CN110397916B - Continuous automatic feeding device and method for pressurized fluidized bed - Google Patents
Continuous automatic feeding device and method for pressurized fluidized bed Download PDFInfo
- Publication number
- CN110397916B CN110397916B CN201910584550.5A CN201910584550A CN110397916B CN 110397916 B CN110397916 B CN 110397916B CN 201910584550 A CN201910584550 A CN 201910584550A CN 110397916 B CN110397916 B CN 110397916B
- Authority
- CN
- China
- Prior art keywords
- fuel bin
- fluidized bed
- bin
- pressurized fluidized
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a pressurized fluidized bed continuous automatic feeding device and a pressurized fluidized bed continuous automatic feeding method, which comprise a primary fuel bin, a secondary fuel bin and a spiral feeder which are sequentially connected from top to bottom, wherein the outlet of the spiral feeder is connected with a pressurized fluidized bed, the top of the primary fuel bin is provided with a fuel inlet device, the interiors of the primary fuel bin and the secondary fuel bin are respectively provided with a material level sensor and a pressure sensor, the tops of the primary fuel bin and the secondary fuel bin are respectively connected with an air supply pressure supplementing device, the tops of feeding pipes of the primary fuel bin and the secondary fuel bin are provided with a material stirring device, an electric valve is arranged below the material stirring device, and the inlet. The invention adopts a design mode of combining two-stage fuel bins, an air supply pressure supplementing device, an exhaust device and an electric valve, and combines a pressure sensor and a material level sensor, thereby realizing continuous feeding when a pressurized fluidized bed works; automatic feeding of the pressurized fluidized bed is realized by automatic control means such as feedback regulation and the like; the fuel blockage is prevented by the material stirring device.
Description
Technical Field
The invention relates to an automatic continuous feeding device and method, in particular to a continuous automatic feeding device and method for a pressurized fluidized bed.
Background
In Paris protocol, China independently promises to realize unit GDP emission reduction and increase proportion of non-fossil energy to primary energy. In recent years, the biomass energy consumption of China has become higher and higher in proportion to primary energy. The coal and the biomass are combusted together, so that the use amount of the coal can be reduced, the emission amount of pollution gas is reduced, and the greenhouse effect is relieved. Meanwhile, the pressurized fluidized bed has the advantages of high combustion efficiency, high desulfurization efficiency and the like, and the coal and biomass mixed fuel can be combusted together in the pressurized fluidized bed, so that the pressurized fluidized bed has a wide prospect.
Because the pressure of the pressurized fluidized bed is higher, pressure difference exists between the feeding device and the pressurized fluidized bed, and the feeding device of the normal pressure fluidized bed cannot be used in the pressurized fluidized bed. And the biomass particles and the coal particles have great difference in size, density and the like, and the coal and biomass mixed fuel is easy to block at a discharge hole of a fuel bin, so that the stability of a feeding device is influenced, and the combustion efficiency of a combustor is reduced. The existing charging device of the pressurized fluidized bed adopts a mode of single-stage fuel bin ventilation and pressure compensation, and is difficult to realize automatic continuous charging; the manufacturing and maintenance costs of the pressurized mechanical feeding mode are too high, and the economical efficiency is low. Most of the existing fuel feeding devices are designed for single coal or biomass fuel, and the problems that a discharge port of a fuel bunker is blocked and the like when the coal and the biomass are fed together cannot be effectively solved.
Patent application with publication number CN108679602A discloses a pressurized fluidized bed secondary air cooperative feeding device and method, which adopts a single-stage fuel bin aeration pressure-supplementing mode to realize the feeding of the pressurized fluidized bed, but the device cannot realize the automatic continuous feeding of the pressurized fluidized bed. Patent application publication No. CN208086809U discloses a feeding device for a fluidized bed, which realizes the feeding of the fluidized bed by extracting air in the fluidized bed to generate a pressure difference inside and outside the fluidized bed body, but the device destroys the pressure atmosphere in the fluidized bed and is not suitable for a pressurized fluidized bed. Patent application with publication number CN105114946A discloses a fluidized bed mixed feeding device for coal and biomass, in which dead zones are easily formed in the design of a bunker, and an air recoil device in the device cannot well control the air speed, so that the device has no wide applicability to solving the problem of fuel blockage at a discharge port of the bunker, and is not suitable for a pressurized fluidized bed.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a continuous automatic feeding device and a feeding method for a pressurized fluidized bed, which solve the problems of fuel bin blockage and automatic feeding when coal and biomass in the pressurized fluidized bed are mixed and fed.
