CN210568372U

CN210568372U - Boiler system

Info

Publication number: CN210568372U
Application number: CN201921348072.XU
Authority: CN
Inventors: 宋林波; 龚泽儒; 王晓娜; 杨金杰; 邹鹏; 李冬; 朱新龙; 郑艳丽; 张一坤
Original assignee: Yantai Longyuan Power Technology Co Ltd
Current assignee: Yantai Longyuan Power Technology Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-05-19
Anticipated expiration: 2029-08-20

Abstract

The utility model relates to a boiler technical field, in particular to boiler system. The utility model provides a boiler system, including the first boiler that has first time tuber pipe, have the second boiler of the tuber pipe of second once and buggy conveyor between the stove, buggy conveyor connects first time tuber pipe and the tuber pipe of second once between the stove to carry the buggy in the tuber pipe of second once to first one in the tuber pipe. Based on this, the application limit of the higher coal feeding power of the coal pulverizing system to the oil-saving ignition technology in the initial starting stage of the boiler can be reduced.

Description

Boiler system

Technical Field

The utility model relates to a boiler technical field, in particular to boiler system.

Background

The oil-saving ignition technology is an important technology in the boiler, and coal is used for replacing fuel oil to provide heat in the stages of starting and stopping the boiler, stabilizing the low load of the boiler and the like so as to achieve the aim of saving oil.

In the initial stage of boiler start-up, in order to protect the heating surface of the boiler and control the temperature rise and pressure rise rate in the boiler, the heat load in the initial stage of start-up needs to be limited. Due to the limitation of a boiler coal pulverizing system (especially a direct-fired coal pulverizing system), the minimum output of a coal feeder and a coal pulverizer is limited, and the temperature and pressure rise is too fast due to the fact that the initial fuel input is too high and the thermal load is too large.

In view of the above situation, some countermeasures are currently adopted: partial power plants select a frequency converter mode for improving a coal mill, so that the minimum output of a coal pulverizing system is reduced, but the method has the defects of limited effect and high investment; in addition, some power plants select to use an oil gun to supply heat at the initial starting stage, and then put into an oil-saving ignition technology after the temperature and the pressure of a boiler reach certain levels, but the popularization and the application of the oil-saving ignition technology are influenced.

Therefore, in the prior art, the application of the oil-saving ignition technology in the initial starting stage of the boiler is still limited due to the fact that the initial fuel injection amount of the powder preparation system is overlarge.

Disclosure of Invention

The utility model discloses a technical problem that will solve is: the application limit of the higher coal feeding power of the coal pulverizing system to the oil-saving ignition technology at the initial starting stage of the boiler is reduced.

In order to solve the technical problem, the utility model provides a boiler system, a serial communication port, include:

the first boiler comprises a first primary air pipe;

the second boiler comprises a second primary air pipe; and

and the furnace coal powder conveying device is connected with the first primary air pipe and the second primary air pipe and conveys the coal powder in the second primary air pipe to the first primary air pipe.

In some embodiments, the inter-furnace pulverized coal conveying device comprises an inter-furnace connecting pipe, and the inter-furnace connecting pipe is connected with the first primary air pipe and the second primary air pipe.

In some embodiments, the inter-furnace pulverized coal conveying device further comprises an inter-furnace pulverized coal taking device, and the inter-furnace pulverized coal taking device is communicated with the second primary air pipe and the inter-furnace connecting pipe; and/or the inter-furnace pulverized coal conveying device further comprises a pulverized coal mixing device, and the pulverized coal mixing device is communicated with the inter-furnace connecting pipe and the first primary air pipe.

In some embodiments, the inter-furnace pulverized coal conveying device further comprises a first control valve, and the first control valve is arranged on the inter-furnace connecting pipe and used for controlling the on-off of the inter-furnace connecting pipe.

In some embodiments, the inter-furnace pulverized coal conveying device further comprises a power device, and the power device drives pulverized coal in the second primary air pipe to flow to the first primary air pipe through the inter-furnace connecting pipe.

In some embodiments, the power plant also regulates the flow of pulverized coal from the second primary air duct to the first primary air duct.

In some embodiments, the power plant includes a compressed air jet mechanism.

In some embodiments, the power device is connected with the connecting pipe between the furnaces, or the power device is connected with the powder taking device between the furnaces.

In some embodiments, the inter-furnace pulverized coal conveying device further comprises a second control valve, and the second control valve is arranged on a connecting pipeline between the power device and the inter-furnace connecting pipe or the inter-furnace pulverized coal taking device and used for controlling the connection and disconnection of the connecting pipeline between the power device and the inter-furnace connecting pipe or the inter-furnace pulverized coal taking device.

