WO2017067272A1

WO2017067272A1 - Micro-gas combustion gun body, ignition burner, coal powder combustion system, and coal-fired boiler

Info

Publication number: WO2017067272A1
Application number: PCT/CN2016/093013
Authority: WO
Inventors: 蔡巍; 蔡飞; 崔学林; 唐宏; 牛涛; 王士清; 邵天成; 王鹏; 胡利杰
Original assignee: 烟台龙源电力技术股份有限公司
Priority date: 2015-10-20
Filing date: 2016-08-03
Publication date: 2017-04-27
Also published as: UA119391C2; CN105202544A

Abstract

A micro-gas combustion gun body, an ignition burner, a coal powder combustion system, and a coal-fired boiler, wherein the micro-gas combustion gun body comprises a combustion air duct (21), a gas supply device and an ignition device (24); the combustion air duct (21) comprises a combustion air inlet (211) and a flame opening (212); the gas supply means comprises a plurality of gas outlet parts, and the plurality of gas outlet parts and an ignition end of the ignition device (24) are disposed in the combustion air duct (21), the ignition end of the ignition device (24) is used to ignite the gas emitted from the plurality of gas outlet parts. Due to the gas supply device in the micro-gas combustion gun body comprising a plurality of gas outlet parts, during an ignition process, the micro-gas combustion gun body has a plurality of ignition points therein, and the plurality of ignition points can ignite each other and act as a combustion aid reciprocally. Hence, the micro-gas combustion gun body has a more stable flame.

Description

Micro-gas combustion gun body, ignition burner, pulverized coal combustion system and coal-fired boiler

Technical field

The invention relates to a thermomechanical machine, in particular to a micro-gas combustion gun body, an ignition burner, a pulverized coal combustion system and a coal-fired boiler.

Background technique

With the increasing shortage of global petroleum resources, gas has gradually become a major energy resource due to its economy and environmental protection. In particular, the ignition fuel in large coal-fired boilers in the power industry has begun to replace fuel fuel with gas fuel. In other developed countries, gas fuel has become the most important ignition fuel, and in China it is slowly turning to cleaner, more environmentally friendly gas fuel. Although gas resources are more economical, they are also non-renewable energy. At present, the ignition and stable combustion of coal-fired boilers in power plants require a large amount of gas fuel to heat the boilers, so more advanced technologies for saving gas fuels are needed.

In the prior art, there has been an ignition burner using a micro gas ignition which ignites the pulverized coal flow through a micro gas combustion gun body. However, the flame of the prior art micro gas combustion gun body is not stable enough.

Summary of the invention

The object of the present invention is to provide a micro gas combustion gun body, an ignition burner, a pulverized coal combustion system and a coal combustion boiler, wherein the flame of the micro gas combustion gun body is more stable, so that the ignition combustion with the micro gas combustion gun body The combustion of pulverized coal combustion systems and coal-fired boilers is more stable.

A first aspect of the present invention provides a micro gas combustion gun body including a combustion air cylinder, a gas supply device, and an ignition device, the combustion air cylinder including a combustion air inlet and a flame port, the gas supply device including a plurality of gas outlet portions The plurality of gas outlet portions and the ignition end of the ignition device are disposed in the combustion air cylinder, and the ignition end of the ignition device is configured to ignite the gas flowing out of the plurality of gas outlet portions.

Further, the gas supply device includes at least one gas gun including a gas gun inlet and a gas gun outlet in communication with the gas gun inlet, the plurality of fuels The gas outlet portion includes the gas gun outlet.

Further, the gas gun includes a gas gun tube and a gas gun head connected to the gas gun tube, the gas gun head being closer to the flame port than the gas gun tube, and the gas gun inlet is disposed at the gas gun On the gas gun tube, the gas gun outlet is disposed on the gas gun head.

Further, the gas gun outlet includes a plurality of air outlets disposed on the gas gun head, and each of the air outlets forms one of the gas outlet portions.

Further, the gas gun head is a rotating body having a central through hole communicating with the gas gun inlet, and the plurality of air outlet holes are disposed on a rotating surface of the rotating body and A circumferential through hole communicating with the center through hole and/or an end surface through hole provided on an end surface of the rotating body facing the flame port and communicating with the center through hole.

Further, the number of the circumferential through holes is plural.

Further, the plurality of circumferential surface through holes are arranged in a ring shape along a circumferential direction of the rotating body.

Further, an end of the central through hole facing the flame port is a constricted section, and the constricted section gradually decreases in diameter from a side farther from the flame port toward a side closer to the flame port. The end face through hole is connected to the outlet end of the neck portion.

Further, the rotating body includes a cylinder body and a frustum body, a large end of the frustum body is connected to the column body, the column body is connected to the gas gun tube, and the circumferential surface through hole is disposed in The neck portion is located in the frustum body, and the end surface through hole is disposed at a small end of the frustum body.

Further, the gas supply device includes a plurality of the gas guns, each of the gas guns including one of the gas gun tubes and the gas gun head connected to the gas gun tubes.

Further, the plurality of gas guns are evenly arranged around a central axis.

Further, the gas supply device further includes a gas collection box, the gas collection box includes a gas collection box inlet, and the plurality of gas outlet portions are in communication with the gas collection box.

Further, the micro gas combustion gun body further includes a stabilizing device for organizing the flow of the combustion air, the stabilizing device being disposed in the combustion air cylinder and located at the combustion air inlet and Between the flame ports, the plurality of gas outlets are located between the flame port and the stabilizing device.

Further, the stabilizing device comprises a porous structure or a swirling structure.

Further, the micro gas combustion gun body further includes a flame detecting device, and the detecting end of the flame detecting device is located in the combustion air cylinder.

A second aspect of the present invention provides an ignition burner comprising a combustor cylinder and a micro gas combustion gun body disposed on the combustor cylinder, wherein the micro gas combustion gun body is any one of the first aspects of the present invention In the micro gas combustion gun body, the flame port of the micro gas combustion gun body extends into the inside of the burner cylinder.

Further, the burner cylinder is a multi-stage cylinder, and the flame port of the micro-gas combustion gun body extends into the innermost inner cylinder of the multi-stage cylinder.

Further, the burner barrel includes a straight tube portion and a curved tube portion, and a flame port of the micro gas combustion gun body extends from the curved tube portion into the inside of the burner barrel.

Further, an air flow direction of the flame port of the micro gas combustion gun body and an air flow direction of the fuel flow at the flame port of the micro gas combustion gun body in the burner cylinder have an angle A, The angle A is greater than or equal to 0 degrees and less than or equal to 90 degrees.

A third aspect of the present invention provides a pulverized coal combustion system comprising an ignition burner, a gas assist system, a distribution air assist system, and a cold furnace pulverizing system, wherein the igniting burner is any one of the second aspect of the present invention An igniting burner, the burner barrel of the igniting burner being in communication with an outlet end of the chiller pulverizing system for delivering a fuel stream to the combustor barrel, the micro gas lance body of the igniting burner The plurality of gas outlets communicate with an outlet end of the gas assist system to deliver gas to the micro gas combustion gun body, and the combustion air inlet and the air distribution auxiliary system of the combustion air cylinder of the micro gas combustion gun body The outlet end is in communication to deliver oxygen for combustion of the gas to the micro gas combustion gun body.

Further, the gas auxiliary system includes a gas pipeline, a gas distribution valve, and a gas pressure detecting device.

Further, the air distribution auxiliary system includes a combustion air blower, a distribution air pipeline, a distribution air valve, and a distribution air pressure detecting device.

Further, the cold furnace pulverizing system comprises a pulverizing line, a heater and a powder mixing valve.

A fourth aspect of the invention provides a coal-fired boiler comprising a pulverized coal combustion apparatus, wherein the pulverized coal combustion apparatus is the pulverized coal combustion system according to any one of the third aspects of the invention.

According to the micro gas combustion gun body, the ignition burner, the pulverized coal combustion system and the coal-fired boiler provided by the present invention, since the gas supply device in the micro gas combustion gun body includes a plurality of gas outlet portions, the micro gas combustion during the ignition process The inside of the gun body has a plurality of ignition points, and the plurality of ignition points can mutually ignite and assist combustion, and therefore, the flame of the micro gas combustion gun body of the invention is more stable.

Other features and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic view showing the structure of a micro gas combustion gun body according to a specific embodiment of the present invention.

2 is a schematic side view of the structure of FIG. 1.

3 is a cross-sectional structural view showing the gas gun head of the micro gas combustion gun body shown in FIG. 1.

4 is a schematic view of an ignition burner and a pulverized coal combustion system having the same according to an embodiment of the present invention.

In Figures 1 to 4, the respective reference numerals respectively represent:

1. Burner cylinder;

11. Straight tube;

12. Curved pipe section;

111, the first cylinder;

2, micro gas combustion gun body;

21, combustion air cylinder;

211, combustion air inlet;

212, flame mouth;

22, gas gun;

221, gas gun head;

2211, gas gun exit;

2211A, circumferential through hole;

2211B, end face through hole;

2212, the center through hole;

222, gas gun tube;

2221, gas gun inlet;

23. Stabilizing device;

24. Ignition device;

25, gas gathering box;

251, a gas collection box inlet;

26. Flame detecting device;

3. Gas auxiliary system;

4. Air distribution auxiliary system;

5. Cold furnace powder making system.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. The following description of the at least one exemplary embodiment is merely illustrative and is in no way All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in the embodiments are not intended to limit the scope of the invention. In the meantime, it should be understood that the dimensions of the various parts shown in the drawings are not drawn in the actual scale relationship for the convenience of the description. Techniques, methods and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and apparatus should be It is considered part of the authorization specification. In all of the examples shown and discussed herein, any specific values are to be construed as illustrative only and not as a limitation. Accordingly, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in one figure, it is not required to be further discussed in the subsequent figures.

The micro gas combustion gun body of the present invention mainly comprises a combustion air cylinder, a gas supply device and an ignition device. The combustion air duct includes a combustion air inlet and a flame port. The gas supply device includes a plurality of gas outlets. A plurality of gas outlets and an ignition end of the ignition device are disposed in the combustion air cylinder. The ignition end of the ignition device is used to ignite the gas flowing out of the plurality of gas outlets.

Since the gas supply device of the micro gas combustion gun body comprises a plurality of gas outlet portions, the micro gas combustion gun body has a plurality of ignition points therein, and during the ignition process, the plurality of ignition points can mutually ignite and assist combustion. Therefore, the flame of the micro gas combustion gun body of the present invention is more stable. Further, since the flame of the micro gas combustion gun body is more stable, the combustion efficiency of the gas can also be improved.

1 to 3 show the structure of a micro gas combustion gun body of a preferred embodiment of the present invention. 1 is a schematic structural view of a micro gas combustion gun body according to a specific embodiment of the present invention; FIG. 2 is a side view structural view of FIG. 1; and FIG. 3 is a cross section of the gas gun head of the micro gas combustion gun body shown in FIG. A schematic diagram of the structure. The directions indicated by the arrows in Fig. 1 respectively represent the flow directions of the airflow of the respective components of the micro gas combustion gun body.

The micro gas combustion gun body 2 of the preferred embodiment of the present invention will be described in detail below with reference to Figs.

As shown in FIGS. 1 and 2, in the present embodiment, the micro gas combustion gun body 2 includes a combustion air cylinder 21, a gas supply device, a sound combustion device 23, an ignition device 24, and a flame detecting device 26. Among them, the fuel supply device includes a plurality of gas guns 22 and a gas header 25.

The combustion air cylinder 21 provides oxygen for combustion of the gas combustion, and can be used as a pre-combustion chamber for initial combustion of the gas. The combustion air cylinder 21 has a combustion air inlet 211 and a flame port 212, and the flame 212 of the micro-combustion gun body 2 is flamed. Port 212 flows out. The fuel supply device provides the gas required for ignition.

Ignition device 24 is used to ignite the mixture of gas and combustion air. Ignition device can be electricity lighter.

As shown in FIGS. 1 and 3, the gas gun 22 has a gas gun inlet 2221 and a gas gun outlet 2211 in communication with the gas gun inlet 2221, and the plurality of gas outlets includes a gas gun outlet 2211. Setting up a gas gun can better organize the flow of gas.

As shown in FIG. 1, the gas gun 22 includes a gas barrel 222 and a gas gun head 221 connected to the gas barrel 222. The gas gun head 221 is closer to the flame port than the gas gun tube 222, and the gas gun inlet 2221 is disposed on the gas gun tube 222. Further, as shown in FIG. 3, the gas gun outlet 2211 is disposed on the gas gun head 221. The gas barrel 222 delivers gas to the gas gun head 221.

In the present embodiment, each gas gun 22 includes a gas gun tube 222 and a gas gun head 221 connected to the gas gun tube 222. Therefore, each gas gun head 221 has a gas gun tube 222 that is independently supplied with air. This setting facilitates the distribution and organization of the gas flowing out of each gas gun head 221. In other embodiments not shown, a gas gun can also be configured with a plurality of gas gun heads. For example, the gas gun tube can be annular, and an annular passage can be provided in the gas gun tube to make a plurality of gas gun heads. Arranged at the exit of the annular passage.

Preferably, in the present embodiment, the plurality of gas guns 22 are evenly arranged around a central axis. The arrangement can make the plurality of gas gun outlets 2211 annularly distributed, so that the gas discharged from the plurality of gas gun outlets 2211 can mutually ignite and assist each other, thereby making the micro gas combustion gun body The combustion is more stable.

In this embodiment, the gas gun outlet 2211 includes a plurality of air outlets disposed on the gas gun head 221, and each of the air outlets forms a gas outlet. This arrangement allows each gas gun head 211 to have a plurality of ignition points by itself, and these ignition points can also ignite and assist each other, thereby making the combustion of the gas injected from each gas gun head 211 more stable. Further, the combustion of the micro gas combustion gun body is further stabilized.

Preferably, the gas gun head 221 is a rotating body having a central through hole 2212. The center through hole 2212 is in communication with the gas gun inlet 221. The plurality of air outlet holes include a circumferential surface through hole 2211A provided in a rotating surface of the rotating body and communicating with the center through hole 2212, and an end surface provided on an end surface of the rotating body facing the flame port 212 and communicating with the center through hole 2212 Through hole 2211B.

Although in principle the gas gun head only includes a circumferential through hole or only includes an end face through hole Enhance the stability of the gas gun combustion, but at the same time, the circumferential through hole and the end through hole can be arranged to make the flame at each ignition point face different directions, so that better mutual ignition and combustion support effect can be achieved, and the gas gun is more favorable. Head and micro gas combustion gun body combustion stability.

As shown in FIG. 3, the number of the circumferential surface through holes 2211A is plural, and specifically, six in the present embodiment, but the number of the circumferential surface through holes 2211A may vary, for example, may be set to any of 2 to 10 It is also possible to provide more than 10 circumferential through holes when the number of gas heads is large to allow more circumferential through holes. It is also not excluded that only one circumferential through hole is provided.

Further, in the present embodiment, the plurality of circumferential surface through holes 2211A are arranged in a ring shape in the circumferential direction of the rotary body. This arrangement makes each gas gun head 221 venting evenly, which is favorable for combustion stability. However, in other embodiments not shown, the plurality of circumferential through holes may also be arranged in two or more annular shapes, and the circumferential through holes between the annular shape and the annular shape may be arranged in a row along the axis of the rotary body, or may be arranged in a wrong position. They may not be arranged in a ring shape or even randomly arranged.

In this embodiment, the number of the end surface through holes 2211B is one, and the end surface through holes 2211B are coaxial with the central through hole 2212. However, in other embodiments, the number of the end face through holes 2211B may be plural, for example, any number of 2 to 10 or more than 10, and when the number of the end face through holes is plural, the rows of the plurality of end face through holes The cloth may be arranged in a regular manner, for example, uniformly arranged around the rotation axis of the rotary body, and may be arranged in an array on the end faces of the plurality of end face through holes, for example, or may be irregularly arranged.

Further, although the circumferential surface through hole 2211A in the present embodiment is a radial through hole whose axis is perpendicular to the axis of the center through hole 2212, the end surface through hole 2211B is an axial through hole coaxial with the axis of the center through hole 2212. However, in other embodiments not shown, the circumferential direction of the circumferential through hole and the end surface through hole may be changed. For example, the circumferential through hole need not necessarily be perpendicular to the axis of the central through hole, but may be other The angle, the axis of the end face through hole may not be coaxial (or parallel) with the axis of the central through hole, but may have a certain angle with the axis of the central through hole.

Further preferably, the end of the central through hole 2212 facing the flame port is a constricted section, and the diameter of the constricted section gradually decreases from a side farther from the flame port to a side closer to the flame port, and the end face through hole 2211B and The outlet end of the necking section is connected. This arrangement can reduce the kinetic energy loss caused by the turbulent flow of the gas, and also facilitate the distribution of the gas between the plurality of air outlets.

As shown in FIG. 3, in the embodiment, the rotating body comprises a cylinder body and a frustum body. The large end of the frustum body is connected with the column body, the column body is connected with the gas barrel 222, and the circumferential surface through hole 2211A is disposed on the column body. The constricted section is located in the frustum, and the end through hole 2211B is disposed at the small end of the frustum. Specifically, the necking section is a tapered necking section. The shape of the neck portion may not be limited to the tapered neck portion, for example, it may also be a neck portion with a curved section as a bus bar.

The gas supply device further includes a gas header tank 25, and the gas header tank 25 includes a gas header tank inlet 251, and the plurality of gas outlet portions are in communication with the gas header tank 25. The gas header 25 is used to distribute and deliver gas to a plurality of gas guns 22.

As shown in FIG. 1, in the present embodiment, the gas collecting box 25 is disposed at one end of the combustion air cylinder 21 of the micro gas combustion gun body 2 opposite to the flame port 212, the gas gun 22 is in the shape of a straight rod, and the gas gun head 221 is facing the flame. The port 212, the gas gun inlet 2221 of the gas barrel 222 extends into the tank wall of the gas header 25 near the combustion air cylinder 21 and communicates with the internal space of the gas header 25, so that the gas header 25 can be accessed from the gas header 251 intake air, and the gas is more uniformly fed into each gas gun 22 through the gas gun inlet 2221 of each gas gun 22.

The steady combustion device 23 is disposed in the combustion air cylinder 21 between the combustion air inlet 211 and the flame port 212, and the plurality of gas outlets are located between the flame port 212 and the combustion device 23. As shown in FIG. 1, in the present embodiment, the gas gun heads 221 of the gas guns 22 are disposed between the flame port 212 and the stabilizing device 23, so that the gas outlets on the gas gun head 221 are also the gas outlet portions. Both are located between the flame port 212 and the stabilizing device 23. The position of the steady combustion device 23 and the steady combustion device 23 is such that the combustion air flows to the gas outlet portion in an organized manner to facilitate stable combustion of the gas.

Preferably, the stabilizing device 23 comprises a porous structure or a swirling structure. The primary purpose of the stabilizing device 23 is to rectify or generate a return flow to provide oxygen to the gas and facilitate stable combustion of the gas.

As shown in FIG. 1, the detection end of the flame detecting device 26 is located inside the combustion air cylinder 21. The flame detecting device 26 can determine the ignition state of the gas.

The micro gas combustion gun body 2 of this embodiment is a novel gas ignition gun. Since this embodiment employs a structure in which a plurality of gas gun heads are arranged in a ring shape and each gas gun head 221 also forms an annular combustion flame, the mutual cooperation of the plurality of gas gun heads 221, and each gun The mutual matching of the end face through hole and the peripheral face through hole can obtain a stable high temperature gas flame and effectively improve the combustion efficiency of the gas.

4 is a schematic view of an ignition burner and a pulverized coal combustion system having the same according to an embodiment of the present invention. The directions indicated by the arrows in Fig. 4 represent the flow directions of the airflow of the various components of the pulverized coal combustion system, respectively.

As shown in FIG. 4, an embodiment of the present invention further provides an ignition burner including a burner cylinder 1 and a micro gas combustion gun body 2 disposed on the combustor cylinder 1, wherein the micro gas combustion gun body 2 is In the aforementioned micro gas combustion gun body 2, the flame port 212 of the micro gas combustion gun body 2 projects into the inside of the burner cylinder 1.

The burner barrel 1 can be a multi-stage cylinder, in which case preferably the outlet end of the micro-gas combustion gun body 2 projects into the innermost first stage cylinder of the multi-stage cylinder.

In the embodiment shown in Fig. 4, the combustor can 1 is a secondary cartridge. In other embodiments not shown, the combustor can be a multi-stage cartridge of three or more stages, for example, a ten-stage can be achieved. Of course, the burner barrel can also be a single stage cylinder.

In the present embodiment, preferably, the combustor can 1 includes a straight cylindrical portion 11 and a curved portion 12 through which the flame port 212 of the micro gas combustion gun body 2 projects from the curved pipe portion 12.

As shown in FIG. 4, in the present embodiment, the airflow direction of the flame port 212 of the micro gas combustion gun body 2 and the airflow direction of the fuel flow at the flame port 212 of the micro gas combustion gun body 2 in the combustor cylinder 1 are shown. There is an angle A between them. Preferably, the angle A is greater than or equal to 0 degrees and less than or equal to 90 degrees. In the present embodiment, the angle A is an acute angle, and the angle A is expressed as an angle between the axis of the micro gas combustion gun body 2 and the axis of the straight portion 111.

Further, as shown in FIG. 4, the outlet end of the micro gas combustion gun body 2 has a distance L from the outlet end of the combustor cylinder 1. Preferably, the distance L is greater than or equal to 0 meters and less than or equal to 10 meters.

As shown in FIG. 4, the embodiment further provides a pulverized coal combustion system including an ignition burner, a gas auxiliary system 3, a distribution auxiliary system 4, and a cold furnace pulverizing system 5.

Wherein, the ignition burner is the aforementioned ignition burner. The burner barrel 1 of the ignition burner communicates with the outlet end of the cold furnace pulverizing system 5 to deliver a flow of fuel to the combustor barrel 1. The micro gas combustion gun body 2 of the ignition burner has an independent ignition function. The plurality of gas outlet portions of the micro gas combustion gun body 2 of the ignition burner communicate with the outlet end of the gas assist system 3 to deliver the gas to the micro gas combustion gun body 2. The combustion air inlet 211 of the combustion air cylinder 21 of the micro gas combustion gun body 2 communicates with the outlet end of the air distribution assisting system 4 to deliver oxygen for gas combustion to the micro gas combustion gun body 2.

The gas assist system 3 provides stable gas for the micro gas combustion gun body 2. The gas may be any combustible gas such as industrial methane, coke oven gas, biomass gas, oil and gas. The gas assist system 3 includes a gas line, a gas distribution valve, and a gas pressure detecting device.

The air distribution assisting system 4 supplies the gas required for combustion to the gas discharged from the micro gas combustion gun body 2. The air distribution auxiliary system 4 includes a combustion air blower, a distribution air pipeline, a distribution air valve, and a distribution air pressure detecting device.

The cold furnace pulverizing system 5 ensures the source of pulverized coal at the beginning of the boiler start-up. The cold furnace pulverizing system 5 includes a pulverizing line, a heater, and a powder mixing valve. The cold furnace pulverizing system 5 provides a source of pulverized coal by means of coal.

