Blending combustion biomass pulverized coal boiler

Abstract

The utility model belongs to the technical field of boilers, and particularly relates to a biomass pulverized coal blending combustion boiler which comprises a boiler body. The combustors comprise a plurality of primary air ducts and secondary air ducts which are arranged in a stacked mode, the primary air ducts are suitable for conveying high-temperature air and pulverized coal into the boiler body, the secondary air ducts are suitable for conveying high-temperature air into the boiler body, spray pipes are connected into the secondary air ducts in an inserted mode, and the spray pipes are suitable for conveying biomass fuel into the boiler body; the outlet of the spray pipe is centrally arranged at the outlet of the secondary air duct; pulverized coal and biomass fuel are separately conveyed, high-temperature air is introduced into the secondary air duct, the biomass fuel is prevented from being burnt too early, the outlet of the spray pipe is arranged in the middle of the secondary air duct, the pipe wall at the outlet of the spray pipe can be lowered, the biomass fuel is prevented from being ignited when making contact with the pipe wall at the outlet of the spray pipe, and the service life of the biomass fuel is prolonged. And the spray pipe is damaged due to high-temperature creep deformation.

Description

Technical Field

[0001] The utility model belongs to the technical field of boilers, and particularly relates to a biomass pulverized coal co-firing boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes the chemical energy in the fuel and electrical energy. The boiler outputs steam, high-temperature water or organic heat carriers with a certain amount of heat energy. Existing boilers usually adopt the coupled combustion of biomass and pulverized coal. The two fuels are blown into the furnace through the air supply pipeline for combustion. And because the ignition point of pulverized coal is relatively high, high-temperature air is needed to preheat the pulverized coal in the air duct. However, due to the relatively low ignition point of biomass fuel, it is easy to cause the biomass fuel to burn at the outlet of the air supply pipeline or even in the air supply pipeline, resulting in the high-temperature creep of the air supply pipeline and damage.

[0003] Therefore, how to avoid the damage of the air supply pipeline caused by the premature combustion of biomass fuel is a technical problem that needs to be solved urgently in this field.

[0004] It should be noted that the above information disclosed in this background art part is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Utility Model

[0005] The embodiments of the present disclosure at least provide a biomass pulverized coal co-firing boiler.

[0006] In a first aspect, the embodiments of the present disclosure provide a biomass pulverized coal co-firing boiler, including: a boiler body; a plurality of burners, the burners including a plurality of primary air ducts and secondary air ducts stacked on top of each other. The primary air ducts are adapted to convey high-temperature air and pulverized coal into the boiler body, the secondary air ducts are adapted to convey high-temperature air into the boiler body. A spray pipe is inserted into the secondary air ducts. The spray pipe is adapted to convey biomass fuel into the boiler body, and the outlet of the spray pipe is centrally arranged at the outlet of the secondary air ducts.

[0007] In an optional implementation manner, the primary air ducts and the secondary air ducts are arranged at intervals so that there is enough air above and below the primary air ducts.

[0008] In an optional implementation manner, a secondary air duct is arranged above the uppermost secondary air duct, and the spray pipe is arranged in this secondary air duct so that the biomass fuel enters the furnace from the upper part of the furnace.

[0009] In an optional implementation manner, the spray pipe is suspended in the secondary air duct through a bracket.

[0010] In an alternative embodiment, an oil injector is provided in the lowermost secondary air duct so that the oil injector injects fuel towards the lower part of the furnace, and the oil injector is overhead in the secondary air duct through a bracket.

[0011] In an alternative embodiment, the primary air duct and the secondary air duct are square pipes, and the mouth of the secondary air duct is constricted to increase the air outlet speed.

[0012] In an alternative embodiment, the boiler body is a cube, and the burner is arranged at the vertex angle of the boiler body.

[0013] In an alternative embodiment, the burner outlet faces the axis of the boiler body, and the outlet direction of the burner forms an angle with the diagonal of the cross-section of the boiler body, and the angle is 3.25° - 4.25°.

[0014] In an alternative embodiment, air inlet pipes are provided on both sides of the boiler body, and the air inlet pipes are connected to the burners on the same side.

[0015] The beneficial effect of the present utility model is that in this biomass pulverized coal co-firing boiler, the pulverized coal and the biomass fuel are separately transported, and high-temperature air is introduced into the secondary air duct to avoid premature combustion of the biomass fuel. And because the high temperature in the furnace is easily transferred to the pipe wall of the secondary air duct by heat conduction, the outlet of the nozzle is centered in the secondary air duct, which can reduce the problem of the pipe wall at the outlet of the nozzle and avoid the biomass fuel from being ignited when it contacts the pipe wall at the outlet of the nozzle, resulting in high-temperature creep of the nozzle.

[0016] Other features and advantages of the present utility model will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the specification, the claims, and the drawings.