In some embodiments, the boiler system further comprises a first coal mill and a second coal mill, the first coal mill provides pulverized coal for the first boiler, the second coal mill provides pulverized coal for the second boiler, and the first primary air duct is connected with an outlet of the first coal mill, and the second primary air duct is connected with an outlet of the second coal mill.

The utility model discloses in, during buggy conveyor can carry the first time tuber pipe of first boiler with the buggy by the second tuber pipe of second boiler, for first boiler provides the required ignition buggy of suitable concentration of start-up initial stage for first boiler need not to rely on the buggy that the powder process system provided again at the start-up initial stage, thereby can reduce the higher coal-feeding power of powder process system and start the application restriction of initial stage to the technique of economizing on fuel at the boiler.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 shows a schematic structural diagram of a pulverized coal conveying device in an embodiment of the present invention.

Fig. 2 shows a schematic diagram of a pulverized coal conveying device in another embodiment of the present invention.

In the figure:

1. a first primary air duct; 2. a second primary air duct;

31. a powder taking device in the furnace chamber; 32. a furnace chamber connecting pipe; 33. a pulverized coal mixing device; 34. a power plant; 35. a first control valve; 36. a second control valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by the ordinary skilled person in the art without developing the creative work belong to the protection scope of the present invention.

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 the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, 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 simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted 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.

In the description of the present invention, it should be understood that the terms "first", "second", etc. are used to define the components, and are only used for the convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, should not be interpreted as limiting the scope of the present invention.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Because the powder process system has the minimum output limit, in the initial stage of boiler start, even if the powder process system works with the minimum power, the amount of the put pulverized coal is still more than that required in the initial stage of boiler start, the temperature and pressure of the boiler are easily increased too fast, the heat load in the initial stage of boiler start is too high, and under the condition, the oil-saving ignition technology is difficult to implement. Therefore, how to realize the application of the oil-saving ignition technology in the initial stage of boiler ignition on the premise of not changing a pulverizing system is a difficult problem.

In order to solve the technical problem, the inter-furnace pulverized coal conveying device is additionally arranged between the two boilers.

Fig. 1-2 show two embodiments of the present invention. Referring to fig. 1-2, the present invention provides a boiler system, comprising:

the first boiler comprises a first primary air pipe 1;

the second boiler comprises a second primary air pipe 2; and

the device for conveying the pulverized coal between the furnaces is connected with the first primary air pipe 1 and the second primary air pipe 2 and conveys the pulverized coal in the second primary air pipe 2 to the first primary air pipe 1.

Based on buggy conveyor between stove that sets up, the utility model discloses can carry the buggy in the second air pipe 2 of second boiler in the first air 1 pipe of first boiler, as the ignition buggy at first boiler start-up initial stage, because this makes first boiler need not to rely on the buggy that the powder process system provided again at the initial stage of igniting, consequently, can effectively solve the problem that the interior intensification that leads to because of the powder process system coal-feeding power is great steps up too fast, this is favorable to realizing the application of the ignition technique that economizes on fuel at the boiler start-up initial stage.

And, the utility model discloses need not to reform transform the equipment among the coal pulverizing systems such as coal pulverizer or feeder, can solve the too fast problem that steps up because of the too big stove intensification that leads to of coal pulverizing system coal injection power, consequently, improve the cost lower.

And simultaneously, the utility model discloses in 1 pipe of the first air of first boiler is transported by the second tuber pipe 2 of second boiler with the buggy, and not from the second buggy storehouse of second boiler to the first buggy storehouse of first boiler, also not from the second buggy storehouse of second boiler to the first combustor of first boiler, consequently, do not receive the restriction in buggy storehouse, all kinds of powder process systems such as well storage formula powder process system and direct-blow formula powder process system all are suitable for, and application scope is wider.

The utility model discloses in, first boiler and second boiler can be for two adjacent boilers each other to shorten the buggy conveyor's between the stove buggy transport route, thereby simplify the structure, and reduce the loss of buggy in transportation process.

Because the utility model discloses a boiler system is favorable to the popularization and application of the ignition technique that economizes on fuel, consequently, the utility model discloses be particularly useful for being equipped with the condition of plasma ignition, tiny-oil ignition or the tiny-gas ignition etc. ignition that economizes on fuel in the boiler.

The invention will be further described with reference to two embodiments shown in fig. 1 and 2.

First, the embodiment shown in fig. 1 will be described.

In this embodiment, the boiler system includes a first boiler, a first coal mill, a second boiler, a second coal mill, and an inter-furnace coal fines delivery device.

The first boiler and the second boiler can both comprise a hearth, a primary air pipe, a burner and the like, wherein the primary air pipe is used for conveying pulverized coal to enter the hearth through the burner so as to meet the requirement of combustion. For the sake of distinction, the structural components of the first boiler and the structural components of the second boiler are named "first" and "second", respectively, i.e. the furnace, the primary air duct and the burner of the first boiler are referred to as first furnace, first primary air duct 1 and first burner, respectively, and the furnace, the primary air duct and the burner of the second boiler are referred to as second furnace, second primary air duct 2 and second burner, respectively.

The coal mill is a component of a coal pulverizing system and is used for grinding raw coal provided by the coal feeder to prepare coal powder with a certain particle size, and the coal powder is conveyed to the combustor through a primary air pipe. In this embodiment, the first coal mill and the second coal mill correspond to the first boiler and the second boiler, respectively, and are used for providing pulverized coal for the first boiler and the second boiler, respectively. The first primary air pipe 1 is connected with an outlet of a first coal mill, so that pulverized coal obtained by grinding by the first coal mill can be conveyed to a first hearth through a first combustor for combustion; and the second primary air pipe 2 is connected with an outlet of a second coal mill, so that pulverized coal obtained by grinding by the second coal mill can be conveyed to a second hearth through a second combustor for combustion.

The inter-furnace pulverized coal conveying device is used for transferring pulverized coal from the second primary air pipe 2 to the first primary air pipe 1, so that the first boiler can use part of the pulverized coal in the second primary air pipe 2 as ignition pulverized coal at the initial starting stage. Because under the effect of the coal powder conveying device between the furnaces, the coal powder concentration in the second primary air pipe 2 which is taken can meet the requirement of the first boiler in the initial starting stage, and the ignition in the initial starting stage can be completed without depending on the coal powder provided by the coal pulverizing system corresponding to the first boiler, therefore, the problem that the temperature and the pressure in the furnace are too fast due to the large coal feeding power of the coal pulverizing system can be effectively solved, so that the application of the oil-saving ignition technology in the initial starting stage of the boiler is possible, and the popularization and the application of the oil-saving ignition technology are facilitated.

Specifically, as shown in fig. 1, the inter-furnace pulverized coal conveying device of this embodiment includes an inter-furnace connecting pipe 32, an inter-furnace pulverized coal taking device 31, a pulverized coal mixing device 33, a power device 34, a first control valve 35, and a second control valve 36.

The inter-furnace connecting pipe 32 connects the first primary air pipe 1 and the second primary air pipe 2 to communicate the first primary air pipe 1 with the second primary air pipe 2, so that the pulverized coal in the second primary air pipe 2 can flow into the first primary air pipe 1.

First control valve 35 sets up on connecting pipe 32 between the stove for the break-make of connecting pipe 32 between the control stove, whether with the buggy by second primary air pipe 2 transport to first primary air pipe 1 in, and then be convenient for only just start the buggy conveyor between the stove when needs such as initial stage are started to first boiler, transport the buggy to first primary air pipe 1 by second primary air pipe 2.

The inter-furnace powder taking device 31 is disposed between the inter-furnace connecting pipe 32 and the second primary air pipe 2, and is used for communicating the second primary air pipe 2 with the inter-furnace connecting pipe 32, that is, in this embodiment, the inter-furnace connecting pipe 32 is communicated with the second primary air pipe 2 through the inter-furnace powder taking device 31. The inter-furnace pulverized coal taking device 31 can take part of pulverized coal from the second primary air pipe 2 and guide the taken pulverized coal to flow to the inter-furnace connecting pipe 32 more smoothly, so that the pulverized coal in the second primary air pipe 2 can be conveyed to the first primary air pipe 1 more conveniently. The inter-furnace pulverized coal taking device 31 may include a three-way pipe, two ports of the three-way pipe are connected between two sections of the second primary air pipe 2, and meanwhile, the other one port of the three-way pipe is connected to one end of the inter-furnace connecting pipe 32, so as to facilitate taking of part of pulverized coal in the second primary air pipe 2.

The pulverized coal mixing device 33 is disposed between the inter-furnace connecting pipe 32 and the first primary air duct 1, and is used for communicating the inter-furnace connecting pipe 32 with the first primary air duct 1, that is, in this embodiment, the inter-furnace connecting pipe 32 is communicated with the first primary air duct 1 through the pulverized coal mixing device 32. Pulverized coal conveyed to the first primary air pipe 1 by the second primary air pipe 2 and pulverized coal of the first primary air pipe 1 can be mixed at the pulverized coal mixing device 33, so that the concentration of pulverized coal flowing to the first pulverized coal burner is in a proper range, the pulverized coal concentration can be adjusted conveniently, and more stable combustion can be realized in the first hearth.

The power device 34 is used for driving the pulverized coal in the second primary air duct 2 to flow to the first primary air duct 1 through the inter-furnace connecting pipe 32, and providing power for the pulverized coal to flow from the second primary air duct 2 to the first primary air duct 1. Specifically, as can be seen from fig. 1, in this embodiment, the power device 34 is connected to the inter-furnace powder taking device 31; a second control valve 36 is provided on a connection pipe between the power unit 34 and the inter-furnace dust extraction unit 31, and the second control valve 36 controls on/off of the connection pipe between the power unit 34 and the inter-furnace dust extraction unit 31.

Through setting up power device 34, for the buggy by the second air hose 2 flow direction to the in-process of first air hose 1 provide main drive power, can reduce the wind speed of second air hose 2 and change the influence to defeated powder volume in buggy transportation process, guarantee the stability of supplying powder. And the second control valve 36 is arranged, so that the isolation function of the equipment after the equipment is deactivated can be achieved.

In addition, in this embodiment, the power plant 34 is arranged to be able to also regulate the flow of pulverized coal from the second primary duct 2 to the first primary duct 1, i.e. the power plant 34 also has the function of controlling the amount of pulverized coal. Therefore, the power device 34 is matched with the inter-furnace powder taking device 31 and the coal powder mixing device 33, and the requirements of the first combustor on different coal powder concentrations can be met conveniently.

In this embodiment, the power device 34 may include a compressed air jet mechanism or the like, so that the power device 34 not only has the function of driving the pulverized coal to flow, but also has the function of controlling the pulverized coal. The compressed air jet mechanism can comprise a compressed air inlet pipe, a fan and the like, so that under the driving action of the fan, compressed air can rapidly flow through the compressed air inlet pipe and enter the first primary air pipe 1 to rapidly flow together with pulverized coal.

The boiler system of the embodiment can realize the coal powder conveying between the primary air pipes of the two furnaces, and the working process can be as follows:

when the inter-furnace powder conveying is needed, the first control valve 35 and the second control valve 36 are opened, and the power device 34 is started, so that part of the coal powder in the second primary air pipe 2 enters the inter-furnace connecting pipe 32 through the inter-furnace powder taking device 31 under the driving of the power device 34 and reaches the coal powder mixing device 33, and the coal powder is conveyed to the first primary air pipe 1 through the coal powder mixing device 33;

and when the powder conveying between the furnaces is not needed, at least the first control valve 35 in the first control valve 35 and the second control valve 36 is closed, so that the pulverized coal conveying device between the furnaces can not convey the pulverized coal in the second primary air duct 2 to the first primary air duct 1.

Therefore, in this embodiment, the inter-furnace pulverized coal conveying device can directly take the pulverized coal from the primary air pipe of the other furnace (the second boiler) in a pneumatic conveying manner, and convey the pulverized coal to the primary air pipe of the furnace (the first boiler), so as to realize the transfer of the pulverized coal between the primary air pipe and the primary air pipe.

The pulverized coal concentration in the primary air pipe of the other furnace is more in line with the requirement of the furnace at the initial starting stage, so the scheme of the embodiment can smoothly realize the initial ignition of the furnace; and the initial ignition of the furnace is completed by the pulverized coal in the primary air pipe of the other furnace, so that the powder making system corresponding to the furnace can be completely free from working at the initial starting stage, the problem of too fast temperature rise and pressure rise in the furnace caused by too large initial fuel feeding amount of the powder making system of the furnace can be effectively avoided on the premise of not changing the structure of the powder making system of the furnace, and then the oil-saving ignition technology can be put into use at the initial starting stage of the furnace without being limited by the powder making system of the furnace, namely, the application of the oil-saving ignition technology at the initial ignition stage of the boiler can be realized.

Meanwhile, the powder taking mode from the primary air pipe to the primary air pipe is not limited by the pulverized coal bin, so that the pulverized coal bin extraction method is applicable to boilers with or without the pulverized coal bin, and is wide in application range, and the application range of the oil-saving ignition technology can be further expanded.

In addition, the inter-furnace pulverized coal conveying device can freely control the pulverized coal quantity and the pulverized coal concentration in a larger range, and provides pulverized coal with different concentrations for the furnace, so that the boiler system can meet different ignition requirements more flexibly.