The technical scheme is as follows: the invention comprises a primary fuel bin, a secondary fuel bin and a spiral feeder which are sequentially connected from top to bottom, wherein the outlet of the spiral feeder is connected with a pressurized fluidized bed, the top of the primary fuel bin is provided with a fuel inlet device, the insides of the primary fuel bin and the secondary fuel bin are respectively provided with a material level sensor and a pressure sensor, the tops of the primary fuel bin and the secondary fuel bin are respectively connected with an air supply pressure supplementing device, the tops of the feeding pipes of the primary fuel bin and the secondary fuel bin are provided with a material stirring device, an electric valve is arranged below the material stirring device, and the inlet of the spiral feeder.
The material stirring device comprises a cylindrical shaft and stirring nails, wherein an upper row of stirring nails and a lower row of stirring nails are arranged on the cylindrical shaft, the upper row of stirring nails and the lower row of stirring nails are the same in length and different in spacing, and the end part of the cylindrical shaft is connected with a motor.
The primary fuel bin and the secondary fuel bin are composed of an upper cylindrical structure and a lower frustum structure, and the included angle between the frustum and the horizontal direction is larger than the minimum fuel sliding angle.
The material level sensor comprises a high level material level sensor and a low level material level sensor, and the installation distance between the high level material level sensor and the top of the corresponding fuel bunker is 20-30 mm; the installation distance between the low level sensor and the material stirring device below the low level sensor is 20-30 mm.
The fuel inlet device comprises an electromagnetic rail, a feeding port and a sealing cover, wherein the sealing cover can slide on the electromagnetic rail.
The top of the primary fuel bin is also connected with an exhaust device.
The fuel inlet device, the air supply pressure supplementing device, the exhaust device, the electric valve and the material poking device are all driven by electromagnetism or electricity and are provided with corresponding signal sensors.
The inclination angle of the screw feeder and the horizontal direction is less than 15 degrees.
The charging mode of the continuous automatic charging device of the pressurized fluidized bed comprises the following steps:
1) the feeding device stores materials in advance:
(1) closing the screw feeder, enabling all the material stirring devices of the whole set of feeding device to be closed and reset by the closing signal output by the screw feeder, starting the fuel inlet device for feeding, and stopping feeding when a high-level material level sensor in the primary fuel bin gives an alarm;
(2) starting a material stirring device at the bottom of the primary fuel bin, enabling fuel to enter the secondary fuel bin from the primary fuel bin, and closing the material stirring device at the bottom of the primary fuel bin when a high-level material level sensor in the secondary fuel bin or a low-level material level sensor in the primary fuel bin gives an alarm;
(3) feeding the primary fuel bin, stopping feeding when a high-level material level sensor in the primary fuel bin gives an alarm, and closing a fuel inlet device;
2) charging the pressurized fluidized bed during working:
(1) starting the screw feeder, and enabling the fuel to enter the pressurized fluidized bed from the secondary fuel bin through the screw feeder;
(2) the pressurized fluidized bed starts to be pressurized, and when the pressure in the pressurized fluidized bed is higher than the pressure in the secondary fuel bin, the gas supply pressure supplementing device at the top of the secondary fuel bin is started to balance the pressure in the secondary fuel bin and the pressurized fluidized bed;
(3) a low-level material level sensor in the secondary fuel bin gives an alarm, when the pressure in the secondary fuel bin is higher than the pressure in the primary fuel bin, an air supply pressure supplementing device at the top of the primary fuel bin is started, so that the pressure in the primary fuel bin is the same as the pressure in the secondary fuel bin, a material stirring device at the bottom of the primary fuel bin is started, and fuel enters the secondary fuel bin;
(4) when a high-level material level sensor in the secondary fuel bin or a low-level material level sensor in the primary fuel bin gives an alarm, starting an exhaust device at the top of the primary fuel bin until the pressure in the primary fuel bin is the same as the ambient pressure, and then starting a fuel inlet device until the high-level material level sensor in the primary fuel bin gives an alarm, stopping feeding;
(5) when the pressurized fluidized bed works, the materials are circularly added according to the steps.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the invention adopts a design mode of combining two-stage fuel bins, an air supply pressure supplementing device, an exhaust device and an electric valve, and combines a pressure sensor and a material level sensor, thereby realizing continuous feeding when a pressurized fluidized bed works, solving the problem that the single-stage fuel bin ventilation pressure supplementing feeding mode can not realize continuous feeding;
2. in the invention, except for the material level sensor and the pressure sensor, the fuel inlet device, the gas supply and pressure supplementing device, the exhaust device, the electric valve and the material stirring device are all driven by electromagnetism or electricity and are provided with corresponding signal sensors, and automatic control means such as feedback adjustment and the like are adopted, so that the automatic charging of the pressurized fluidized bed is realized, and compared with manual charging, the automatic charging of the pressurized fluidized bed has better safety while saving manpower;
