cloth, straw packing ropes and the like, and the stones, the bricks, the iron devices, the cloth, the straw packing ropes and the like mainly come from the reasons that the fuel supplier does not harden the stacking points of ash bars or wood fuels in the field, the sundries are more, and the like.

4. The quality problem of manufacturers is as follows: unqualified heat treatment in the production process, failure in process requirements, improper material selection, unreasonable design and the like.

5. The installation problem is as follows: the bolts are not fastened and the shafts are not concentric.

6. Unreasonable design position: the distance between the secondary feeder and the boiler body is too long, the secondary feeder is generally designed to be 4.5-7 meters, the barrel body of the stranding cage is too long, the torque of the spiral is increased, the humidity of the straw fuel is high, the resistance is high, and the spiral is broken due to the addition of material blockage.

In summary, the following steps: the factors are factors causing fracture of the secondary screw feeder of the feeding system of the biomass power plant, and the fracture of the secondary screw feeder is accelerated by comprehensively adding the factors.

Therefore, there is a need to provide a new feeding system for biomass boiler to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses research and development purpose is in order to solve the stokehold feed system putty of current biomass industry power plant, disconnected axle and no axle spiral fracture, leads to the unable problem that realizes long period operation of unit, has given about in the following the utility model discloses a brief summary to provide about the utility model discloses a basic understanding of some aspects. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.

The technical scheme of the utility model:

the utility model provides a biomass boiler feed system, including the feed bin, second grade screw feeder, the inlet pipe, the blanking pipe, bellows, pneumatic quick shutoff valve, the weight formula lever valve, the metal expansion joint, fluidization wind bellows and fan, feed bin bottom and second grade screw feeder intercommunication cooperation installation, second grade screw feeder and inlet pipe intercommunication cooperation installation, inlet pipe and blanking pipe intercommunication cooperation installation, blanking pipe and furnace intercommunication cooperation installation, bellows respectively with inlet pipe and blanking pipe intercommunication cooperation installation, the inlet pipe is from last to fitting in proper order down installs pneumatic quick shutoff valve, weight formula lever valve and metal expansion joint, fluidization wind bellows is installed in the cooperation of blanking pipe bottom, fluidization wind bellows and bellows intercommunication cooperation installation, bellows and fan cooperation installation.

Preferably: and a pressure sensor is arranged on the feeding pipe between the pneumatic quick shutoff valve and the weight type lever valve.

Preferably: and a temperature sensor is arranged on the feeding pipe between the weight type lever valve and the metal expansion joint.

Preferably: and a temperature sensor is arranged on the blanking pipe.

Preferably: the air channel stop valve is installed in the department that communicates with the inlet pipe of bellows, and the department that communicates of bellows and inlet pipe and blanking pipe all sets up installs the air channel stop valve.

Preferably: the fluidized air bellow is communicated and matched with the blanking pipe through a fluidized air nozzle.

Preferably: and the air inlet of the fan is communicated with an air door of an inlet of a circulating fan on the flue gas pipeline.

Preferably: and the air outlet of the fan is communicated with an outlet air door of the circulating fan on the flue gas pipeline.

Preferably: the feeding pipe is vertically arranged, and the side wall of the blanking pipe and the side wall of the hearth form an included angle of 60 degrees.

Preferably: the two-stage screw feeders are vertically communicated in parallel by two one-stage screw feeders.

The utility model discloses following beneficial effect has:

1. the utility model discloses a biomass boiler feeding system, which not only reduces the labor intensity of operators and saves station service power, but also saves the primary investment cost, the repeated investment cost and the maintenance cost of construction units, and simultaneously realizes the aim of long-period operation of units;

2. the utility model discloses a biomass boiler feeding system, fuel is carried, is dry, sealed wind, has adopted the flue gas that discharges, sends into furnace through high-pressure circulating fan, has reduced the flue gas emission, and the harmful gas part in the flue gas circulates to get back to furnace secondary low nitrogen anaerobic combustion simultaneously, has reduced NOX's formation volume, has saved the investment cost of environmental protection chemical industry auxiliary material;

3. the biomass boiler feeding system of the utility model has no secondary screw, removes the arrangement of a secondary traditional feeder, saves the equipment investment cost, has simple fuel conveying performance, safety and reliability and strong practicability, ensures the long-period operation of the unit, and improves the overall thermal efficiency of the whole plant;

4. the utility model discloses a biomass boiler feed system has avoidd the all kinds of problems that exist in the design of tradition nature feed system, and the suitability is wider, can be applicable to the unit below 80MW, has security, practicality, maneuverability and reliability, and design benefit is suitable for and uses widely.

