Dust reduction and efficiency improvement device for waste incineration boiler

Abstract

The utility model belongs to the field of waste incineration power generation, and relates to a dust reduction and synergy device for a waste incineration boiler, which comprises two dust reduction and synergy device bodies respectively arranged on two sides of a flue outlet of a waste heat boiler, and a coal economizer communicated with the two dust reduction and synergy device bodies, the waste heat boiler flue comprises a first flue, a second flue and a third flue which are sequentially communicated with the waste heat boiler, and air inlets of the two dust reduction and efficiency improvement device bodies are respectively communicated with the third flue through a fourth flue; the economizer is communicated with the two dust reduction and efficiency improvement device bodies through connecting pipelines, and the tail end is connected with a flue gas purification system. According to the utility model, the dust content of the flue gas at the outlet of the waste incineration boiler is reduced, the fly ash yield is reduced from the source, the fly ash disposal cost is further reduced, and the land landfill pressure is relieved; the economizer heat exchange efficiency is improved; the deacidification efficiency and the service life of a cloth bag are improved, and the resistance of a flue gas purification system is reduced; and the flue gas pollutant emission level of the waste incineration plant is improved.

Description

Technical Field

[0001] The utility model belongs to the field of garbage incineration power generation and relates to a dust reduction and efficiency-enhancing device for a garbage incineration boiler. Background Art

[0002] Waste incineration has become the mainstream technology for domestic waste treatment in my country due to its advantages of volume reduction, resource utilization and high degree of harmlessness. At present, a large amount of fly ash is produced during the waste incineration process. Fly ash is identified as hazardous waste (HW18) because it contains a large amount of pollutants such as dioxins and heavy metals. If it is not properly disposed, it will pose a threat to the environment and human health. With the vigorous promotion of waste incineration technology, the proper disposal of fly ash has become a bottleneck problem restricting the development of the industry.

[0003] The current solution to fly ash is to "dispose of it after it is generated". Landfilling fly ash in hazardous waste landfills or landfilling fly ash in domestic waste after solidification / stabilization is a relatively common fly ash treatment solution in China. In recent years, the output of domestic waste has increased year by year, and the amount of fly ash generated by incineration will become higher and higher. However, the number and storage capacity of hazardous waste landfills are limited, the operating costs are high, and the storage capacity of domestic waste landfills is also becoming increasingly tight.

[0004] Based on the above analysis, reducing the amount of fly ash at the source is a difficult problem that needs to be solved urgently in the current municipal solid waste incineration industry. It is possible to consider using dust reduction and efficiency improvement devices in waste incineration waste heat boilers to reduce fly ash production from the source.

[0005] At present, relevant research on fly ash mainly focuses on the harmless and resource-based disposal technology after the fly ash is produced. There are relatively few studies on reducing fly ash at the source. The current research status of fly ash is characterized by focusing on back-end processing and disposal, but neglecting source reduction.

[0006] (A) Research on fly ash treatment and disposal technology

[0007] At present, the overall fly ash treatment and disposal technology is deeply tied to external factors such as the storage capacity of hazardous waste landfills, the storage capacity of domestic waste landfills, and the prosperity of the cement industry, and is not universal. At the same time, there are also problems such as high investment and operating costs, unstable operation, and large-scale application of resource-based products requires a lot of policy guidance and support.

[0008] The current fly ash disposal technology mainly focuses on solidification / stabilization landfill, supplemented by fly ash water washing coupled with cement kiln coordinated disposal. It also includes high-temperature melting, water washing, salt separation and resource utilization, which have not yet been widely used. However, the above technologies are all disposal methods for fly ash after it is generated, and there are certain limitations in the application process.

[0009] The existing domestic waste landfills are mainly used as emergency facilities for harmless waste treatment. Therefore, the fly ash landfill capacity of domestic waste landfills is very tight, and the problem of fly ash disposal needs to be solved urgently.

[0010] In addition, the proportion of fly ash co-disposed by cement kilns is relatively small, the cement industry's production capacity fluctuates greatly, and the technology's ability to dispose of fly ash is relatively limited. High-temperature melting technology has the advantages of good volume reduction effect, good solidification effect, effective reduction of heavy metal leaching toxicity and full decomposition of dioxins, and has great application prospects, but its large-scale application is limited by problems such as high equipment energy consumption, difficulty in flue gas treatment, and the generation of secondary fly ash. Fly ash washing and salt separation resource technology can achieve the harmless and resource utilization of waste incineration fly ash, but it is still in the pilot stage, and industrial application still requires in-depth research and development.

[0011] (B) Research on fly ash source reduction technology

[0012] According to the 3R principle of waste treatment (Reduce, Reuse, Recycle), source reduction is the best strategy for fly ash treatment. However, at present, there are few studies on fly ash source reduction technology at home and abroad. It is mainly achieved through the refined management of flue gas purification system consumables such as slaked lime. The reduction means are relatively single and the effect is limited. It is more of a correction to the previous extensive management of the project. Therefore, it is urgent to carry out in-depth research on fly ash source reduction technology to fill the current technical gaps in the industry and enhance core competitiveness. Utility Model Content

[0013] In view of this, the purpose of the utility model is to provide a dust reduction and efficiency improvement device for a waste incineration boiler, to innovate and study the dust reduction and efficiency improvement device for the waste incineration boiler, to reduce the fly ash production from the source, to improve the heat exchange efficiency of the economizer, to improve the flue gas deacidification efficiency and the service life of the bag, and to improve the flue gas pollutant emission level of the waste incineration plant.