3. the material stirring devices are respectively arranged at the connecting part of the primary fuel bin and the blanking pipe, the connecting part of the secondary fuel bin and the blanking pipe and the feeding hole of the spiral feeder, and are used for stirring materials when the coal and biomass mixed fuel is blanked, so that the blockage of the coal and biomass mixed fuel at the discharging hole of the fuel bin is avoided; according to the mixed fuels with different sizes, the fuel poking device can poke the fuels by adjusting the lengths of the poking nails, the distances among the poking nails and the rotating speed of the cylindrical shaft, and compared with the method of using air recoil equipment to avoid fuel blockage, the fuel poking device has a better application range;
4. the fuel inlet device is electromagnetically driven and consists of an electromagnetic rail, a circular feeding port and a circular feeding port cover plate, wherein the circular feeding port cover plate reciprocates on the electromagnetic rail to open and close the circular feeding port.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a fuel inlet arrangement of the present invention;
fig. 3 is a schematic view of the setting device of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings. As shown in figure 1, the invention comprises a primary fuel bin 5, a secondary fuel bin 10 and a screw feeder 14 which are connected in sequence from top to bottom, wherein the outlet of the screw feeder 14 is connected with a pressurized fluidized bed 24. The fuel inlet device 1 is arranged at the top of the primary fuel bin 5, the first gas supply pressure supplementing device 3 and the exhaust device 23 are arranged at the top of the primary fuel bin, the fuel inlet device 1 is located at the central position of the top of the primary fuel bin, the first gas supply pressure supplementing device 3 is located at the right side, the exhaust device 23 is located at the left side, the bottom of the first cylindrical discharging pipe 21 is connected with the bottom of the first cylindrical discharging pipe, the first material stirring device 6 is arranged at the top of the first discharging pipe 21, coal and biomass mixed fuel enters the primary fuel bin 5 from a circular feeding port of the fuel inlet device 1, the first gas supply pressure supplementing device 3 is used for balancing the pressure in the primary fuel bin 5 and the pressure in the secondary fuel bin 10, the gas required by the first gas supply pressure supplementing device 3 isThe valve assembly is used for discharging gas in the primary fuel bin 5, and the diameter d of the exhaust pipe is 5-10 mm; a first high-level material level sensor 2 and a first low-level material level sensor 22 which are used for measuring the material level height in the fuel bunker are installed in the primary fuel bunker 5, the first high-level material level sensor 2 and the first low-level material level sensor 22 are respectively used for measuring the upper material level height and the lower material level height of the primary fuel bunker 5, and the installation distance from the first high-level material level sensor 2 to the top of the primary fuel bunker 5 is L1The installation distance L of the first low level sensor 22 from the first material stirring device 6 is 20mm to 30mm2The first pressure sensor 4 for measuring the pressure in the fuel bin is arranged in the first-level fuel bin 5 which is 20 mm-30 mm.
The top of the secondary fuel bin 10 is connected with a first discharging pipe 21 of the primary fuel bin 5 and is provided with a second gas supply pressure supplementing device 8, the bottom of the secondary fuel bin is connected with a second discharging pipe 16, a second material stirring device 11 is arranged at the joint of the second discharging pipe 16 and the secondary fuel bin 10, the second gas supply pressure supplementing device 8 is used for balancing the pressure in the secondary fuel bin 10 and the pressure in the pressure boost fluidized bed 24, gas required by the second gas supply pressure supplementing device 8 is provided by an air supply device, a second high-level material level sensor 19 and a second low-level material level sensor 18 which are used for measuring the material level height in the fuel bin are installed in the secondary fuel bin 10, the second high-level material level sensor 19 and the second low-level material level sensor 18 are respectively used for measuring the upper material level height and the lower material level height of the secondary fuel bin 10, and the installation distance from the second high-level material3The installation distance L between the second low level material level sensor 18 and the second material stirring device 11 is 20-30 mm4The second pressure sensor 9 for measuring the pressure in the fuel bin is arranged in the secondary fuel bin 10 which is 20 mm-30 mm.
The feeding port of the screw feeder 14 is connected with the second discharging pipe 16 of the secondary fuel bin 10, the discharging port is connected with the pressurized fluidized bed 24, the feeding speed of the screw feeder 14 is controlled by a variable frequency motor, the frequency of the motor is 1-50 Hz, the inclination angle between the screw feeder 14 and the horizontal direction has influence on the productivity and the power of the screw feeder 14 in the fuel conveying process, and in order to improve the fuel conveying efficiency, the inclination angle theta between the screw feeder 14 and the horizontal direction is used for improving the fuel conveying efficiency<15 °, in this embodiment, θ is 0 ° to 3Degree. A third pressure sensor 13 for measuring the pressure therein is installed in the pressurized fluidized bed 24. The feed rate of the screw feeder 14 is calculated as:
in the formula: q is the feeding rate of the screw feeder, t/h; d, spiral diameter of the spiral feeder, m; s-screw feeder pitch, m; the screw rotating speed of the screw feeder is r/min; rho1-fuel bulk density, t/m3；
-fuel fill factor. The screw feeder size is determined based on the heat capacity of the pressurized fluidized bed 24 and related parameters, and the screw feeder feed rate is adjusted by varying the variable frequency motor frequency to vary the screw feeder speed.