Drawings

FIG. 1 is a schematic structural diagram of a biomass boiler feed system;

in the figure, 0-hearth, 1-storage bin, 2-secondary screw feeder, 3-feeding pipe, 4-blanking pipe, 5-air box, 6-pneumatic quick shutoff valve, 7-heavy hammer type lever valve, 8-metal expansion joint, 9-fluidized air box, 10-air fan, 11-pressure sensor, 12-temperature sensor, 13-air channel stop valve, 14-flue gas pipeline, 15-circulating fan inlet air door, 16-circulating fan outlet air door, 17-air pressure dividing meter and 18-primary screw feeder.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The utility model discloses the connection that mentions divide into fixed connection and can dismantle the connection, fixed connection is for the conventional fixed connection mode such as undetachable connection including but not limited to hem connection, rivet connection, adhesive connection and welded connection, can dismantle the connection including but not limited to conventional dismantlement modes such as threaded connection, buckle connection, pin joint and hinged joint, when not clearly prescribing a limit to concrete connection mode, acquiesces to always can find at least one kind of connected mode in current connected mode and can realize this function, and the technical staff in the art can select by oneself as required. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.

The first embodiment is as follows: the embodiment is described with reference to fig. 1, the biomass boiler feeding system of the embodiment comprises a storage bin 1, a secondary screw feeder 2, a feeding pipe 3, a blanking pipe 4, an air box 5, a pneumatic quick shutoff valve 6, a weighted lever valve 7, a metal expansion joint 8, a fluidized air box 9 and a fan 10, wherein the bottom of the storage bin 1 is communicated and matched with the secondary screw feeder 2, the secondary screw feeder 2 is communicated and matched with the feeding pipe 3, the feeding pipe 3 is communicated and matched with the blanking pipe 4, the blanking pipe 4 is communicated and matched with a hearth 0, the air box 5 is respectively communicated and matched with the feeding pipe 3 and the blanking pipe 4, the feeding pipe 3 is sequentially provided with the pneumatic quick shutoff valve 6, the weighted lever valve 7 and the metal expansion joint 8 from top to bottom in a matched manner, the fluidized air box 9 is arranged at the bottom of the blanking pipe 4, and the fluidized air box 9 is communicated and matched with the air box 5, the air box 5 is matched with the fan 10;

the design that the air box 5 is respectively communicated and matched with the feeding pipe 3 and the blanking pipe 4 plays roles in drying, sealing and fuel conveying;

if the furnace flue gas back-flowing occurs when the material is cut off, the weight type lever valve 7 can play a role of self-closing under the action of positive pressure;

when the pneumatic quick cut-off valve 6 on the feeding pipe 3 receives the temperature and the certain pressure of the reverse movement of the flue gas in the hearth 0, and any signal meets the design value, the pneumatic quick cut-off valve 6 can be quickly closed, and the pneumatic quick cut-off valve and the weight type lever valve 7 play a role in preventing the reverse movement of the flue gas;

the metal expansion joint 8 plays a role in achieving the purpose that the feeding pipe 3 freely expands along with the environmental temperature difference and the hearth so as to prevent damage;

the air box 5 plays the role of receiving and distributing air volume;

the bunker 1 is used for storing biomass fuel;

the secondary screw feeder 2 is used for conveying the size of the distributed fuel quantity.

The second embodiment is as follows: referring to fig. 1, the feeding system of the biomass boiler of the present embodiment is described, and a pressure sensor 11 is installed on the feeding pipe 3 between the pneumatic quick-closing valve 6 and the weight type lever valve 7.

The third concrete implementation mode: referring to fig. 1, the feeding system of the biomass boiler of the present embodiment is described, and a pressure sensor 11 is installed on the feeding pipe 3 between the pneumatic quick-closing valve 6 and the weight type lever valve 7.