[0014] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a dust reduction and efficiency improvement device for a waste incineration boiler, comprising two dust reduction and efficiency improvement device bodies respectively arranged on both sides of the flue outlet of a waste heat boiler, and an economizer connected to the two dust reduction and efficiency improvement device bodies; the flue of the waste heat boiler comprises a first flue, a second flue and a third flue which are sequentially connected to the waste heat boiler, and the air inlets of the two dust reduction and efficiency improvement device bodies are respectively connected to the third flue through a fourth flue; the economizer is connected to the two dust reduction and efficiency improvement device bodies through a connecting pipe, and the end of the economizer is connected to the flue gas purification system.

[0015] Optionally, the center line of the economizer coincides with the center line of the flue of the waste heat boiler and is separated from the third flue by a baffle.

[0016] Optionally, a partition is arranged on the center line of the fourth flue.

[0017] Optionally, the air outlet of the dust reduction and efficiency enhancement device body is arranged at the top and is connected to the connecting pipe.

[0018] Optionally, an ash storage hopper is provided below the main body of the dust reduction and efficiency enhancement device.

[0019] Optionally, the two dust reduction and efficiency enhancement device bodies are symmetrically arranged along the center line of the economizer.

[0020] The beneficial effects of the utility model are as follows: the utility model innovatively studies a new type of dust reduction and efficiency-enhancing device for waste incineration boilers, which reduces the dust content of the flue gas at the outlet of the waste incineration boiler, reduces the fly ash production from the source, thereby reducing the fly ash disposal cost and alleviating the pressure on landfill; improves the heat exchange efficiency of the economizer; improves the deacidification efficiency and bag life, reduces the resistance of the flue gas purification system; and improves the emission level of flue gas pollutants from the waste incineration plant.

[0021] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0023] Figure 1 This is the overall installation layout diagram of the utility model;

[0024] Figure 2 It is a schematic diagram of the main body of the dust reduction and efficiency enhancement device of the utility model.

[0025] Figure numerals: first flue 1, second flue 2, third flue 3, fourth flue 4, dust reduction and efficiency improvement device body 5, economizer 6, connecting pipe 7, air inlet 8, ash storage hopper 9. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0027] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] See also Figure 1-2 , is a dust reduction and efficiency-enhancing device for a waste incineration boiler, comprising two dust reduction and efficiency-enhancing device bodies 5 respectively arranged on both sides of the flue outlet of the waste heat boiler, and an economizer 6 connected to the two dust reduction and efficiency-enhancing device bodies 5; the flue of the waste heat boiler comprises a first flue 1, a second flue 2 and a third flue 3 which are sequentially connected to the waste heat boiler, and the air inlets 8 of the two dust reduction and efficiency-enhancing device bodies 5 are respectively connected to the third flue 3 through the fourth flue 4; the economizer 6 is connected to the two dust reduction and efficiency-enhancing device bodies 5 through a connecting pipe 7, and the end of the economizer 6 is connected to the flue gas purification system, the center line of the economizer 6 coincides with the center line of the flue of the waste heat boiler, and is separated from the third flue 3 by a baffle, and a baffle is arranged on the center line of the fourth flue 4, the air outlet of the dust reduction and efficiency-enhancing device body 5 is arranged at the top and connected to the connecting pipe 7, an ash storage hopper 9 is arranged below the dust reduction and efficiency-enhancing device body 5, and the two dust reduction and efficiency-enhancing device bodies 5 are symmetrically arranged along the center line of the economizer 6.

[0030] When the utility model is in use, the dust reduction and efficiency-enhancing devices on both sides of the flue at the three flue outlets of the waste heat boiler respectively extract half of the flue gas, and a partition is arranged in the middle of the flue to separate the dust with large particle size and low pollutant content in the flue gas into slag. After the dust is separated, the flue gas returns to the inlet of the economizer 6 and enters the flue gas purification system through the economizer 6.

[0031] The utility model realizes the arrangement of cyclone dust collector by optimizing boiler design and arrangement of boiler soot blower; realizes full pre-dust removal of waste incineration flue gas and reduces fly ash source by setting two dust reduction and efficiency-enhancing devices; reduces dust content in flue gas, improves heat exchange efficiency of economizer 6, improves flue gas deacidification efficiency and bag life, and thus improves the emission level of flue gas pollutants of waste incineration plants (reduced emissions of dust and acid gases).

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A dust reduction and efficiency enhancement device for a waste incineration boiler, characterized in that: It includes two dust reduction and efficiency-enhancing device bodies respectively arranged on both sides of the flue outlet of the waste heat boiler, and an economizer connected to the two dust reduction and efficiency-enhancing device bodies; The flue of the waste heat boiler includes a first flue, a second flue and a third flue which are sequentially connected to the waste heat boiler, and the air inlets of the two dust reduction and efficiency enhancement device bodies are respectively connected to the third flue through the fourth flue; The economizer is connected to the two dust reduction and efficiency-enhancing device bodies through connecting pipes, and the end of the economizer is connected to the flue gas purification system.

2. The dust reduction and efficiency improvement device for a waste incineration boiler according to claim 1 is characterized in that: The center line of the economizer coincides with the center line of the waste heat boiler flue, and is separated from the third flue by a baffle.

3. The dust reduction and efficiency-enhancing device for a waste incineration boiler according to claim 1 is characterized in that: A partition is arranged on the center line of the fourth flue.

4. The dust reduction and efficiency improvement device for a waste incineration boiler according to claim 1 is characterized in that: The air outlet of the dust reduction and efficiency enhancement device body is arranged at the top and is connected with the connecting pipe.

5. The dust reduction and efficiency improvement device for a waste incineration boiler according to claim 1 is characterized in that: An ash storage hopper is arranged below the main body of the dust reduction and efficiency enhancement device.

6. The dust reduction and efficiency-enhancing device for a waste incineration boiler according to claim 1 is characterized in that: The two dust reduction and efficiency enhancement device bodies are symmetrically arranged along the center line of the economizer.

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