As shown in fig. 1, the primary bunker 5 and the secondary bunker 10 are both composed of two parts, the upper part is designed as a cylinder, the lower part is designed as a frustum, and the inclination angle α of the frustum at the lower part of the bunker to the horizontal direction is greater than the minimum sliding angle of fuel and less than 90 ° so as to avoid fuel accumulation at the inclined part of the bunker, wherein α is selected from 50 ° to 60 °; the first-level fuel bin 5 and the second-level fuel bin 10 are connected through a first blanking pipe 21 and a second flange 20, a first electric valve 7 is mounted on the first blanking pipe 21, and the mounting position of the first electric valve 7 is located L below the first material stirring device 65The first electric valve 7 is used for controlling whether the coal and biomass mixed fuel falls into the secondary fuel bin 10 from the primary fuel bin 5 at the position of 30-50 mm; the secondary fuel bin 10 and the screw feeder 14 are connected with a first flange 17 through a second discharging pipe 16, a third electric valve 12 is installed on the second discharging pipe 16, and the installation position of the third electric valve 12 is located L below the second material stirring device 116The third electric valve 12 is used for controlling whether the coal and biomass mixed fuel falls into the screw feeder 14 from the secondary fuel bin 10 at the position of 30-50 mm; a first material stirring device 6 is arranged at the joint of the primary fuel bin 5 and the first discharging pipe 21, a second material stirring device 11 is arranged at the joint of the secondary fuel bin 10 and the second discharging pipe 16, a third material stirring device 15 is arranged at a feed inlet of the screw feeder 14, and the stirring is carried outThe material device is used for preventing coal and living beings fuel mixture from blockking up at the bunker discharge gate.
As shown in figure 1, except a material level sensor and a pressure sensor, other devices in the charging device of the pressurized fluidized bed are electrically or electromagnetically driven, corresponding signal sensors are installed, and automatic charging of the pressurized fluidized bed is realized through automatic control means such as feedback regulation and the like. The fuel inlet device 1 is controlled by signals output by the first pressure sensor 4 and the material level sensor 2, in the working process of the pressurized fluidized bed 24, when the pressure signal output by the first pressure sensor 4 is the same as the environmental pressure, the fuel inlet device 1 is opened, and when the material level sensor 2 gives an alarm, the fuel inlet device 1 is closed; the first air supply pressure supplementing device 3 is controlled by signals output by a second low-level material level sensor 18, a second pressure sensor 9, a first pressure sensor 4, a second high-level material level sensor 19 and a first low-level material level sensor 22, when the second low-level material level sensor 18 gives an alarm, a signal output by the second pressure sensor 9 is compared with a signal output by the first pressure sensor 4, when the signal output by the second pressure sensor 9 is greater than the signal output by the first pressure sensor 4, the first air supply pressure supplementing device 3 is started, and when the second high-level material level sensor 19 or the first low-level material level sensor 22 gives an alarm, the first air supply pressure supplementing device 3 is closed; the exhaust device 23 is controlled by signals output by the first air supply pressure supplementing device 3, the first electric valve 7 and the first pressure sensor 4, when the pressurized fluidized bed works and the first air supply pressure supplementing device 3 and the first electric valve 7 are both closed, the electric valve in the exhaust device 23 is opened, and when the output pressure of the first pressure sensor 4 is the same as the ambient pressure, the exhaust device 23 is closed; the second air supply pressure supplementing device 8 is controlled by signals output by the second pressure sensors 9 and 13 together, when a pressure signal output by the second pressure sensor 9 is smaller than a pressure signal output by the third pressure sensor 13, the second air supply pressure supplementing device 8 is started, air supply devices of the air supply pressure supplementing device are all blowers, the first electric valve 7 is controlled by signals output by the first pressure sensor 4, the second pressure sensor 9, the second high-level material level sensor 19 and the first low-level material level sensor 22, when a signal output by the first pressure sensor 4 is the same as a signal output by the second pressure sensor 9, namely the pressure in the primary fuel bin 5 is the same as the pressure in the secondary fuel bin 10, the first electric valve 7 is started, and when the second high-level material level sensor 19 or the first low-level material level sensor 22 gives an alarm, the first electric valve 7 is closed; the third electric valve 12 is controlled by the signal output by the screw feeder 14, and when the screw feeder 14 is opened, the third electric valve 12 is opened; the first material shifting device 6 is controlled by a signal output by the first electric valve 7, when the first electric valve 7 is opened, the first material shifting device 6 is opened, and when the first electric valve 7 is closed, the first material shifting device 6 is closed and reset; the second material shifting device 11 is controlled by a signal output by a third electric valve 12, when the third electric valve 12 is opened, the second material shifting device 11 is opened, and when the third electric valve 12 is closed, the second material shifting device 11 is closed and reset; the third material stirring device 15 is controlled by the output signal of the screw feeder 14, when the screw feeder 14 is opened, the third material stirring device 15 is opened, and when the screw feeder 14 is closed, the third material stirring device 15 is closed and reset; there is a lag time between the above steps.
