CN218328119U

CN218328119U - Boiler load depth adjusting combustion device of thermal power plant

Info

Publication number: CN218328119U
Application number: CN202222169724.1U
Authority: CN
Inventors: 黄才保; 黄宇鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2023-01-17
Anticipated expiration: 2032-08-18

Abstract

The utility model discloses a burner is adjusted to thermal power plant boiler load degree of depth, including the main combustion chamber of boiler, the main combustion chamber of boiler openly distributes one or more components of a whole that can function independently combustion chamber with both sides, the independent combustion chamber of components of a whole that can function independently is separated by firebrick material, and one or more pulverized coal burner is installed to its outside, pulverized coal burner warp tube way links to each other with the balanced distributor of buggy, the balanced distributor of buggy warp way links to each other with the conveyer, the conveyer warp way links to each other with the batcher, the governing valve link to each other with flow instrument link to each other with the check valve links to each other with the conveyer. Through the transformation of the combustion chamber and the change of the combustion mode, the pulverized coal is more fully and completely combusted, the heat efficiency of the boiler and the utilization rate of the pulverized coal heat energy are effectively improved, and the purposes of environmental protection and energy conservation are achieved.

Description

Boiler load degree of depth of thermal power plant adjusts burner

Technical Field

The utility model relates to a boiler of thermal power plant burns relevant technical field, concretely relates to boiler of thermal power plant load degree of depth adjusts burner.

Background

At present, a pulverized coal combustion boiler is generally adopted in a thermal power plant, and the pulverized coal is directly sent into a boiler combustion chamber to be combusted by adopting a screw fan to generate heat, and the heat is absorbed by the boiler and converted into high-temperature high-pressure steam which is converted into electric energy by a turbine generator. Because the conveying mode is simple and extensive, the flow cannot be accurately controlled, the concentration of the pulverized coal is low, and a large amount of cold air enters the kiln to absorb a large amount of heat, the combustion of the pulverized coal is unstable; meanwhile, as a large amount of air is brought in by the pulverized coal conveying system, only a small amount of air enters the combustion chamber after being preheated by the boiler, the air-coal ratio control and adjustment difficulty is high, the operation difficulty is increased, and the accurate temperature control is not facilitated; the boiler combustion chamber has the advantages of simple structure, large space, large coal powder combustion amount in unit time, unstable combustion and easy flameout when the coal powder is in low flow, unbalanced temperature of a heating surface of the boiler, serious influence on the operation safety of the boiler, and capability of ensuring the operation by adding fuel oil when necessary, namely the boiler cannot realize low-load operation, the load adjusting range of the boiler is narrow, deep adjustment cannot be achieved, and the purpose of deep peak regulation of a thermal power plant cannot be met. The boiler main combustion chamber is big, and the oil mass is big during the ignition, and is long, and is with high costs, causes the boiler in case put into operation, opens and stops the difficulty, seriously restricts the operation regulation of boiler. Meanwhile, the combustion mode is incomplete in pulverized coal combustion, and the thermal efficiency and the pulverized coal utilization rate of the boiler are not high.

With the development of new energy in China, the rise of new energy power plants such as hydroelectric power generation, solar photovoltaic power generation, wind power generation, biomass power plants, garbage power plants, factory waste heat power generation and the like, the power supply market is changed greatly. The method is especially necessary for guaranteeing safe and stable operation of a power grid, improving the flexibility of a thermal generator set and improving the deep peak regulation capacity. According to the current situation of analyzing domestic and foreign states, the thermal power generating units are influenced by coal quality, equipment and the like of the thermal power generating units, the peak regulation capacity of the thermal power generating units in China under pure condensation conditions is generally only 40-50%, the peak regulation capacity under heat supply conditions is even as low as about 30%, and the difference between the peak regulation capacity and the peak regulation capacity of the thermal power generating units in Germany, denmark and other European countries is larger than 70%. When the power load of the power grid is reduced, the power supply load of the thermal power plant is reduced, a large amount of redundant heat cannot be directly converted into electric energy, and waste is large.

The existing coal-electric machine set must have better flexible performance indexes, namely stronger deep peak regulation capability, quicker climbing capability and start-stop capability, so as to meet the requirement of adjusting the power load of a system at any time.