[0017] To make the above-mentioned objectives, features, and advantages of the present utility model more obvious and understandable, specific preferred embodiments are hereby given, and in conjunction with the accompanying drawings, the following detailed description is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Top view of a biomass pulverized coal co-firing boiler provided by an embodiment of the present disclosure;

[0020] Figure 2 Front view of a burner provided by an embodiment of the present disclosure;

[0021] Figure 3 Side view of a burner provided by an embodiment of the present disclosure.

[0022] In the figure:

[0023] 1. Boiler body; 11. Air inlet pipe;

[0024] 2. Burner; 21. Primary air duct; 22. Secondary air duct; 22a. Nozzle; 22b. Oil injector. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] In this document, when it is mentioned that the first component is located on the second component, this may mean that the first component can be directly formed on the second component, or a third component can be inserted between the first component and the second component. In addition, in the drawings, for the effective description of the technical content, the thickness of the components can be exaggerated or reduced.

[0027] In this document, when an element or layer is referred to as "being located on", "joined to", "connected to", "attached to", or "coupled to" another element or layer, it can be directly located on, joined, connected, attached, or coupled to the other element or layer, or there may be intermediate elements or layers. In contrast, when an element is referred to as "directly on another element or layer", "directly joined to", "directly connected to", "directly attached to", or "directly coupled to" another element or layer, there may be no intermediate elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (for example, "between" vs. "directly between", "adjacent" vs. "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the related listed items.

[0028] In this document, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0029] The terms used herein are only for describing specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an", and "the" may also be intended to include the plural forms, unless clearly indicated otherwise in the context. The terms "comprising", "including", and "having" are inclusive, and thus specify the presence of the specified features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an order of execution. Additional or alternative steps may be employed.

[0030] As used herein, phrases such as "in one embodiment", "according to one embodiment", "in some embodiments", etc. generally refer to the fact that the specific feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Thus, a specific feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example", "exemplary", etc. are used "as an example, instance, or illustration. Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other embodiments, aspects, or designs. Instead, the use of the terms "example", "exemplary", etc. is intended to present concepts in a specific manner.

[0031] It has been found through research that biomass fuel in the prior art is prone to burning at the outlet of the pipeline, resulting in high-temperature creep at the pipeline outlet, which is the problem and purpose to be solved by the utility model.

[0032] Based on the above research, the embodiments of the present disclosure provide a co-firing biomass pulverized coal boiler. By separately transporting pulverized coal and biomass fuel, it is possible to avoid the premature ignition of biomass fuel by contacting high-temperature air.

[0033] Regarding the defects existing in the above solutions, they are all the results obtained by the utility model inventors through practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed in this document by the present disclosure for the above problems should all be the contributions made by the utility model inventors to the present disclosure during the process of the present disclosure.

[0034] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] The following will, with reference to the drawings, elaborate on some embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0036] See Figures 1-3 , which shows a biomass co-fired pulverized coal boiler, including: a boiler body 1; a plurality of burners 2, the burners 2 including a plurality of primary air ducts 21 and secondary air ducts 22 arranged in a stacked manner, the primary air ducts 21 being adapted to convey high-temperature air and pulverized coal into the boiler body 1, the secondary air ducts 22 being adapted to convey high-temperature air into the boiler body 1, a spray pipe 22a being inserted into the secondary air ducts 22, the spray pipe 22a being adapted to convey biomass fuel into the boiler body 1, and the outlet of the spray pipe 22a being centrally arranged at the outlet of the secondary air ducts 22; in short, this biomass co-fired pulverized coal boiler separates the conveyance of pulverized coal and biomass fuel, and high-temperature air is introduced into the secondary air ducts 22 to avoid premature combustion of the biomass fuel. And since the high temperature in the furnace is easily transferred to the pipe wall of the secondary air ducts 22 by heat conduction, the outlet of the spray pipe 22a is centrally arranged in the secondary air ducts 22, which can reduce the problems of the pipe wall at the outlet of the spray pipe 22a and avoid the biomass fuel being ignited when it contacts the pipe wall at the outlet of the spray pipe 22a, resulting in high-temperature creep of the spray pipe 22a.

[0037] In some embodiments, the primary air ducts 21 and the secondary air ducts 22 are arranged at intervals so as to have sufficient air above and below the primary air ducts 21; in short, the primary air ducts 21 and the secondary air ducts 22 being arranged at intervals can ensure sufficient oxygen around the pulverized coal and ensure the combustion efficiency of the pulverized coal.

[0038] In some embodiments, a secondary air duct 22 is arranged above the uppermost secondary air duct 22, and the spray pipe 22a is arranged in this secondary air duct 22 so that the biomass fuel enters the furnace from the upper part of the furnace; in short, the spray pipe 22a is arranged at a position far from the primary air ducts 21 to avoid premature ignition of the biomass fuel.

[0039] In some embodiments, the spray pipe 22a is arranged in the secondary air ducts 22 in a suspended manner by brackets; in short, the spray pipe 22a is entirely suspended in the secondary air ducts 22, not limited to the mouth of the spray pipe 22a. Normal-temperature air is continuously blown into the spray pipe 22a to convey the biomass fuel, and the spray pipe 22a is cooled by the normal-temperature air. At the same time, it can avoid the direct conduction of the heat of the pipe wall of the secondary air ducts 22 to the spray pipe 22a.