The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the biomass boiler feeding system of the embodiment is characterized in that a temperature sensor 12 is installed on the blanking pipe 4, and the pressure sensor 11 and the temperature sensor 12 are used for closing the pneumatic quick shut-off valve 6 arranged on the feeding pipe 3 at a high speed when receiving a signal if the flue gas of the furnace chamber 0 flows backwards and any condition of temperature or pressure meets the action of the pneumatic quick shut-off valve 6 under the condition of material interruption, so as to prevent the high-temperature flue gas from flowing backwards and entering the secondary screw feeder 2.

The fifth concrete implementation mode: the embodiment is described by combining fig. 1, and the biomass boiler feeding system of the embodiment is characterized in that an air duct stop valve 13 is arranged at the communication position of an air box 5 and an inlet pipe 3, the air channel stop valve 13 is arranged at the communication position of the air box 5, the inlet pipe 3 and a blanking pipe 4, an air distribution pressure gauge 17 is arranged on the air box 5, the air duct stop valve 13 is designed and used for adjusting the air quantity to match the feeding air quantity, and the other function is to cut off an air source when the maintenance or treatment equipment is abnormal, so that the online maintenance is facilitated.

The sixth specific implementation mode: the embodiment is described with reference to fig. 1, and the fluidized air box 9 of the biomass boiler feeding system of the embodiment is communicated and matched with the blanking pipe 4 through a fluidized air nozzle, and the fluidized air nozzle is designed to perform the functions of microfluidizing fuel in the blanking pipe, reducing resistance, preventing blockage and preventing flue gas of a sealed hearth from flowing backwards.

The seventh embodiment: referring to fig. 1, the feeding system of the biomass boiler of the present embodiment is described, and an air inlet of the fan 10 is installed in communication with an inlet damper 15 of a circulating fan on a flue gas pipeline 14.

The specific implementation mode is eight: the embodiment is described with reference to fig. 1, in the biomass boiler feeding system of the embodiment, an air outlet of the fan 10 is installed in communication with an outlet air door 16 of a circulating fan on a flue gas pipeline 14, an inlet air door 15 of the circulating fan and the outlet air door 16 of the circulating fan are designed to adjust the air volume to match the feeding air volume, and another function is to cut off an air source when the equipment is abnormally maintained or treated, so as to facilitate online maintenance;

a path of flue gas is guided from the outlet of the induced draft fan, a flue gas recirculation fan 10 and a control system are arranged at zero meter of the boiler, and the control system is designed to be started and stopped locally or remotely. Air boxes 5 are arranged on 4 circular blanking pipes 4 in front of the furnace, and are respectively connected to the heads of the 4 corresponding circular blanking pipes 4 and the fluidized air boxes 9, and air channel stop valves 13 are respectively arranged.

The specific implementation method nine: the feeding system of the biomass boiler is described by combining fig. 1, the feeding pipe 3 is vertically arranged, the side wall of the blanking pipe 4 and the side wall of the hearth 0 form an included angle of 60 degrees, the blanking pipe 4 connected with the hearth 0 is arranged to be a round pipe, so that the resistance of fuel is reduced, the angle of inclination of 60 degrees is designed, and the air conveying and supplying are added, so that the normal blanking of the fuel is ensured, and the blockage of the blanking pipe cannot be caused by large particles and impurities in the fuel.

The detailed implementation mode is ten: the embodiment is described with reference to fig. 1, and the secondary screw feeder 2 of the biomass boiler feeding system of the embodiment is formed by vertically and parallelly communicating two primary screw feeders 18, so that the transmission device of the whole secondary feeder of the feeding system is removed, and the integrity of the design device of the primary screw feeders of the feeding system is maintained;

the original feeding system is characterized in that fuel after ground stock ground is crushed is conveyed to a stokehole bin through a conveying line, the fuel in the bin is divided into 4 groups by 8 primary screw feeders and falls to 4 secondary feeders in the stokehole through 4 blanking pipes corresponding to bin outlets, and then the fuel is conveyed to a hearth for combustion by the secondary screw feeders.