At the initial stage of the ignition of the boiler, the micro-gas combustion gun body 2, the gas auxiliary system 3 and the air distribution auxiliary system 4 form a local high temperature after the combustion of the gas to ignite the pulverized coal gas flow from the cold-storage system 5 into the burner cylinder 1. The pulverized coal powder is sprayed into the boiler to heat the boiler, thereby realizing the process of replacing coal with coal.

Embodiments of the present invention also provide a coal fired boiler including the foregoing pulverized coal combustion system.

According to the above description, the above embodiment of the present invention has the following advantages:

The gas supply device in the micro gas combustion gun body comprises a plurality of gas outlet portions, which can have a plurality of ignition points inside the micro gas combustion gun body, and multiple ignition points can mutually ignite and assist combustion during the ignition process. Therefore, the flame of the micro gas combustion gun body of the present invention is more stable.

The ignition burner, the pulverized coal combustion system and the coal-fired boiler having the pulverized coal combustion system make the fuel flow combustion more stable due to the use of a more stable micro gas combustion gun body.

The pulverized coal combustion system and the coal-fired boiler having the pulverized coal combustion system, compared with the prior art, when the prior art coal-fired boiler is ignited, the gas is first heated by the gas fuel. When the temperature reaches a certain height, the pulverized coal is sprayed, and when the pulverized coal combustion system of the invention is used, the pulverized coal is directly ignited in the burner cylinder by the micro gas combustion gun body when the boiler is ignited, and then ignited. The pulverized coal feeds the boiler to heat up, and realizes the process of replacing coal with coal during the heating process of the boiler. Therefore, the pulverized coal combustion system can solve the problem of excessive consumption of gas fuel of the coal-fired boiler using gas ignition, and greatly save the gas consumption. After calculation, the pulverized coal combustion system is adopted in the coal-fired boiler, and the gas fuel saving rate can reach more than 80%.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that The invention is not limited to the spirit of the technical solutions of the present invention, and should be included in the scope of the technical solutions claimed in the present invention.

Claims

A micro gas combustion gun body characterized by comprising a combustion air cylinder (21), a gas supply device and an ignition device (24), the combustion air cylinder (21) comprising a combustion air inlet (211) and a flame port (212) The gas supply device includes a plurality of gas outlet portions, and the plurality of gas outlet portions and the ignition end of the ignition device (24) are disposed in the combustion-supporting air cylinder (21), the ignition device (24) The ignition end is used to ignite the gas flowing out of the plurality of gas outlets.
The micro gas combustion gun body according to claim 1, wherein said gas supply means comprises at least one gas gun (22), said gas gun (22) comprising a gas gun inlet (2221) and said gas A gun inlet (2211) is connected to the gas gun outlet (2211), and the plurality of gas outlets includes the gas gun outlet (2211).
The micro gas combustion gun body according to claim 2, wherein the gas gun (22) comprises a gas gun tube (222) and a gas gun head (221) connected to the gas gun tube (222), The gas gun head (221) is closer to the flame port (212) than the gas gun tube (222), and the gas gun inlet (2221) is disposed on the gas gun tube (222), the gas A gun outlet (2211) is disposed on the gas gun head (221).
The micro gas combustion gun body according to claim 3, wherein said gas gun outlet (2211) comprises a plurality of air outlet holes provided on said gas gun head (221), each of said air outlet holes being formed One of the gas outlets.
The micro gas combustion gun body according to claim 4, wherein said gas gun head (221) is a rotating body having a center through hole (2212), said center through hole (2212) and said gas gun The inlet (2221) is in communication, and the plurality of air outlets include a circumferential surface through hole (2211A) disposed on the rotating surface of the rotating body and communicating with the central through hole (2212) and/or disposed on the rotating An end face through hole (2211B) of the body facing the end face of one end of the flame port (212) and communicating with the center through hole (2212).
The micro gas combustion gun body according to claim 5, wherein the number of the circumferential surface through holes (2211A) is plural.
The micro gas combustion gun body according to claim 6, wherein said plurality The circumferential surface through holes (2211A) are arranged in a ring shape in the circumferential direction of the rotating body.
The micro gas combustion gun body according to claim 5, wherein one end of the center through hole (2212) facing the flame port is a constricted portion, and the constricted portion is away from the flame port. The far side gradually decreases in diameter toward a side closer to the flame port, and the end face through hole (2211B) is connected to the outlet end of the neck portion.
A micro gas combustion gun body according to claim 3, wherein said gas supply means comprises a plurality of said gas guns (22), each of said gas guns (22) comprising one of said gas gun tubes ( 222) and the gas gun head (221) connected to the gas barrel (222).
The micro gas combustion gun body according to claim 9, wherein said plurality of gas guns (22) are evenly arranged around a central axis.
The micro gas combustion gun body according to claim 1, wherein the gas supply device further comprises a gas header (25), the gas header (25) comprising a gas header inlet (251), A plurality of gas outlets are in communication with the gas header (25).
The micro gas combustion gun body according to claim 1, wherein said micro gas combustion gun body further comprises a stabilizing device (23) for organizing a flow of combustion air, said stabilizing device (23) being disposed at The combustion air cylinder (21) is located between the combustion air inlet (211) and the flame port (212), and the plurality of gas outlets are located at the flame port (212) and the steady combustion Between devices (23).
The micro gas combustion gun body according to claim 1, wherein the micro gas combustion gun body further comprises a flame detecting device (26), and the detecting end of the flame detecting device (26) is located in the combustion air cylinder (21).
An ignition burner comprising a burner cylinder (1) and a micro gas combustion gun body (2) disposed on the burner cylinder (1), wherein the micro gas combustion gun body (2) The micro gas combustion gun body according to claim 1, wherein a flame port (212) of the micro gas combustion gun body (2) projects into the inside of the burner cylinder (1).
The igniting burner according to claim 14, wherein the burner cylinder (1) is a multi-stage cylinder, and a flame port (212) of the micro gas combustion gun body (2) extends into the The innermost inner cylinder of the multi-stage cylinder.
The ignition burner according to claim 14, characterized in that the burner cylinder (1) comprises a straight portion (11) and a curved portion (12), and the flame of the micro-combustion gun body (2) A port (212) extends from the curved portion (12) into the interior of the burner block (1).
The igniting burner according to claim 14, wherein a direction of a gas flow of the flame port (212) of the micro gas combustion gun body (2) and the inside of the burner cylinder (1) are located in the micro The direction of the flow of the fuel stream at the flame port (212) of the gas burner body (2) has an angle A between the angle A greater than or equal to 0 degrees and less than or equal to 90 degrees.
A pulverized coal combustion system, comprising: an ignition burner, a gas auxiliary system (3), a distribution auxiliary system (4), and a cold furnace pulverizing system (5), wherein the ignition burner is according to claim 14. The ignition burner, the burner cylinder (1) of the ignition burner communicates with an outlet end of the cold furnace pulverizing system (5) to deliver a fuel flow to the burner cylinder (1), The plurality of gas outlet portions of the micro gas combustion gun body (2) of the ignition burner communicate with an outlet end of the gas assist system (3) to deliver gas to the micro gas combustion gun body (2), The combustion air inlet (211) of the combustion air cylinder (21) of the micro gas combustion gun body (2) communicates with the outlet end of the air distribution assisting system (4) for transporting the micro gas combustion gun body (2) Oxygen that is burned in the gas.
The pulverized coal combustion system according to claim 18, wherein the gas auxiliary system (3) comprises a gas line, a gas distribution valve, and a gas pressure detecting device; and/or the air distribution auxiliary system (4) The utility model comprises a combustion-supporting fan, a distribution air pipeline, a distribution air valve and a distribution air pressure detecting device; and/or the cold furnace pulverizing system (5) comprises a pulverizing pipeline, a heater and a powder mixing valve.
A coal-fired boiler comprising a pulverized coal combustion apparatus, characterized in that the pulverized coal combustion apparatus is the pulverized coal combustion system according to claim 18.