As shown in fig. 2, the fuel inlet device 1 is driven by electromagnetism and is composed of an electromagnetic rail 25, a circular feed opening 26 and a circular feed opening sealing cover 27, and the fuel inlet device 1 is symmetrically distributed along the central line of the primary fuel bin 5. The circular feed opening cover 27 of the fuel inlet device 1 is slightly larger than the circular feed opening 26 to ensure complete sealing; the opening and closing of the fuel inlet device 1 are completed by the reciprocating motion of the electromagnetic drive circular feed opening sealing cover 27 on the electromagnetic track 25; when the fuel inlet device 1 is opened, the coal and biomass mixed fuel enters the primary fuel bin 5 from the circular feed opening 26, and when the fuel inlet device 1 is closed, the circular feed opening cover plate 27 moves to the circular feed opening 26 to seal the circular feed opening 26; when the circular inlet closure 27 is moved onto the circular inlet 26, the fuel inlet 1 is closed and when the circular inlet closure 27 is completely removed from the circular inlet 26, the fuel inlet 1 is opened.
As shown in fig. 3, the fuel stirring device is used for stirring the mixed fuel at the discharge port of the fuel tank to prevent the mixed fuel from being blocked at the discharge port of the fuel tank, and the fuel stirring device is composed of a cylindrical shaft 29, a stirring nail 28 and a variable frequency motor 30. The nails 28 are divided into an upper row and a lower row on the cylindrical shaft 29 and are evenly, orderly and symmetrically arranged, and the space between the adjacent nails 2Be greater than living beings granule particle diameter to avoid living beings granule to pile up on dialling the material device, two rows are dialled 28 length and are the same, but the interval is different, and when the fuel can not fully be stirred in the big nail of dialling of interval, the material can be assisted to dialling in the less nail of dialling of interval, in order to guarantee that coal and living beings blended fuel effectively fall down, dials 28 length L of nail for 15mm ~ 25mm, wherein one row of 28 interval S of dialling the nail 18 mm-12 mm, and the distance S between the other row of the nails 213 mm-17 mm; the length L of the nail 28 of the material pulling device selected in this embodiment is 20mm, and the distance S between the nails 281＝10mm、S 215 mm. The rotating speed of the cylindrical shaft 29 is controlled by a variable frequency motor 30, and the frequency of the variable frequency motor 30 is 1-50 Hz; the material stirring devices have a resetting function, the material stirring devices reset when being closed, and the falling directions of the stirring nails 28 of the material stirring devices and the coal and biomass mixed fuel are consistent when the material stirring devices reset; when the material stirring device works, the rotary stirring nail 28 can stir the coal and biomass mixed fuel to prevent the mixed fuel from being blocked at the discharge hole of the fuel bin.
Except for a material level sensor and a pressure sensor, the fuel inlet device, the gas supply pressure supplementing device, the exhaust device, the electric valve and the material stirring device are all driven by electromagnetism or electricity and provided with corresponding signal sensors, and automatic feeding of the pressurized fluidized bed is realized through automatic control means such as feedback regulation.
The feeding method comprises the following steps:
1) the feeding device stores materials in advance: when the pressurized fluidized bed 24 is not in operation or does not reach the charging temperature, the charging device needs to be stocked in advance.