The two-stage screw feeder 2 is a two-stage screw feeder 2 which is formed by removing a transmission motor and various types of screws of the existing two-stage screw feeder, namely, a screw system is not arranged, two one-stage screw feeders are combined in parallel to form the two-stage screw feeder 2, the feeding pipe 3 is designed into a square feeding pipe 3, a metal expansion joint 8, sealing air, a weight type lever valve 7, a temperature sensor 12, a pressure sensor 11 and a pneumatic quick shutoff valve 6 are additionally arranged on the square feeding pipe 3, a blanking pipe 4 is designed into a cylindrical blanking pipe and is directly butted with feeding ports of a boiler body 4 designed according to the unit capacity, the feeding port of the boiler body is designed in a micro negative pressure area of a hearth 0, the cylindrical blanking pipe 4 takes the verticality of a boiler water wall as a plane, the cylindrical blanking pipe 4 is designed to be connected with the feeding port of the hearth to form an inclination angle of 60 degrees, and a fluidized air nozzle and an air box 5 are additionally arranged at the bottom of the circular blanking pipe 4, the head of the cylindrical blanking pipe 4 is additionally provided with an air box 5 and an air distribution pressure gauge 17;

when fuel falls into 4 square feeding pipes 3 from the outlet of the bin through two primary screw feeders 18 respectively and enters the cylindrical blanking pipe 4 with an inclination angle of 60 degrees, the fuel smoothly enters the hearth 0 to burn under the action of negative pressure of the hearth and dry air, fluidized air, sealing air and conveying air arranged on the cylindrical blanking pipe 4. Arrange sufficient wind pressure amount of wind, not only can play the effect of carrying smoothly, dry fuel, can effectively overcome 0 flue gas of furnace and scurry simultaneously, play sealed effect.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore, the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A biomass boiler feed system characterized in that: comprises a storage bin (1), a secondary screw feeder (2), a feeding pipe (3), a blanking pipe (4), an air box (5), a pneumatic quick shutoff valve (6), a weighted lever valve (7), a metal expansion joint (8), a fluidized air box (9) and a fan (10), wherein the bottom of the storage bin (1) is communicated with the secondary screw feeder (2) for matching installation, the secondary screw feeder (2) is communicated with the feeding pipe (3) for matching installation, the feeding pipe (3) is communicated with the blanking pipe (4) for matching installation, the blanking pipe (4) is communicated with a furnace chamber (0) for matching installation, the air box (5) is respectively communicated with the feeding pipe (3) and the blanking pipe (4) for matching installation, the feeding pipe (3) is sequentially provided with the pneumatic quick lever shutoff valve (6), the weighted lever valve (7) and the metal expansion joint (8) from top to bottom, the fluidized air box (9) is matched and installed at the bottom of the blanking pipe (4), the fluidized air box (9) is communicated with the air box (5) and is installed in a matching way, and the air box (5) is installed in a matching way with the fan (10).

2. A biomass boiler feed system according to claim 1, wherein: and a pressure sensor (11) is arranged on the feeding pipe (3) between the pneumatic quick-closing valve (6) and the weight type lever valve (7).

3. A biomass boiler feed system according to claim 2, wherein: and a temperature sensor (12) is arranged on the blanking pipe (4).

4. A biomass boiler feed system according to claim 1, wherein: air bellow (5) and inlet pipe (3) intercommunication department set up and install wind channel stop valve (13), and air bellow (5) all sets up with the intercommunication department of inlet pipe (3) and blanking pipe (4) and installs wind channel stop valve (13), is provided with on air bellow (5) and divides wind pressure meter (17).

5. A biomass boiler feed system according to claim 4, wherein: the fluidized air box (9) is communicated and matched with the blanking pipe (4) through a fluidized air nozzle.

6. A biomass boiler feed system according to claim 1, wherein: and an air inlet of the fan (10) is communicated with an inlet air door (15) of a circulating fan on the flue gas pipeline (14).

7. A biomass boiler feed system according to claim 6, wherein: and an air outlet of the fan (10) is communicated with an outlet air door (16) of the circulating fan on the flue gas pipeline (14).

8. A biomass boiler feed system according to any one of claims 1 to 7, wherein: the feeding pipe (3) is vertically arranged, and the side wall of the blanking pipe (4) and the side wall of the hearth (0) are arranged at an included angle of 60 degrees.

9. A biomass boiler feed system according to claim 8, wherein: the two-stage screw feeder (2) is formed by vertically and parallelly communicating two one-stage screw feeders (18).