The utility model discloses the device can reform transform under not changing original buggy conveying system equipment state, increases one set of new buggy conveying system alone operation or switches the operation, also can combine original buggy conveying system to reform transform, constitutes buggy conveying system jointly, moves simultaneously, carries out automatically regulated when the peak regulation demand according to the boiler and supplies the powder volume. The structure of the boiler combustion chamber needs to be properly modified so as to achieve the purpose of combustion optimization control. Through the transformation of the combustion chamber and the change of the combustion mode, the pulverized coal is more fully and completely combusted, the heat efficiency of the boiler and the utilization rate of the pulverized coal heat energy are effectively improved, and the purposes of environmental protection and energy conservation are achieved.

The whole system is operated in a totally-enclosed way, and the mixed gas of the externally discharged coal and gas is filtered and evacuated by adopting a bag type dust collector, so that the safety and the environmental protection of the system are ensured.

SUMMERY OF THE UTILITY MODEL

In order to achieve the above purpose, the utility model adopts the following technical means:

a thermal power plant boiler load depth adjusting combustion device comprises a boiler main combustion chamber, wherein one or more split independent combustion chambers are distributed on the front surface and two sides of the boiler main combustion chamber, the split independent combustion chambers are separated by refractory bricks, one or more pulverized coal burners are installed on the outer sides of the split independent combustion chambers, the pulverized coal burners are connected with a pulverized coal balanced distributor through pipelines, the pulverized coal balanced distributor is connected with a conveyor through a pipeline, the conveyor is connected with a feeding machine through a pipeline, an adjusting valve is connected with a flow meter, the flow meter is connected with a one-way valve, and the one-way valve is connected with the conveyor; the powder feeding device comprises a feeding machine, a valve, a check valve, a flow meter, a weighing sensor, a pressure sensor, a powder storage bin, a dust remover, a powder storage bin, a dust collector, a powder storage bin, a powder delivery device and a filter.

Preferably, the separate independent combustion chamber is wholly or partially embedded into the main combustion chamber of the boiler spatially.

Preferably, the conveyor consists of a venturi ejector.

Preferably, the pulverized coal burner consists of a pulverized coal channel, a compressed air channel, an air cap, a nozzle and a pipe joint, wherein one end of the pulverized coal channel is connected with the pipe joint, the other end of the pulverized coal channel is connected with the nozzle, and the pipe joint is connected with an external pulverized coal pipeline; one end of the compressed air channel is connected with a pipe joint, the other end of the compressed air channel is connected with an air cap, and the pipe joint of the compressed air channel is connected with an external compressed air pipeline; the nozzle is a communicating body consisting of a nozzle inner cavity, an air groove, an air tunnel and the like, the outer surface of the nozzle is in a cylindrical or conical structure, the air grooves are spirally distributed on the outer surface of the nozzle, the air tunnel inclined to the nozzle inner cavity is arranged in the air groove, the air tunnel is connected with the nozzle inner cavity, and openings at two ends of the nozzle are communicated with the outside; the inner cavity of the hood is provided with a nozzle and is connected with the inner cavity of the nozzle through an air groove and an air tunnel of the nozzle.

Preferably, the gasification device comprises a filter screen and a pipe joint, the gasification device is made of a metal steel pipe, one end of the gasification device is sealed by the filter screen, and the filter screen is a stainless steel sintering screen, a plurality of layers of stainless steel filter screens and other filter screens; the pipe joint is connected with an external pipeline.

Preferably, the coal powder uniform distributor comprises a spherical surface and pipe joints, the coal powder uniform distributor is a spherical cone, the pipe joints are arranged at two ends of the coal powder uniform distributor, and the coal powder uniform distributor is used for uniformly distributing coal powder entering from one end to one or more conveying pipelines at the other end.

Preferably, the pipe joints are distributed on the spherical surface in a concentric circle mode; one end pipe joint is connected with a coal powder conveying pipeline, and the other end pipe joint outputs coal powder to each coal powder burner.