(1) Firstly, closing a screw feeder 14, enabling a closing signal output by the screw feeder to close a third material stirring device 15 and a third electric valve 12, enabling a closing signal output by the third electric valve 12 to close a second material stirring device 11 and reset the second material stirring device 11, closing a first electric valve 7, enabling a closing signal output by the first electric valve to close and reset a first material stirring device 6, opening a fuel inlet device 1, enabling the coal and biomass mixed fuel to enter a primary fuel bin 5 through the fuel inlet device 1, and enabling an alarm signal output by a first high-level material level sensor 2 to stop enabling the coal and biomass mixed fuel to enter the primary fuel bin 5 from the fuel inlet device 1 when the first high-level material level sensor 2 gives an alarm;
(2) secondly, the first electric valve 7 is opened, the opening signal output by the first electric valve enables the first material stirring device 6 to be opened, the mixed fuel of coal and biomass in the primary fuel bin 5 enters the secondary fuel bin 10 from the first blanking pipe 21 through the first material stirring device 6, the alarm signal output by the second high-level material level sensor 19 or the first low-level material level sensor 22 enables the first electric valve 7 to be closed when giving an alarm, and the closing signal output by the first electric valve 7 enables the first material stirring device 6 to be closed and reset;
(3) and finally, the coal and biomass mixed fuel enters the primary fuel bin 5 through the fuel inlet device 1, when the first high-level material level sensor 2 gives an alarm, the alarm signal output by the first high-level material level sensor stops the coal and biomass mixed fuel from entering the primary fuel bin 5 from the fuel inlet device 1, the fuel inlet device 1 is closed, and the feeding device stores the fuel in advance.
2) Charging the pressurized fluidized bed during working:
(1) when the bed temperature of the pressurized fluidized bed 24 reaches the feeding temperature, the screw feeder 14 is started and the feeding speed is adjusted to a given feeding speed, the opening signal output by the screw feeder 14 enables the third material shifting device 15 to be opened, the opening signal output by the screw feeder 14 enables the third electric valve 12 to be opened, the opening signal output by the third electric valve 12 enables the second material shifting device 11 to be opened, the coal and biomass mixed fuel falls from the secondary bin 10, enters the screw feeder 14 through the second discharging pipe 16 and the third material shifting device 15 and finally enters the pressurized fluidized bed 24 through the screw feeder 14;
(2) when the pressurized fluidized bed 24 starts to be pressurized, a pressure signal sent by a third pressure sensor 13 in the pressurized fluidized bed 24 is compared with a pressure signal sent by a second pressure sensor 9 in the secondary fuel bin 10, when the pressure in the pressurized fluidized bed 24 is higher than the pressure in the secondary fuel bin 10, a signal output by the pressurized fluidized bed enables a second gas supply pressure supplementing device 8 to be started, and the second gas supply pressure supplementing device 8 enables the pressures in the secondary fuel bin 10 and the pressurized fluidized bed 24 to be balanced;
(3) when the second low level sensor 18 in the secondary fuel bin 10 gives an alarm, the alarm signal output by the second low level sensor makes the pressure signal sent by the second pressure sensor 9 in the secondary fuel bin 10 compare with the pressure signal sent by the first pressure sensor 4 in the primary fuel bin 5, when the pressure in the secondary fuel bin 10 is higher than the pressure in the primary fuel bin 5, the output signal of the pressure compensating device enables the first air supply pressure compensating device 3 to be opened, the first air supply pressure compensating device 3 enables the pressure of the secondary fuel bin 10 and the primary fuel bin 5 to reach balance, when the signal output by the first pressure sensor 4 is the same as the signal output by the second pressure sensor 9, the output signal of the first electric valve 7 enables the first electric valve 7 to be opened, the opening signal output by the first electric valve 7 enables the first material stirring device 6 to be opened, and the coal and biomass mixed fuel in the primary fuel bin 5 enters the secondary fuel bin 10 through the first material stirring device 6 and the first blanking pipe 21;
(4) when the second high level sensor 19 in the secondary fuel bin 10 or the first low level sensor 22 in the primary fuel bin 5 gives an alarm, the output signal of the second high level sensor closes the first electric valve 7 and the first air supply pressure supplementing device 3, the closing signal output by the first electric valve 7 closes and resets the first material stirring device 6, the closing signal output by the first electric valve 7 opens the electric valve in the exhaust device 23, the gas in the primary fuel bin 5 is exhausted by the exhaust pipe in the exhaust device 23, when the pressure signal output by the first pressure sensor 4 in the primary fuel bin 5 is the same as the ambient pressure, the exhaust device 23 is closed, the closing signal output by the exhaust device 23 opens the fuel inlet device 1, the mixed fuel of coal and biomass enters the primary fuel bin 5 from the fuel inlet device 1, and the level sensor 2 in the primary fuel bin 5 gives an alarm, the alarm signal output by the device stops the coal and biomass mixed fuel from entering the primary fuel bin 5 from the fuel inlet device 1 and closes the fuel inlet device 1;
(5) when the pressurized fluidized bed 24 works, the materials are circularly added according to the steps.