In the above embodiment, the power device 34 is connected to the inter-furnace pulverized coal taking device 31, but actually, the position of the power device 34 is changed, and the inter-furnace pulverized coal conveying device can still realize the transfer process of pulverized coal from the other furnace primary air duct to the furnace primary air duct. The following description will be made by taking fig. 2 as an example.

As shown in fig. 2, this embodiment is different from the embodiment shown in fig. 1 in that the power unit 34 is not connected to the inter-furnace dust extraction device 31, but is connected to the inter-furnace connecting pipe 32. Accordingly, the second control valve 36 is not disposed on the connection pipeline between the power unit 34 and the inter-furnace dust extraction device 31, but is disposed on the connection pipeline between the power unit 34 and the inter-furnace connection pipe 32, and is used for controlling the on/off of the connection pipeline between the power unit 34 and the inter-furnace connection pipe 32.

It should be noted that the control of the flow rate of the pulverized coal flowing from the second primary air duct 2 to the first primary air duct 1 can be realized by the power device 34, and can also be realized by other means.

As one of them, this can be achieved under the action of a control valve. For example, the aforementioned first control valve 35 disposed on the inter-furnace connecting pipe 32 may be set to be not only used for controlling the on-off of the inter-furnace connecting pipe 32, but also used for controlling the flow rate of the pulverized coal flowing from the second primary air pipe 2 to the first primary air pipe 1 by changing the valve opening degree, so as to adjust the concentration of the pulverized coal flowing from the second primary air pipe 2 to the first primary air pipe 1, and meet the requirements of the first burner on different pulverized coal concentrations under different working conditions.

As another method, for example, the positions of the inter-furnace pulverized coal taking device 31 and/or the pulverized coal mixing device 33 can be adjusted to obtain pulverized coal with different concentrations, so as to meet the requirements of the burner on different pulverized coal concentrations.

The above description is only exemplary embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A boiler system, comprising:

the first boiler comprises a first primary air pipe (1);

the second boiler comprises a second primary air pipe (2); and

and the furnace coal powder conveying device is connected with the first primary air pipe (1) and the second primary air pipe (2) and conveys the coal powder in the second primary air pipe (2) to the first primary air pipe (1).

2. The boiler system according to claim 1, wherein the inter-furnace pulverized coal conveying device comprises an inter-furnace connecting pipe (32), and the inter-furnace connecting pipe (32) connects the first primary air duct (1) and the second primary air duct (2).

3. The boiler system according to claim 2, wherein the inter-furnace pulverized coal conveying device further comprises an inter-furnace pulverized coal taking device (31), and the inter-furnace pulverized coal taking device (31) is communicated with the second primary air pipe (2) and the inter-furnace connecting pipe (32); and/or, the inter-furnace pulverized coal conveying device further comprises a pulverized coal mixing device (33), and the pulverized coal mixing device (33) is communicated with the inter-furnace connecting pipe (32) and the first primary air pipe (1).

4. The boiler system according to claim 2, wherein the inter-furnace pulverized coal conveying device further comprises a first control valve (35), and the first control valve (35) is arranged on the inter-furnace connecting pipe (32) and used for controlling the on-off of the inter-furnace connecting pipe (32).

5. The boiler system according to any of claims 2-4, wherein the inter-furnace pulverized coal conveying device further comprises a power device (34), and the power device (34) drives pulverized coal in the second primary air duct (2) to flow to the first primary air duct (1) through the inter-furnace connecting pipe (32).

6. A boiler system according to claim 5, characterized in that the power plant (34) also regulates the flow of pulverized coal from the second primary duct (2) to the first primary duct (1).

7. The boiler system according to claim 5, wherein the power plant (34) comprises a compressed air jet mechanism.

8. The boiler system according to claim 5, wherein the power device (34) is connected with the inter-furnace connecting pipe (32), or the power device (34) is connected with an inter-furnace pulverized coal taking device (31) of the inter-furnace pulverized coal conveying device.

9. The boiler system according to claim 8, wherein the inter-furnace pulverized coal conveying device further comprises a second control valve (36), and the second control valve (36) is arranged on a connecting pipeline between the power device (34) and the inter-furnace connecting pipe (32) or the inter-furnace pulverized coal taking device (31) and is used for controlling the connection and disconnection of the connecting pipeline between the power device (34) and the inter-furnace connecting pipe (32) or the inter-furnace pulverized coal taking device (31).

10. The boiler system according to claim 1, further comprising a first coal mill providing coal dust for the first boiler and a second coal mill providing coal dust for the second boiler, and wherein the first primary air duct (1) is connected to an outlet of the first coal mill and the second primary air duct (2) is connected to an outlet of the second coal mill.