[0040] In some embodiments, an oil injector 22b is disposed in the lowermost secondary air duct 22, so that the oil injector 22b injects fuel into the lower part of the furnace, and the oil injector 22b is overhead-mounted in the secondary air duct 22 through a bracket; in short, by providing the oil injector 22b, fuel can be injected into the lower part of the furnace for ignition and combustion support, improving the combustion efficiency of pulverized coal.

[0041] In some embodiments, the primary air duct 21 and the secondary air duct 22 are square ducts, and the mouth of the secondary air duct 22 is constricted to increase the air outlet velocity; in short, the constricted setting of the mouth of the secondary air duct 22 can quickly blow the pulverized coal evenly in the furnace.

[0042] In some embodiments, the boiler body 1 is a cube, and the burner 2 is disposed at the vertex angle of the boiler body 1; in short, the burners 2 are provided at all the vertex angles of the boiler body 1, which can make the distribution of pulverized coal relatively uniform, improve the combustion efficiency, and at the same time make the air flow for maintaining combustion evenly distributed.

[0043] In some embodiments, the outlet of the burner 2 faces the axis of the boiler body 1, and the outlet direction of the burner 2 forms an angle (i.e., α) with the diagonal of the cross-section of the boiler body 1, and the angle is 3.25° - 4.25°; in short, the setting of the angle α can make the air in the furnace spiral, making the combustion in the furnace more complete.

[0044] In some embodiments, air inlet pipes 11 are provided on both sides of the boiler body 1, and the air inlet pipes 11 are connected to the burners 2 on the same side; in short, air can be supplied to the burners 2 through the air inlet pipes 11.

[0045] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second" and other numerical terms used herein do not imply order or sequence unless clearly indicated in the text. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer or section discussed above may be referred to as the second element, component, region, layer or section.

[0047] Spatially relative terms, such as "inner", "outer", "below", "beneath", "lower", "above", "upper", etc., may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures. In addition to the orientation depicted in the figures, spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is turned over, an element described as "below" or "beneath" another element or feature will then be oriented "above" the other element or feature. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein are to be interpreted accordingly.

[0048] In the above discussion, unless otherwise specified, when used to describe a numerical value, terms such as "about", "approximately", "substantially", etc. mean a variation of + / −10% of that value.

[0049] Inspired by the above-described ideal embodiments of the present utility model, through the above description, relevant staff can, without departing from the technical idea of the present utility model, make various changes and modifications. The technical scope of the present utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A biomass-blended pulverized coal boiler, characterized in that, Including: The boiler main body (1); A plurality of burners (2), the burners (2) include a plurality of primary air ducts (21) and secondary air ducts (22) arranged in layers, the primary air ducts (21) are adapted to convey high-temperature air and pulverized coal into the boiler main body (1), the secondary air ducts (22) are adapted to convey high-temperature air into the boiler main body (1), a spray pipe (22a) is inserted into the secondary air ducts (22), and the spray pipe (22a) is adapted to convey biomass fuel into the boiler main body (1), and The outlet of the spray pipe (22a) is centered at the outlet of the secondary air duct (22).

2. The biomass pulverized coal co-firing boiler according to claim 1, wherein The primary air ducts (21) and the secondary air ducts (22) are arranged at intervals so that there is sufficient air above and below the primary air ducts (21).

3. The biomass pulverized coal co-firing boiler according to claim 2, wherein A secondary air duct (22) is arranged above the uppermost secondary air duct (22), and the spray pipe (22a) is arranged in this secondary air duct (22) so that the biomass fuel enters the furnace from the upper part of the furnace.

4. The biomass pulverized coal co-firing boiler according to claim 3, wherein The spray pipe (22a) is suspended in the secondary air duct (22) through a bracket.

5. The biomass pulverized coal co-firing boiler according to claim 4, wherein An oil nozzle (22b) is arranged in the lowermost secondary air duct (22) so that the oil nozzle (22b) sprays fuel towards the lower part of the furnace, and The oil nozzle (22b) is suspended in this secondary air duct (22) through a bracket.

6. The biomass pulverized coal co-firing boiler according to claim 5, wherein The primary air ducts (21) and the secondary air ducts (22) are square pipes, and the mouths of the secondary air ducts (22) are constricted to increase the air outlet speed.

7. The biomass pulverized coal co-firing boiler according to claim 1, wherein The boiler main body (1) is a cube, and the burners (2) are arranged at the top corners of the boiler main body (1).

8. The biomass pulverized coal co-firing boiler according to claim 7, wherein The outlet of the burner (2) faces the axis of the boiler main body (1), and The outlet direction of the burner (2) forms an angle with the diagonal of the cross-section of the boiler main body (1), and the angle is 3.25° - 4.25°.

9. The biomass pulverized coal co-firing boiler according to claim 8, wherein Air inlet pipes (11) are arranged on both sides of the boiler main body (1), and the air inlet pipes (11) are connected to the burners (2) on the same side.

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