The sending tank comprises a bottom fluidization instrument panel, a waist fluidization instrument panel, a weighing instrument panel and a pipe joint, and the sending tank body is made of metal steel and is in a cone shape; the bottom of the sending tank is provided with bottom fluidization, the bottom fluidization is made of a stainless steel sintering net, and a fluidization chamber is connected with a pipe joint; the waist part of the sending tank is provided with waist fluidization, the waist fluidization surrounds the sending tank for a circle, and the uniform steel pipe is connected with the sending tank; a weighing instrument board is arranged at the top of the sending tank and used for installing a weighing sensor; the sending tank accurately measures and stabilizes the concentration of the pulverized coal under the control of a computer, and sends the pulverized coal to the combustor to enter the combustion chamber for combustion according to set pressure and flow.

The utility model has the advantages that:

the device has the characteristics of accurate control of pulverized coal flow, full-automatic operation, low failure rate, environmental protection, no dust, stable operation and the like. The pulverized coal conveying device has the advantages of uniform powder conveying, no pipe blockage, stable combustion and capability of accurately measuring the flow of conveyed pulverized coal. The system occupies small area and the conveying pipeline is simple. Because the granularity of the coal powder is very small, the coal powder can easily reach an atomizing state after being mixed with atomizing gas, the requirement on the atomizing gas is not very high, and only a certain amount of the coal powder is required to be ensured. The adopted pulverized coal burner has simple structure, continuous, uniform and stable pulverized coal quantity, difficult blockage, and detachable inner and outer rods, and is convenient to clean.

The device adopts concentrated phase conveying, the concentration of the pulverized coal is high, a weighing instrument is arranged in the device, the flow of the pulverized coal can be instantly monitored through the accurate calculation of a computer, the using amount of the pulverized coal can be accurately controlled, and the problem that the combustion flow of the pulverized coal is not controlled is well solved; the dense phase conveying adopts compressed air as power, and the air quantity for combustion can be completely or mostly preheated by the waste heat of the boiler, so that the adjustment and control of the combustion working condition of the pulverized coal are facilitated, and the problem that a large amount of cold air enters a combustion chamber to influence the combustion working condition is solved;

the front and two sides of the combustion chamber are provided with one or more independent split combustion chambers which are communicated with the main combustion chamber of the boiler, so that the integral combustion during heat transfer and heavy load is facilitated. The design of the split independent combustion chambers sets the combustion chambers in a partitioned manner, so that the combustion space is formed by a plurality of independent combustion spaces divided into a whole, the plurality of split independent combustion chambers can run simultaneously or partially, and the adjustment of the combustion load of the boiler can be realized by adjusting the quantity of the split independent combustion chambers and the pulverized coal consumption of each split independent combustion chamber, so that the overall combustion performance is ensured, the boiler load can be flexibly adjusted, the operation condition of the boiler is stable, and the requirement of stable operation of the boiler in the low pulverized coal quantity is met. The working quantity and the burner quantity of the combustion chambers can be adjusted according to the requirement of the boiler load during the working of the system device, the system device is convenient to switch, and the amplitude of flexibly adjusting the boiler load is achieved.

The technology of accurately controlling pulverized coal conveying and the split independent combustion chamber, which is possessed by the device, is combined with each other, so that the adjustment range of the operation load of the boiler is enlarged, the flameout phenomenon can not occur during the low-load operation, the flexibility of adjusting the load size is greatly increased, the energy waste is greatly reduced, the energy is saved, the environmental protection is realized, and the purpose of deep peak regulation can be achieved.

The device has the following advantages:

1. the pulverized coal conveying capacity is uniform, the combustion is stable, the temperature is balanced, and the load stability is high;

2. under the working condition of low coal powder combustion operation, fuel oil supplement is not required to be input, so that the cost is greatly saved;

3. the system has the advantages of dispersed ignition, high speed, less oil input, great ignition cost saving, convenient start and stop of the boiler and great enhancement of the power generation peak regulation capability;

4. the equipment works to realize full-automatic control, the operation is stable, the operation is easy, and the labor intensity is low;

5. the combustion condition is stable, the boiler is heated evenly, and the problem of local over-high temperature can not appear.