In the pre-storing process of the feeding device, the closing of the screw feeder, the closing and opening of an electric valve on a blanking pipe connecting the primary fuel bin and the secondary fuel bin and the closing of the fuel inlet device are manually controlled; in the working feeding process of the pressurized fluidized bed, when the screw feeder is closed, the output closing signal enables the material stirring device of the feeding hole and the electric valve connected with the secondary fuel bin and the feeding pipe of the screw feeder to be closed at the same time, and delay time is avoided; when a high-level material level sensor in the secondary fuel bin or a low-level material level sensor in the primary fuel bin gives an alarm, the output signal of the high-level material level sensor and the low-level material level sensor simultaneously closes an electric valve connected with a feeding pipe of the primary fuel bin and a feeding pipe of the secondary fuel bin and an air supply pressure compensating device on the upper part of the primary fuel bin, and no delay time exists; the lag time of 1-3 s is existed between other corresponding steps.
Claims (8)
1. The charging mode of the pressurized fluidized bed continuous automatic charging device is characterized by comprising the following steps:
1) constructing a continuous automatic feeding device of a pressurized fluidized bed: the spiral feeder is characterized by comprising a primary fuel bin, a secondary fuel bin and a spiral feeder which are sequentially connected from top to bottom, wherein an outlet of the spiral feeder is connected with a pressurized fluidized bed, a fuel inlet device is installed at the top of the primary fuel bin, material level sensors and pressure sensors are arranged inside the primary fuel bin and the secondary fuel bin, the tops of the primary fuel bin and the secondary fuel bin are connected with an air supply pressure supplementing device, material stirring devices are arranged at the tops of feeding pipes of the primary fuel bin and the secondary fuel bin, an electric valve is arranged below the material stirring devices, and a material stirring device is arranged at an inlet of;
2) the feeding device stores materials in advance:
(1) closing the screw feeder, enabling all the material stirring devices of the whole set of feeding device to be closed and reset by the closing signal output by the screw feeder, starting the fuel inlet device for feeding, and stopping feeding when a high-level material level sensor in the primary fuel bin gives an alarm;
(2) starting a material stirring device at the bottom of the primary fuel bin, enabling fuel to enter the secondary fuel bin from the primary fuel bin, and closing the material stirring device at the bottom of the primary fuel bin when a high-level material level sensor in the secondary fuel bin or a low-level material level sensor in the primary fuel bin gives an alarm;
(3) feeding the primary fuel bin, stopping feeding when a high-level material level sensor in the primary fuel bin gives an alarm, and closing a fuel inlet device;
3) charging the pressurized fluidized bed during working:
(1) starting the screw feeder, and enabling the fuel to enter the pressurized fluidized bed from the secondary fuel bin through the screw feeder;
(2) the pressurized fluidized bed starts to be pressurized, and when the pressure in the pressurized fluidized bed is higher than the pressure in the secondary fuel bin, the gas supply pressure supplementing device at the top of the secondary fuel bin is started to balance the pressure in the secondary fuel bin and the pressurized fluidized bed;
(3) a low-level material level sensor in the secondary fuel bin gives an alarm, when the pressure in the secondary fuel bin is higher than the pressure in the primary fuel bin, an air supply pressure supplementing device at the top of the primary fuel bin is started, so that the pressure in the primary fuel bin is the same as the pressure in the secondary fuel bin, a material stirring device at the bottom of the primary fuel bin is started, and fuel enters the secondary fuel bin;
(4) when a high-level material level sensor in the secondary fuel bin or a low-level material level sensor in the primary fuel bin gives an alarm, starting an exhaust device at the top of the primary fuel bin until the pressure in the primary fuel bin is the same as the ambient pressure, and then starting a fuel inlet device until the high-level material level sensor in the primary fuel bin gives an alarm, stopping feeding;
(5) when the pressurized fluidized bed works, the materials are circularly added according to the steps.
2. The charging method of the pressurized fluidized bed continuous automatic charging device according to claim 1, characterized in that the material stirring device comprises a cylindrical shaft and stirring nails, the cylindrical shaft is provided with an upper row of stirring nails and a lower row of stirring nails, the upper row of stirring nails and the lower row of stirring nails have the same length and different distances, and the end part of the cylindrical shaft is connected with a motor.
3. The charging method of a pressurized fluidized bed continuous automatic charging device according to claim 1, wherein the primary bunker and the secondary bunker are composed of an upper cylindrical structure and a lower frustum structure, and the included angle between the frustum and the horizontal direction is larger than the minimum fuel falling angle.
4. The charging mode of the pressurized fluidized bed continuous automatic charging device according to claim 1, wherein the level sensor comprises a high level sensor and a low level sensor, and the installation distance from the high level sensor to the top of the corresponding fuel bunker is 20 mm-30 mm; the installation distance between the low level sensor and the material stirring device below the low level sensor is 20-30 mm.
5. A charging method for a pressurized fluidized bed continuous automatic charging device according to claim 1, characterized in that the fuel inlet device comprises an electromagnetic rail, a charging port and a cover, and the cover can slide on the electromagnetic rail.
