A garbage incineration flue gas dry treatment mixer

Abstract

The application discloses a garbage incineration flue gas dry treatment mixer, and belongs to the technical field of garbage incineration flue gas treatment. The garbage incineration flue gas dry treatment mixer comprises a pipeline body, a slaked lime injection pipe and an activated carbon injection pipe which are arranged on the pipeline body and are in communication with the pipeline body, the pipeline body is in a U-shaped structure, is composed of an inlet straight section, an inlet curved section, a necked section, a turning section, an outlet straight section and an outlet curved section which are sequentially connected, the necked section is in a conical shape, a large end of the necked section faces the inlet curved section, and a matured fly ash feeder which is in communication with the turning section is arranged above the turning section. The mixer can form high-speed turbulent flow in the pipeline body, so that the flue gas and the reaction agent in the pipeline body can be fully mixed. Meanwhile, the mixer is provided with a fly ash recirculation system, so that the utilization efficiency of the slaked lime and the activated carbon can be effectively improved, and the fly ash yield of the system can be reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of waste incineration flue gas treatment, and particularly relates to a waste incineration flue gas dry treatment mixer. BACKGROUND

[0002] The problem of municipal waste has increasingly become one of the important problems that plague the development of cities in the world. Waste incineration treatment technology conforms to the waste treatment policy of harmlessness, reduction and resource utilization, and has the advantages of fast treatment speed, good volume reduction effect, small land occupation and small environmental impact, and has developed rapidly at home and abroad in recent years. However, after incineration of domestic waste, flue gas containing heavy metals, dioxins, SO2, NOx, HCl, HF and other toxic and harmful substances is generated, which will cause harm to the environment if not effectively treated. Therefore, the waste incineration flue gas treatment technology and process have become a hot spot of current research and development.

[0003] Current domestic waste incineration plants usually adopt semi-dry, dry and wet processes and systems to treat domestic waste incineration flue gas, so as to reduce the influence of harmful substances such as smoke dust, sulfur oxides, nitrogen oxides, dioxins and heavy metals in the incineration flue gas on the environment. Among them, the dry process is to spray lime, activated carbon powder into the dry process reactor to carry out chemical deacidification and adsorption reaction with the flue gas, remove toxic substances and dust through a bag reactor, and discharge the purified flue gas through a chimney. The current dry process reactor has the following problems: first, the dry process mixer is a conventional design structure with a basically unchanged cross-sectional area, which leads to little change in the flow rate in the mixer, and the mixed flue gas, lime and activated carbon powder cannot form turbulent flow with strong disturbance, which is not conducive to full mixing and reaction, so that the reaction efficiency of the sprayed lime and activated carbon powder with the flue gas is low, and the reaction is not sufficient. If a better reaction effect is to be obtained, more lime and activated carbon powder need to be invested; second, the fly ash generated in the dry process contains a large amount of unreacted lime and activated carbon, and the direct discharge of the fly ash causes resource waste; third, the reaction efficiency in the dry process mixer is low, and the reacted fly ash is not recycled, which leads to a large amount of fly ash generated in the dry process, and the fly ash cannot be effectively treated and disposed, which will cause harm to the environment. In view of the above problems, it is necessary to improve the existing dry process technology and equipment, improve the flue gas purification efficiency, and reduce the operation cost. SUMMARY

[0004] In view of this, the purpose of the present application is to provide a waste incineration flue gas dry treatment mixer, so that turbulent flow with high speed disturbance is formed in the mixer, and the problem of full mixing of flue gas and reaction agent in the mixer is solved. At the same time, the present application also sprays the fly ash that has been matured and reactivated back to the dry process mixer, improves the utilization efficiency of lime and activated carbon, and reduces the fly ash production.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] This invention provides a dry treatment mixer for waste incineration flue gas, comprising a pipe body and a quicklime injection pipe and an activated carbon injection pipe disposed on and connected to the pipe body. The pipe body has a U-shaped structure and consists of a straight inlet section, an inlet bend section, a necking section, a turning section, a straight outlet section, and an outlet bend section connected in sequence. The necking section is conical, with its wide end facing the inlet bend section. A slaked fly ash feeder is disposed above the turning section and connected to it.

[0007] Furthermore, the cross-sections of the inlet straight section, inlet bend section, necking section, outlet straight section, and outlet bend section are all square; the turning section is boat-shaped; and the inlet bend section and outlet bend section are 90-degree bends.

[0008] Furthermore, the height of the constricted section is 1 / 2 to 1 / 3 of the height of the straight section at the outlet.

[0009] Furthermore, the horizontal center axis of the straight section at the entrance is not higher than the horizontal center axis of the curved section at the exit.

[0010] Furthermore, the quicklime injection pipe is located on the inlet bend and is perpendicular to the large end of the constricted section near the inside of the inlet bend, and the activated carbon injection pipe is located on the inlet bend and is parallel to the quicklime injection pipe, perpendicular to the large end of the constricted section.

[0011] Furthermore, the bottom of the steering section is mounted on the base via a support seat, and an air vibrator is also provided at its bottom, with a manhole on its side.

[0012] Furthermore, an inspection hole is provided on the inner side of the entrance bend.

[0013] Furthermore, the fly ash in the aging fly ash feeder is aging and reactivated fly ash, and it is connected to the feeder via a screw conveyor.

[0014] Furthermore, the fermented and reactivated fly ash comes from the fly ash under the bag filter and is fermented and reactivated through the fermentation chamber.

[0015] The beneficial effects of this invention are as follows: This invention designs the reactor cross-sectional area and the length of each reaction section by controlling the flue gas velocity and the content of acidic gases in the flue gas. This ensures thorough mixing of the flue gas, slaked lime, and activated carbon powder within the mixer, forming a high-speed, turbulent fluid to improve the mixer's purification efficiency. Simultaneously, the addition of a fly ash recirculation system to the mixer, which reactivates and re-sprays the slaked fly ash from the bag filter, effectively improves the reactant utilization efficiency and reduces the system's fly ash production.

[0016] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of the mixer;

[0019] Attached reference numerals: 1. Inlet straight section; 2. Inlet curved section; 3. Quicklime injection pipe; 4. Activated carbon injection pipe; 5. Inspection hole; 6. Neck section; 7. Air vibrator; 8. Support seat; 9. Manhole; 10. Base; 11. Turning section; 12. Outlet straight section; 13. Outlet curved section; 14. Quicklime fly ash feeder. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0021] like Figure 1 As shown, the dry treatment mixer for waste incineration flue gas in this embodiment includes a pipe body and a quicklime injection pipe 3 and an activated carbon injection pipe 4 installed on and connected to the pipe body. The pipe body has a U-shaped structure and consists of an inlet straight section 1, an inlet bend section 2, a necking section 6, a turning section 11, an outlet straight section 12, and an outlet bend section 13 connected in sequence. The necking section 6 is conical, which improves the mixing effect of the pipe body. Its large end faces the inlet bend section 2. A slaked fly ash feeder 14 is provided above the turning section 11 and communicates with it. The quicklime injection pipe 3 is installed on the inlet bend section 2 and is close to the inside of the inlet bend section 2, perpendicular to the large end of the necking section 6. The activated carbon injection pipe 4 is installed on the inlet bend section 2 and is parallel to the quicklime injection pipe 3, perpendicular to the large end of the necking section 6.

[0022] Specifically, the inlet straight section of the mixer's duct body is connected to the atomizing tower to receive the flue gas after spray reaction, and its outlet bend section is connected to the belt dust collector to remove fly ash from the flue gas. That is, the flue gas from the atomizing tower outlet is sent into the mixer, which is mainly a U-shaped square tube. The flow process inside the mixer is numerically simulated based on the actual flue gas velocity to obtain the optimal cross-sectional dimensions and bending radii of each section of the duct body. This allows the flue gas and reactant inside the mixer to be fully mixed and form a high-speed turbulent fluid through the duct body structure. It also ensures that the temperature difference between the inlet straight section and the outlet bend section is within 2 degrees Celsius. Subsequently, the flue gas enters the bag dust collector to remove fly ash and unreacted reactant from the flue gas.

[0023] In this embodiment, the cross-sections of the inlet straight section 1, inlet bend section 2, necking section 6, outlet straight section 12, and outlet bend section 13 are all square; the turning section 11 is boat-shaped; and the inlet bend section 2 and outlet bend section 13 are 90-degree bends. Thus, the square tube is easy to process, has good comprehensive mechanical properties, good weldability, good cold / hot working performance and corrosion resistance, and also possesses good toughness.

[0024] In this embodiment, the height of the constricted section 6 is 1 / 2 to 1 / 3 of the height of the outlet straight section 12, and the specific parameters can be determined by the reaction conditions; the pipe diameter of the outlet straight section 12 is less than or equal to the pipe diameter of the small opening of the constricted section 6; the horizontal center axis of the inlet straight section 1 is lower than the horizontal center axis of the outlet bend 13. All of these measures can improve the thorough mixing effect of flue gas and reactant within the pipeline body.

[0025] In this embodiment, the reactants in the quicklime injection pipe 3 and the activated carbon injection pipe 4 are quicklime and activated carbon, respectively. In different embodiments, the quicklime injection pipe 3 and the activated carbon injection pipe 4 can also be combined into one pipe and connected to the inlet bend 2. The fly ash in the slaked fly ash feeder 14 is the slaked and reactivated fly ash. Quicklime and activated carbon are pneumatically conveyed (using compressed air) into the mixer, and the slaked and reactivated fly ash (including unreacted powdered quicklime, activated carbon powder, and fly ash) is fed into the mixer by a screw conveyor.

[0026] In this embodiment, the bottom of the turning section 11 is mounted on the base 10 via a support seat 8. An air vibrator 7 is also provided at the bottom of the section, which is used to prevent pipe blockage. A manhole 9 is provided on the side of the section, which is used for pipe maintenance and unblocking.

[0027] In this embodiment, an inspection hole 5 is provided on the inner side of the inlet bend 2. The inspection hole is used to observe the operating status inside the mixer.

[0028] Finally, 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 limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A dry treatment mixer for waste incineration flue gas, comprising a pipe body and a quicklime injection pipe (3) and an activated carbon injection pipe (4) disposed on and connected to the pipe body, characterized in that, The pipeline body has a U-shaped structure and consists of an inlet straight section (1), an inlet bend (2), a necking section (6), a turning section (11), an outlet straight section (12), and an outlet bend (13) connected in sequence. The necking section is conical, with its large end facing the inlet bend. A slaked fly ash feeder (14) connected to the turning section is provided above it. The slaked lime injection pipe is located on the inlet bend and close to the inside of the inlet bend, perpendicular to the large end of the necking section. The activated carbon injection pipe is located on the inlet bend and parallel to the slaked lime injection pipe, perpendicular to the large end of the necking section.

2. The dry treatment mixer for waste incineration flue gas according to claim 1, characterized in that, The cross-sections of the inlet straight section, inlet bend section, necking section, outlet straight section, and outlet bend section are all square; the turning section is boat-shaped; and the inlet bend section and outlet bend section are 90-degree bends.

3. The dry treatment mixer for waste incineration flue gas according to claim 1, characterized in that, The height of the constricted section is 1 / 2 to 1 / 3 of the height of the straight section at the outlet.

4. The dry treatment mixer for waste incineration flue gas according to claim 1, characterized in that, The horizontal center axis of the straight section at the entrance is not higher than the horizontal center axis of the curved section at the exit.

5. The dry treatment mixer for waste incineration flue gas according to claim 1, characterized in that, The bottom of the steering section is mounted on the base (10) via a support (8), and an air vibrator (7) is also provided at its bottom, with a manhole (9) on its side.

6. The dry treatment mixer for waste incineration flue gas according to claim 5, characterized in that, The inner side of the inlet bend is provided with an inspection hole (5).

7. The dry treatment mixer for waste incineration flue gas according to claim 6, characterized in that, The fly ash in the aging fly ash feeder is aging and reactivated fly ash, and it is connected to the feeder via a screw conveyor.

8. The dry treatment mixer for waste incineration flue gas according to claim 7, characterized in that, The fermented and reactivated fly ash comes from the fly ash under the bag filter and is fermented and reactivated through the fermentation chamber.

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