Drawings

Fig. 1 is a schematic view of the whole structure of the thermal power plant boiler load depth adjusting combustion apparatus of the present invention;

FIG. 2 is a schematic view of the structure of the independent combustion chamber of the present invention;

FIG. 3 is a schematic structural diagram of the pulverized coal equalizing distributor according to the present invention;

FIG. 4 is a schematic structural view of a gasification apparatus according to the present invention;

FIG. 5 is a schematic view of the pulverized coal burner of the present invention;

fig. 6 is a schematic structural view of the sending tank of the present invention;

fig. 7 is a schematic structural view of the nozzle of the pulverized coal burner of the present invention.

Wherein:

1-boiler main combustion chamber, 2-split independent combustion chamber, 3-pulverized coal burner, 4-pulverized coal equilibrium distributor, 5-gasification device, 6-dust remover, 7-powder storage bin, 8-valve, 9-sending tank, 10-conveyor, 11-filter, 12-pipeline, 13-weighing sensor, 14-pressure sensor, 15-feeder, 16-one-way valve, 17-electromagnetic valve, 18-regulating valve, 19-flow instrument, 20-filter screen, 22-pipe joint, 23-sphere, 24-compressed air channel, 25-pulverized coal channel, 26-blast cap, 27-nozzle, 28-air groove, 29-air hole, 30-nozzle inner cavity, 31-waist fluidization, 32-bottom fluidization and 33-weighing instrument panel.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

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, it need not be further defined or explained in subsequent figures.

In the embodiments provided in the present application, it should be understood that the disclosed system may also be implemented in other manners. The system embodiments are merely illustrative, and for example, the block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and computer program products according to various embodiments of the present application. In this regard, each block in the block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device, which may be a personal computer, a server, or a network device, to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Description of the working principle: as shown in fig. 1, a thermal power plant boiler load depth adjusting combustion apparatus comprises a main boiler combustion chamber 1, wherein one or more split independent combustion chambers 2 are distributed on the front surface and two sides of the main boiler combustion chamber 1, the split independent combustion chambers 2 are separated by refractory bricks, one or more pulverized coal burners 3 are installed on the outer sides of the split independent combustion chambers, the pulverized coal burners 3 are connected with a pulverized coal equilibrium distributor 4 through a pipeline 12, the pulverized coal equilibrium distributor 4 is connected with a conveyor 10 through a pipeline 12, the conveyor 10 is connected with a feeder 15 through a pipeline 12, an adjusting valve 18 is connected with a flow meter 19, the flow meter 19 is connected with a one-way valve 16, and the one-way valve 16 is connected with the conveyor 10; the powder feeding machine 15 is connected with the valve 8, the one-way valve 16 is connected with an electromagnetic valve, the one-way valve 16 is connected with the powder feeding machine 15 and the conveyor 10 through a pipeline, the powder feeding machine 15 is connected with the sending tank 9 through the valve 8, the sending tank 9 is connected with the one-way valve 16 through the pipeline 12, the one-way valve 16 is connected with the flow meter 19, the flow meter 19 is connected with the regulating valve 18, the sending tank 9 is connected with the weighing sensor 13 and the pressure sensor 14, the sending tank 9 is connected with the bottom of the powder storage bin 7 through the pipeline, the valve 8 and the pipeline 12, the sending tank 9 is connected with the top of the powder storage bin 7 through the pipeline 12, the valve 8 and the pipeline 12, the upper portion of the powder storage bin 7 is connected with the weighing sensor 13, the lower portion of the powder storage bin 7 is connected with the gasification device 5, the top of the powder storage bin 7 is connected with the dust remover 6, and the powder storage bin 7 is connected with the filter 11 through the pipeline. The conveyor 10 consists of a venturi ejector.

As shown in fig. 2-7, wherein the separate independent combustion chamber 2 is spatially embedded in the main combustion chamber 1 of the boiler, either completely or partially. The inner side of the main combustion chamber is properly closed and communicated with the main combustion chamber 1, the rest periphery of the main combustion chamber is sealed by adopting a wall body, the combustion flame and temperature of the main combustion chamber are transmitted to enter the main combustion chamber 1, the unburned coal powder enters the main combustion chamber 1 to be continuously combusted, and the smoke generated by combustion enters a flue through the main combustion chamber 1; the split independent combustion chamber 2 is an independent combustion space and is used for finishing the combustion of the small-flow pulverized coal, and because the space is small, the heat effect is high, the temperature is concentrated, the heat dissipation is small, the combustion of the small-flow pulverized coal is stable, and the split independent combustion chamber is provided with a special conveying device and a special pulverized coal burner, the combustion stability is greatly improved, and the combustion heat regulation range is wide. The combustion of one main combustion chamber 1 is completed by combining a plurality of split independent combustion chambers 2, and the combustion heat of the main combustion chamber 1 can be adjusted by adjusting the combustion heat of the split independent combustion, so that the load of the boiler can be flexibly and deeply adjusted, and the thermal efficiency of the boiler is greatly improved and utilized.

The pulverized coal burner 3 consists of a pulverized coal channel 25, a compressed air channel 24, an air cap 26, a nozzle 27 and a pipe joint 22, one end of the pulverized coal channel 25 is connected with the pipe joint 22, the other end of the pulverized coal channel is connected with the nozzle 27, and the pipe joint 22 is connected with an external pulverized coal pipeline 12; the compressed air channel 24 is connected with the pipe joint 22 at one end and the blast cap 26 at the other end, and the pipe joint 22 is connected with an external compressed air pipeline.

The pulverized coal burner 3 comprises a pulverized coal channel 25, a compressed air channel 24, an air cap 26, a nozzle 27, a pipe joint 22 and the like; one end of the coal powder channel is connected with a pipe joint 22, the other end of the coal powder channel is connected with a nozzle 27, and the pipe joint is connected with an external coal powder pipeline; one end of the compressed air channel 24 is connected with the pipe joint 22, the other end of the compressed air channel is connected with the blast cap 26, and the pipe joint 22 is connected with an external compressed air pipeline; the inner cavity of the blast cap 26 is provided with a nozzle 27 which is connected with the nozzle inner cavity 30 through a nozzle air groove and an air tunnel; the outer surface of the nozzle 27 is in a cylindrical and conical structure, the outer surface is spirally distributed with air grooves, the air grooves are internally provided with air tunnels with inclined nozzle inner cavities, the air tunnels 29 are connected with the nozzle inner cavities 30, and openings at two ends of the nozzle 27 are communicated with the outside, so that the structure is favorable for fully mixing the air and the coal powder to meet the requirements of working conditions;

the pulverized coal burner 3 is actually a pulverized coal air-entrapping mixing atomization device, so that pulverized coal is fully mixed with air and enters a split independent combustion chamber for full combustion, and meanwhile, the flame length and the rigidity can be adjusted by adjusting the air pressure of the pulverized coal burner, so that the combustion working condition reaches the optimal state.

The nozzle 27 is a communicating body composed of a nozzle inner cavity 30, air grooves 28, air tunnels 29 and the like, the outer surface of the nozzle 27 is of a cylindrical or conical structure, the air grooves are spirally distributed on the outer surface of the nozzle 27, the air tunnels inclined to the nozzle inner cavity are arranged in the air grooves 28, the air tunnels are connected with the nozzle inner cavity, and openings at two ends of the nozzle 27 are communicated with the outside; the inner cavity of the blast cap 26 is provided with a nozzle 27 and is connected with a nozzle inner cavity 30 through a wind groove 28 and a wind tunnel 29 of the nozzle 27.

The gasification device 5 comprises a filter screen 20 and a pipe joint 22, the gasification device 5 is made of a metal steel pipe, one end of the gasification device is sealed by the filter screen, and the pipe joint 22 is connected with an external pipeline. The filter screen 20 is a stainless steel sintered screen, a multi-layer stainless steel filter screen and other filter screens; the pipe joint is connected with an external pipeline.

The coal powder equilibrium distributor 4 comprises a spherical surface 23 and a pipe joint 22, the coal powder equilibrium distributor 4 is a spherical cone, and the pipe joint 22 is arranged at two ends.

The spherical surface 23 is provided with pipe joints 22 in a concentric circle mode, one end of each pipe joint is connected with a coal powder conveying pipeline, and the other end of each pipe joint outputs coal powder to each coal powder burner 3.

The sending tank 9 comprises a bottom fluidization device 32, a waist fluidization device 31, a weighing instrument panel 33 and a pipe joint 22; the sending tank 9 body is made of metal steel and is in a cone shape; the bottom of the sending tank 9 is provided with a bottom fluidization chamber 32, the bottom fluidization chamber 32 is made of a stainless steel sintering net, and the fluidization chamber is connected with the pipe joint 22; the waist part of the sending tank 9 is provided with a waist part fluidization 31, the waist part fluidization 31 surrounds the sending tank for a circle, and the uniform steel pipe is connected with the sending tank 9; a weighing instrument panel 33 is arranged at the top of the sending tank and used for mounting a weighing sensor; the sending tank accurately measures and stabilizes the concentration of the pulverized coal under the control of a computer, and sends the pulverized coal to a combustor to enter a combustion chamber for combustion according to set pressure and flow.

The positive pressure concentrated phase is adopted to convey the coal powder, so that the coal powder is stably conveyed, the whole device adopts a Distributed Computer (DCS) or a program controller (PLC) to control and calculate, the automatic work and adjustment of the system are realized, the coal powder conveying amount can be accurately metered and controlled, and the coal powder combustion amount of a boiler is controlled and adjusted; the design of the split independent combustion chambers is combined, an original combustion chamber is divided into a plurality of split independent combustion chambers, the number of the split independent combustion chambers and the number of the pulverized coal burners can be adjusted according to the heat value requirement of the boiler, the pulverized coal consumption is set, and the heat of the boiler can be controlled; moreover, the split independent combustion chamber technology can flexibly select and adjust the split independent combustion chambers, so that the space temperature in the main combustion chamber is uniform and balanced, the boiler is uniformly heated and is not influenced, the boiler is stable in water power in long-term low-load operation, and the overheating of each heating surface is avoided, so that the stability of each working condition of the boiler is ensured, the fuel oil supplement is not required to be added under the working condition of low-pulverized coal operation, and the cost is greatly saved.

The load of the boiler is flexibly controlled and adjusted, the steam quantity generated by the boiler can be flexibly adjusted, the generated energy of the steam turbine generator unit is adjusted, and the purpose of deep peak regulation is achieved. Because the dense phase conveying is adopted, the air-coal ratio adjusting range is wide, the special burner is used for burning, meanwhile, the original boiler combustion chamber is large in space, the coal dust required by stable burning is large, heat dissipation is fast, the stable burning of low coal amount is not facilitated, the original combustion chamber is divided into a plurality of combustion chambers by adopting the split independent combustion chambers, so that the stable burning can be kept when the coal dust amount is low, the temperature is stable, and the problems that the original coal dust cannot be burnt at low flow rate and is easy to extinguish are well solved. The split independent combustion chambers are arranged, and one combustion chamber can be independently ignited step by step when the boiler is ignited, so that the ignition speed is high, the oil injection is less, the ignition cost is greatly saved, the boiler is convenient to start and stop, and the power generation peak regulation capacity is greatly enhanced. Because the dense phase conveying is adopted, the air quantity brought by the coal powder is less, and most of the air quantity can enter the combustion chamber after being preheated by the boiler, so that the control of the combustion working condition is facilitated, the burning-out rate of the coal powder is greatly improved, and the environmental protection and the energy saving are facilitated.

Claims

1. The utility model provides a boiler load degree of depth adjustment burner of thermal power plant, includes boiler main combustion chamber (1), its characterized in that, boiler main combustion chamber (1) front and both sides distribute one or more components of a whole that can function independently combustion chamber (2), components of a whole that can function independently combustion chamber (2) are separated by refractory brick material, can realize the subregion burning from the space, and its outside installs one or more pulverized coal burner (3), pulverized coal burner (3) link to each other with pulverized coal equilibrium distributor (4) through pipeline (12), pulverized coal equilibrium distributor (4) link to each other with conveyer (10) through pipeline (12), conveyer (10) link to each other with batcher (15) through pipeline (12), governing valve (18) link to each other with flow instrument (19), flow instrument (19) link to each other with check valve (16), check valve (16) link to each other with conveyer (10); the powder feeding device is characterized in that the feeding machine (15) is connected with a valve (8), the one-way valve (16) is connected with an electromagnetic valve (17), the one-way valve (16) is connected with the feeding machine (15) and the conveyor (10) through a pipeline, the feeding machine (15) is connected with the sending tank (9) through the valve (8), the sending tank (9) is connected with the one-way valve (16) through a pipeline (12), the one-way valve (16) is connected with a flow instrument (19), the flow instrument (19) is connected with an adjusting valve (18), the sending tank (9) is connected with a weighing sensor (13) and a pressure sensor (14), the sending tank (9) is connected with the bottom of the powder storage bin (7) through a pipeline, the valve (8) and the pipeline (12), the sending tank (9) is connected with the top of the powder storage bin (7) through the pipeline (12), the upper portion of the powder storage bin (7) is connected with the weighing sensor (13), the lower portion of the powder storage bin (7) is connected with the gasification device (5), the top of the powder storage bin (7) is connected with a dust collector (6), and the dust collector (11) is connected with the powder storage bin (11).

2. The boiler load depth adjusting combustion device of the thermal power plant as claimed in claim 1, characterized in that the separate independent combustion chamber (2) is spatially embedded in the main combustion chamber (1) of the boiler wholly or partially.

3. A thermal power plant boiler load depth modulated firing device as claimed in claim 1, characterized in that the conveyor (10) consists of a venturi ejector.

4. The thermal power plant boiler load depth adjusting combustion device according to claim 1, characterized in that the pulverized coal burner (3) is composed of a pulverized coal channel (25), a compressed air channel (24), an air cap (26), a nozzle (27) and a pipe joint (22), one end of the pulverized coal channel (25) is connected with the pipe joint (22), the other end is connected with the nozzle (27), and the pipe joint (22) is connected with an external pulverized coal pipeline (12); one end of the compressed air channel (24) is connected with the pipe joint (22), the other end of the compressed air channel is connected with the blast cap (26), and the pipe joint (22) is connected with an external compressed air pipeline; the nozzle (27) consists of a nozzle inner cavity (30), air grooves (28) and air tunnels (29) to form a communicating body, the outer surface of the nozzle (27) is of a cylindrical or conical structure, the air grooves are spirally distributed on the outer surface of the nozzle (27), the air tunnels inclined to the nozzle inner cavity are arranged in the air grooves (28), the air tunnels are connected with the nozzle inner cavity, and openings at two ends of the nozzle (27) are communicated with the outside; the inner cavity of the blast cap (26) is provided with a nozzle (27) and is connected with the inner cavity (30) of the nozzle through an air groove (28) and an air tunnel (29) of the nozzle (27).

5. The boiler load depth adjusting combustion device of the thermal power plant as claimed in claim 1, characterized in that the gasification device (5) comprises a filter screen (20) and a pipe joint (22), the gasification device (5) is made of a metal steel pipe, one end of the gasification device is sealed by the filter screen, and the pipe joint (22) is connected with an external pipeline.

6. The boiler load depth adjusting combustion device of the thermal power plant as claimed in claim 1, characterized in that the pulverized coal uniform distributor (4) comprises a spherical surface (23) and a pipe joint (22), the pulverized coal uniform distributor (4) is a spherical cone, and the pipe joint (22) is installed at two ends.

7. The thermal power plant boiler load depth adjusting combustion device as defined in claim 6, characterized in that the spherical surface (23) is provided with pipe joints (22) in concentric circles, one end of each pipe joint is connected with a pulverized coal conveying pipeline, and the other end of each pipe joint outputs pulverized coal to each pulverized coal burner (3).

8. A boiler load depth regulating burner apparatus as claimed in claim 1, characterized in that said delivery tank (9) comprises a bottom fluidization (32), a waist fluidization (31), a weighing panel (33) and a pipe connection (22); the sending tank (9) body is made of metal steel and is in a cone shape; the bottom of the sending tank (9) is provided with bottom fluidization (32), the bottom fluidization (32) is made of a stainless steel sintering net, and a fluidization chamber is connected with a pipe joint (22); waist fluidization (31) is arranged at the waist of the sending tank (9), the waist fluidization (31) surrounds the sending tank for a circle, and the uniform steel pipe is connected with the sending tank (9); and a weighing instrument panel (33) is arranged at the top of the sending tank.