6. The charging method of a pressurized fluidized bed continuous automatic charging device according to claim 1, characterized in that an exhaust device is further connected to the top of the primary fuel bin.
7. The charging method of the pressurized fluidized bed continuous automatic charging device according to claim 6, wherein the fuel inlet device, the gas supply and pressure compensation device, the exhaust device, the electric valve and the material stirring device are all driven by electromagnetism or electricity and are provided with corresponding signal sensors.
8. The charging method of a pressurized fluidized bed continuous automatic charging device according to claim 1, wherein the inclination angle of the screw feeder to the horizontal direction is less than 15 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910584550.5A CN110397916B (en) | 2019-07-01 | 2019-07-01 | Continuous automatic feeding device and method for pressurized fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910584550.5A CN110397916B (en) | 2019-07-01 | 2019-07-01 | Continuous automatic feeding device and method for pressurized fluidized bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110397916A CN110397916A (en) | 2019-11-01 |
| CN110397916B true CN110397916B (en) | 2020-11-20 |
Family
ID=68323715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910584550.5A Active CN110397916B (en) | 2019-07-01 | 2019-07-01 | Continuous automatic feeding device and method for pressurized fluidized bed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110397916B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111229130A (en) * | 2020-03-25 | 2020-06-05 | 中国科学技术大学先进技术研究院 | Continuous pressurizing feeding method of biomass |
| CN112934094B (en) * | 2021-02-19 | 2021-09-03 | 山东御馨生物科技有限公司 | Full-automatic multichannel measurement powder dispersion hybrid system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201401804Y (en) * | 2009-03-31 | 2010-02-10 | 淮南市金瑞新型建筑材料厂 | Feeding bin taking rice husk as fuel |
| JP2011236337A (en) * | 2010-05-11 | 2011-11-24 | Mitsubishi Rayon Co Ltd | Thermal decomposition device and thermal decomposition method of resin |
| CN101943418A (en) * | 2010-09-29 | 2011-01-12 | 神华集团有限责任公司 | Powder storage and supplying device and powder storage and supplying controlling method of coal dust boiler |
| CN104061582B (en) * | 2014-05-22 | 2016-08-24 | 西安交通大学 | A kind of controlled trace gives powder device continuously |
| CN108679602B (en) * | 2018-05-18 | 2019-06-18 | 东南大学 | Pressurized fluidized bed Secondary Air collaboration feeding device and method |
-
2019
- 2019-07-01 CN CN201910584550.5A patent/CN110397916B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110397916A (en) | 2019-11-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110397916B (en) | Continuous automatic feeding device and method for pressurized fluidized bed | |
| CN207159157U (en) | The malleation biomass gasification device of continuous-feeding | |
| CN102425776A (en) | Steam boiler with biomass particles as fuel | |
| CN203700206U (en) | Closed full-automatic energy-saving environmental-friendly lime kiln | |
| CN203782042U (en) | Mechanical mixing small-granularity lime shaft kiln | |
| CN108679602B (en) | Pressurized fluidized bed Secondary Air collaboration feeding device and method | |
| CN204022962U (en) | The super concentrated phase transporting chute of aluminum oxide device | |
| CN201448862U (en) | Fuel feed system of ceramic kiln adopting dilute phase pneumatic conveying | |
| CN213387827U (en) | Raw material diversified active coke internal heating type rotary furnace | |
| CN215478338U (en) | Receiving tank for pneumatic conveying of fly ash guniting material | |
| CN211586631U (en) | Jar ejection of compact active carbon regenerating unit that merges | |
| CN204923434U (en) | Living beings hot -blast furnace for big -arch shelter | |
| CN203332971U (en) | Fixed-type full-automatic powder pneumatic conveying device | |
| CN208832476U (en) | It is a kind of to be pyrolyzed, burn, gasification materiel airtight conveyer and device | |
| CN217875828U (en) | Comprehensive feeding system of circulating fluidized bed boiler bed material | |
| CN207231245U (en) | Fluidized bed furnace cooling collection slag system | |
| CN208603353U (en) | A kind of Pneumatic conveyer and transportation system of material | |
| CN202792078U (en) | Auger cyclone type biomass powder combustion feeding device | |
| CN207599770U (en) | A kind of reciprocal feed arrangement of biomass material | |
| CN202808620U (en) | Energy-saving and environment-friendly lime kiln | |
| CN201713439U (en) | Large automatic shaft limekiln | |
| CN220596366U (en) | Pulverized coal conveying device of blast furnace | |
| CN213357470U (en) | Furnace body overhead type double-bin coal discharging device | |
| CN201688398U (en) | Anti-jamming sealing device used in furnace-feeding process of dense fuel with high water content under positive pressure | |
| CN201368662Y (en) | Vertical kiln |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |